diff --git a/package-lock.json b/package-lock.json
index bae237168..84ffcfb99 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,6 +17,7 @@
         "array-unflat-js": "^0.1.3",
         "boxen": "^7.0.1",
         "chalk": "^5.2.0",
+        "desm": "^1.3.0",
         "execa": "^6.1.0",
         "fs-extra": "^11.1.0",
         "is-wsl": "^2.2.0",
@@ -40,12 +41,12 @@
         "archiver": "^5.3.1",
         "eslint": "^8.31.0",
         "eslint-config-airbnb-base": "^15.0.0",
-        "eslint-config-prettier": "^8.5.0",
+        "eslint-config-prettier": "^8.6.0",
         "eslint-plugin-import": "^2.25.4",
         "eslint-plugin-prettier": "^4.2.1",
         "eslint-plugin-unicorn": "^45.0.2",
         "git-list-updated": "^1.2.1",
-        "husky": "^8.0.2",
+        "husky": "^8.0.3",
         "lint-staged": "^13.1.0",
         "mocha": "^10.2.0",
         "nyc": "^15.1.0",
@@ -2508,9 +2509,9 @@
       }
     },
     "node_modules/ajv-formats/node_modules/ajv": {
-      "version": "8.11.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.11.2.tgz",
-      "integrity": "sha512-E4bfmKAhGiSTvMfL1Myyycaub+cUEU2/IvpylXkUu7CHBkBj1f/ikdzbD7YQ6FKUbixDxeYvB/xY4fvyroDlQg==",
+      "version": "8.12.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.12.0.tgz",
+      "integrity": "sha512-sRu1kpcO9yLtYxBKvqfTeh9KzZEwO3STyX1HT+4CaDzC6HpTGYhIhPIzj9XuKU7KYDwnaeh5hcOwjy1QuJzBPA==",
       "dev": true,
       "dependencies": {
         "fast-deep-equal": "^3.1.1",
@@ -2862,9 +2863,9 @@
       }
     },
     "node_modules/aws-sdk": {
-      "version": "2.1286.0",
-      "resolved": "https://registry.npmjs.org/aws-sdk/-/aws-sdk-2.1286.0.tgz",
-      "integrity": "sha512-CvkCD1+NSk2MPOutD2hEPhXDET/79w/gd9a359QWb9Ja0Fd4vVFXPkhlm1DTGzuwqFKGinpCMxDP4md7QPsVvw==",
+      "version": "2.1287.0",
+      "resolved": "https://registry.npmjs.org/aws-sdk/-/aws-sdk-2.1287.0.tgz",
+      "integrity": "sha512-mtfDstUdFNn8FnBaXs2KAaQ0cgDIiwlqwC2UptUKWWrugjZHAoRacfD/6bnah1Kwhu43F9CDEe5QLHnQtymNkw==",
       "dev": true,
       "dependencies": {
         "buffer": "4.9.2",
@@ -3451,9 +3452,15 @@
       }
     },
     "node_modules/ci-info": {
-      "version": "3.7.0",
-      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-3.7.0.tgz",
-      "integrity": "sha512-2CpRNYmImPx+RXKLq6jko/L07phmS9I02TyqkcNU20GCF/GgaWvc58hPtjxDX8lPpkdwc9sNh72V9k00S7ezog==",
+      "version": "3.7.1",
+      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-3.7.1.tgz",
+      "integrity": "sha512-4jYS4MOAaCIStSRwiuxc4B8MYhIe676yO1sYGzARnjXkWpmzZMMYxY6zu8WYWDhSuth5zhrQ1rhNSibyyvv4/w==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/sibiraj-s"
+        }
+      ],
       "engines": {
         "node": ">=8"
       }
@@ -4759,6 +4766,11 @@
         "node": ">=0.4.0"
       }
     },
+    "node_modules/desm": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/desm/-/desm-1.3.0.tgz",
+      "integrity": "sha512-RvlHN2gfYA0BpCfjpWzCdQeR6p5U+84f5DzcirLow86UA/OcpwuOqXRC4Oz0bG9rzcJPVtMT6ZgNtjp4qh+uqA=="
+    },
     "node_modules/detect-indent": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/detect-indent/-/detect-indent-6.1.0.tgz",
@@ -5177,9 +5189,9 @@
       }
     },
     "node_modules/eslint-config-prettier": {
-      "version": "8.5.0",
-      "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-8.5.0.tgz",
-      "integrity": "sha512-obmWKLUNCnhtQRKc+tmnYuQl0pFU1ibYJQ5BGhTVB08bHe9wC8qUeG7c08dj9XX+AuPj1YSGSQIHl1pnDHZR0Q==",
+      "version": "8.6.0",
+      "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-8.6.0.tgz",
+      "integrity": "sha512-bAF0eLpLVqP5oEVUFKpMA+NnRFICwn9X8B5jrR9FcqnYBuPbqWEjTEspPWMj5ye6czoSLDweCzSo3Ko7gGrZaA==",
       "dev": true,
       "bin": {
         "eslint-config-prettier": "bin/cli.js"
@@ -6845,9 +6857,9 @@
       }
     },
     "node_modules/husky": {
-      "version": "8.0.2",
-      "resolved": "https://registry.npmjs.org/husky/-/husky-8.0.2.tgz",
-      "integrity": "sha512-Tkv80jtvbnkK3mYWxPZePGFpQ/tT3HNSs/sasF9P2YfkMezDl3ON37YN6jUUI4eTg5LcyVynlb6r4eyvOmspvg==",
+      "version": "8.0.3",
+      "resolved": "https://registry.npmjs.org/husky/-/husky-8.0.3.tgz",
+      "integrity": "sha512-+dQSyqPh4x1hlO1swXBiNb2HzTDN1I2IGLQx1GrBuiqFJfoMrnZWwVmatvSiO+Iz8fBUnf+lekwNo4c2LlXItg==",
       "dev": true,
       "bin": {
         "husky": "lib/bin.js"
@@ -10822,9 +10834,9 @@
       }
     },
     "node_modules/serverless/node_modules/ajv": {
-      "version": "8.11.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.11.2.tgz",
-      "integrity": "sha512-E4bfmKAhGiSTvMfL1Myyycaub+cUEU2/IvpylXkUu7CHBkBj1f/ikdzbD7YQ6FKUbixDxeYvB/xY4fvyroDlQg==",
+      "version": "8.12.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.12.0.tgz",
+      "integrity": "sha512-sRu1kpcO9yLtYxBKvqfTeh9KzZEwO3STyX1HT+4CaDzC6HpTGYhIhPIzj9XuKU7KYDwnaeh5hcOwjy1QuJzBPA==",
       "dev": true,
       "dependencies": {
         "fast-deep-equal": "^3.1.1",
diff --git a/package.json b/package.json
index 901037fca..4359a4487 100644
--- a/package.json
+++ b/package.json
@@ -86,6 +86,7 @@
     "array-unflat-js": "^0.1.3",
     "boxen": "^7.0.1",
     "chalk": "^5.2.0",
+    "desm": "^1.3.0",
     "execa": "^6.1.0",
     "fs-extra": "^11.1.0",
     "is-wsl": "^2.2.0",
@@ -109,12 +110,12 @@
     "archiver": "^5.3.1",
     "eslint": "^8.31.0",
     "eslint-config-airbnb-base": "^15.0.0",
-    "eslint-config-prettier": "^8.5.0",
+    "eslint-config-prettier": "^8.6.0",
     "eslint-plugin-import": "^2.25.4",
     "eslint-plugin-prettier": "^4.2.1",
     "eslint-plugin-unicorn": "^45.0.2",
     "git-list-updated": "^1.2.1",
-    "husky": "^8.0.2",
+    "husky": "^8.0.3",
     "lint-staged": "^13.1.0",
     "mocha": "^10.2.0",
     "nyc": "^15.1.0",
diff --git a/src/events/http/Endpoint.js b/src/events/http/Endpoint.js
index be572286f..3b82bb576 100644
--- a/src/events/http/Endpoint.js
+++ b/src/events/http/Endpoint.js
@@ -1,20 +1,17 @@
 import { existsSync, readFileSync } from 'node:fs'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
 import { log } from '@serverless/utils/log.js'
+import { join } from 'desm'
 import OfflineEndpoint from './OfflineEndpoint.js'
 
 const { entries } = Object
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 // velocity template defaults
 const defaultRequestTemplate = readFileSync(
-  resolve(__dirname, 'templates/offline-default.req.vm'),
+  join(import.meta.url, 'templates/offline-default.req.vm'),
   'utf8',
 )
 const defaultResponseTemplate = readFileSync(
-  resolve(__dirname, 'templates/offline-default.res.vm'),
+  join(import.meta.url, 'templates/offline-default.res.vm'),
   'utf8',
 )
 
diff --git a/src/lambda/__tests__/LambdaFunction.test.js b/src/lambda/__tests__/LambdaFunction.test.js
index e59570272..a3d45a793 100644
--- a/src/lambda/__tests__/LambdaFunction.test.js
+++ b/src/lambda/__tests__/LambdaFunction.test.js
@@ -1,19 +1,16 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 // import { performance } from 'node:perf_hooks'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import LambdaFunction from '../LambdaFunction.js'
 import { DEFAULT_LAMBDA_TIMEOUT } from '../../config/index.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('LambdaFunction', () => {
   const functionName = 'foo'
 
   const serverless = {
     config: {
       serverlessPath: '',
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     },
     service: {
       provider: {
diff --git a/src/lambda/handler-runner/python-runner/PythonRunner.js b/src/lambda/handler-runner/python-runner/PythonRunner.js
index 3cfae5566..c0cf288b4 100644
--- a/src/lambda/handler-runner/python-runner/PythonRunner.js
+++ b/src/lambda/handler-runner/python-runner/PythonRunner.js
@@ -1,17 +1,15 @@
 import { spawn } from 'node:child_process'
 import { EOL, platform } from 'node:os'
-import { delimiter, dirname, join, relative, resolve } from 'node:path'
+import { delimiter, join as pathJoin, relative } from 'node:path'
 import process, { cwd, nextTick } from 'node:process'
 import { createInterface } from 'node:readline'
-import { fileURLToPath } from 'node:url'
 import { log } from '@serverless/utils/log.js'
+import { join } from 'desm'
 import { splitHandlerPathAndName } from '../../../utils/index.js'
 
 const { parse, stringify } = JSON
 const { assign, hasOwn } = Object
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 export default class PythonRunner {
   static #payloadIdentifier = '__offline_payload__'
 
@@ -32,7 +30,7 @@ export default class PythonRunner {
       const runtimeDir = platform() === 'win32' ? 'Scripts' : 'bin'
 
       process.env.PATH = [
-        join(process.env.VIRTUAL_ENV, runtimeDir),
+        pathJoin(process.env.VIRTUAL_ENV, runtimeDir),
         delimiter,
         process.env.PATH,
       ].join('')
@@ -44,7 +42,7 @@ export default class PythonRunner {
       pythonExecutable,
       [
         '-u',
-        resolve(__dirname, 'invoke.py'),
+        join(import.meta.url, 'invoke.py'),
         relative(cwd(), handlerPath),
         handlerName,
       ],
diff --git a/src/lambda/handler-runner/ruby-runner/RubyRunner.js b/src/lambda/handler-runner/ruby-runner/RubyRunner.js
index 3d2902c9b..0db1298de 100644
--- a/src/lambda/handler-runner/ruby-runner/RubyRunner.js
+++ b/src/lambda/handler-runner/ruby-runner/RubyRunner.js
@@ -1,16 +1,14 @@
 import { EOL, platform } from 'node:os'
-import { dirname, relative, resolve } from 'node:path'
+import { relative } from 'node:path'
 import { cwd } from 'node:process'
-import { fileURLToPath } from 'node:url'
 import { log } from '@serverless/utils/log.js'
+import { join } from 'desm'
 import { execa } from 'execa'
 import { splitHandlerPathAndName } from '../../../utils/index.js'
 
 const { parse, stringify } = JSON
 const { hasOwn } = Object
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 export default class RubyRunner {
   static #payloadIdentifier = '__offline_payload__'
 
@@ -86,7 +84,7 @@ export default class RubyRunner {
     const { stderr, stdout } = await execa(
       runtime,
       [
-        resolve(__dirname, 'invoke.rb'),
+        join(import.meta.url, 'invoke.rb'),
         relative(cwd(), this.#handlerPath),
         this.#handlerName,
       ],
diff --git a/src/lambda/handler-runner/worker-thread-runner/WorkerThreadRunner.js b/src/lambda/handler-runner/worker-thread-runner/WorkerThreadRunner.js
index 4d3910cea..9e3aed51d 100644
--- a/src/lambda/handler-runner/worker-thread-runner/WorkerThreadRunner.js
+++ b/src/lambda/handler-runner/worker-thread-runner/WorkerThreadRunner.js
@@ -1,9 +1,5 @@
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
 import { MessageChannel, Worker } from 'node:worker_threads'
-
-const __dirname = dirname(fileURLToPath(import.meta.url))
-const workerThreadHelperPath = resolve(__dirname, 'workerThreadHelper.js')
+import { join } from 'desm'
 
 export default class WorkerThreadRunner {
   #workerThread = null
@@ -11,17 +7,20 @@ export default class WorkerThreadRunner {
   constructor(funOptions, env) {
     const { codeDir, functionKey, handler, servicePath, timeout } = funOptions
 
-    this.#workerThread = new Worker(workerThreadHelperPath, {
-      // don't pass process.env from the main process!
-      env,
-      workerData: {
-        codeDir,
-        functionKey,
-        handler,
-        servicePath,
-        timeout,
+    this.#workerThread = new Worker(
+      join(import.meta.url, 'workerThreadHelper.js'),
+      {
+        // don't pass process.env from the main process!
+        env,
+        workerData: {
+          codeDir,
+          functionKey,
+          handler,
+          servicePath,
+          timeout,
+        },
       },
-    })
+    )
   }
 
   // () => Promise<number>
diff --git a/tests/_testHelpers/setupTeardown.js b/tests/_testHelpers/setupTeardown.js
index 63357b939..1844dd90a 100644
--- a/tests/_testHelpers/setupTeardown.js
+++ b/tests/_testHelpers/setupTeardown.js
@@ -1,14 +1,11 @@
-import { dirname, resolve } from 'node:path'
 import process, { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { execaNode } from 'execa'
 
 let serverlessProcess
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
-const serverlessPath = resolve(
-  __dirname,
+const serverlessPath = join(
+  import.meta.url,
   '../../node_modules/serverless/bin/serverless',
 )
 
diff --git a/tests/end-to-end/environmentVariables/environmentVariables.test.js b/tests/end-to-end/environmentVariables/environmentVariables.test.js
index 43112bb40..ab8aa8553 100644
--- a/tests/end-to-end/environmentVariables/environmentVariables.test.js
+++ b/tests/end-to-end/environmentVariables/environmentVariables.test.js
@@ -1,12 +1,9 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { BASE_URL } from '../../config.js'
 import { setup, teardown } from '../../_testHelpers/index.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('environment variables', function desc() {
   const ENV_VAR_QUOTED = 'I am ENV_VAR_1'
   const ENV_VAR_UNQUOTED = 'I am ENV_VAR_2'
@@ -20,7 +17,7 @@ describe('environment variables', function desc() {
     env.ENV_VAR_MAPPED_FROM_ANOTHER = ENV_VAR_MAPPED
 
     await setup({
-      servicePath: resolve(__dirname, 'src'),
+      servicePath: join(import.meta.url, 'src'),
     })
 
     const url = new URL('/dev/hello', BASE_URL)
diff --git a/tests/end-to-end/optionParameters/optionParameters.test.js b/tests/end-to-end/optionParameters/optionParameters.test.js
index d9f99a4c8..a64f8b4d1 100644
--- a/tests/end-to-end/optionParameters/optionParameters.test.js
+++ b/tests/end-to-end/optionParameters/optionParameters.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { BASE_URL } from '../../config.js'
 import { setup, teardown } from '../../_testHelpers/index.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('noPrependStageInUrl option', function desc() {
   beforeEach(() =>
     setup({
       args: ['--noPrependStageInUrl'],
-      servicePath: resolve(__dirname, 'src'),
+      servicePath: join(import.meta.url, 'src'),
     }),
   )
 
@@ -61,7 +58,7 @@ describe('prefix option', function desc() {
   beforeEach(() =>
     setup({
       args: ['--prefix', 'someprefix'],
-      servicePath: resolve(__dirname, 'src'),
+      servicePath: join(import.meta.url, 'src'),
     }),
   )
 
@@ -114,7 +111,7 @@ describe('noPrependStageInUrl option with prefix option', function desc() {
   beforeEach(() =>
     setup({
       args: ['--noPrependStageInUrl', '--prefix', 'someprefix'],
-      servicePath: resolve(__dirname, 'src'),
+      servicePath: join(import.meta.url, 'src'),
     }),
   )
 
diff --git a/tests/end-to-end/starRoutes/starRoutes.test.js b/tests/end-to-end/starRoutes/starRoutes.test.js
index 6c9112b10..7e9b1cae2 100644
--- a/tests/end-to-end/starRoutes/starRoutes.test.js
+++ b/tests/end-to-end/starRoutes/starRoutes.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { BASE_URL } from '../../config.js'
 import { setup, teardown } from '../../_testHelpers/index.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('star routes', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname, 'src'),
+      servicePath: join(import.meta.url, 'src'),
     }),
   )
 
diff --git a/tests/end-to-end/starRoutesRestApi/starRoutesRestApi.test.js b/tests/end-to-end/starRoutesRestApi/starRoutesRestApi.test.js
index f05ababd4..beee3e7c3 100644
--- a/tests/end-to-end/starRoutesRestApi/starRoutesRestApi.test.js
+++ b/tests/end-to-end/starRoutesRestApi/starRoutesRestApi.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { BASE_URL } from '../../config.js'
 import { setup, teardown } from '../../_testHelpers/index.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('star routes', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname, 'src'),
+      servicePath: join(import.meta.url, 'src'),
     }),
   )
 
diff --git a/tests/end-to-end/starRoutesWithProperties/starRoutes.test.js b/tests/end-to-end/starRoutesWithProperties/starRoutes.test.js
index e158b7501..25a6e3aaf 100644
--- a/tests/end-to-end/starRoutesWithProperties/starRoutes.test.js
+++ b/tests/end-to-end/starRoutesWithProperties/starRoutes.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { BASE_URL } from '../../config.js'
 import { setup, teardown } from '../../_testHelpers/index.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('star routes with properties', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname, 'src'),
+      servicePath: join(import.meta.url, 'src'),
     }),
   )
 
diff --git a/tests/events/http/private/generated-api-key/generated-api-key.test.js b/tests/events/http/private/generated-api-key/generated-api-key.test.js
index 3816b3e26..77a6d5e3d 100644
--- a/tests/events/http/private/generated-api-key/generated-api-key.test.js
+++ b/tests/events/http/private/generated-api-key/generated-api-key.test.js
@@ -1,11 +1,8 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('generated api key tests', function desc() {
   it('...', async () => {
     let stdoutData
@@ -24,7 +21,7 @@ describe('generated api key tests', function desc() {
     })
 
     await setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
       stdoutData,
     })
 
diff --git a/tests/events/http/private/provider-apiGateway-apiKeys/provider-apiGateway-apiKeys.test.js b/tests/events/http/private/provider-apiGateway-apiKeys/provider-apiGateway-apiKeys.test.js
index bd9401131..57ed7fcc1 100644
--- a/tests/events/http/private/provider-apiGateway-apiKeys/provider-apiGateway-apiKeys.test.js
+++ b/tests/events/http/private/provider-apiGateway-apiKeys/provider-apiGateway-apiKeys.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('provider.apiGateway.apiKeys tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/handler-module-formats/commonjs/handlerModuleFormats.test.js b/tests/handler-module-formats/commonjs/handlerModuleFormats.test.js
index 41935095d..4d456f91e 100644
--- a/tests/handler-module-formats/commonjs/handlerModuleFormats.test.js
+++ b/tests/handler-module-formats/commonjs/handlerModuleFormats.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('handler module format: commonjs', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/handler-module-formats/module/handlerModuleFormats.test.js b/tests/handler-module-formats/module/handlerModuleFormats.test.js
index 7ef0f31c3..fde76ee53 100644
--- a/tests/handler-module-formats/module/handlerModuleFormats.test.js
+++ b/tests/handler-module-formats/module/handlerModuleFormats.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('handler module format: module', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/alb-handler/handlerPayload.test.js b/tests/integration/alb-handler/handlerPayload.test.js
index 168ef110e..694a6de06 100644
--- a/tests/integration/alb-handler/handlerPayload.test.js
+++ b/tests/integration/alb-handler/handlerPayload.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('ALB handler payload tests', function desc() {
   beforeEach(() =>
     setup({
       noPrependStageInUrl: false,
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
@@ -178,7 +175,7 @@ describe('ALB handler payload tests with prepend off', function desc() {
   beforeEach(() =>
     setup({
       args: ['--noPrependStageInUrl'],
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/artifact/local/localArtifact.test.js b/tests/integration/artifact/local/localArtifact.test.js
index fe0e42e3b..641fd1c64 100644
--- a/tests/integration/artifact/local/localArtifact.test.js
+++ b/tests/integration/artifact/local/localArtifact.test.js
@@ -1,6 +1,5 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { BASE_URL } from '../../../config.js'
 import {
   compressArtifact,
@@ -8,23 +7,21 @@ import {
   teardown,
 } from '../../../_testHelpers/index.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Local artifact tests', function desc() {
   beforeEach(async () => {
     await Promise.all([
-      compressArtifact(__dirname, 'artifacts/hello1.zip', [
+      compressArtifact(join(import.meta.url), 'artifacts/hello1.zip', [
         'src/handler1.js',
         'src/package.json',
       ]),
-      compressArtifact(__dirname, 'artifacts/hello2.zip', [
+      compressArtifact(join(import.meta.url), 'artifacts/hello2.zip', [
         'src/handler2.js',
         'src/package.json',
       ]),
     ])
 
     await setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     })
   })
 
diff --git a/tests/integration/authorizer/authorizer.test.js b/tests/integration/authorizer/authorizer.test.js
index 077ae4308..c72928bb2 100644
--- a/tests/integration/authorizer/authorizer.test.js
+++ b/tests/integration/authorizer/authorizer.test.js
@@ -2,17 +2,14 @@
 // https://dev.to/piczmar_0/serverless-authorizers---custom-rest-authorizer-16
 
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { BASE_URL } from '../../config.js'
 import { setup, teardown } from '../../_testHelpers/index.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('lalala authorizer tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/custom-authentication/authenticationCustomVariable.test.js b/tests/integration/custom-authentication/authenticationCustomVariable.test.js
index 4e05f12cc..6a3372030 100644
--- a/tests/integration/custom-authentication/authenticationCustomVariable.test.js
+++ b/tests/integration/custom-authentication/authenticationCustomVariable.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { BASE_URL } from '../../config.js'
 import { setup, teardown } from '../../_testHelpers/index.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('custom authentication serverless-offline variable tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/docker/access-host/accessHost.test.js b/tests/integration/docker/access-host/accessHost.test.js
index 79478af7b..f176ab2e2 100644
--- a/tests/integration/docker/access-host/accessHost.test.js
+++ b/tests/integration/docker/access-host/accessHost.test.js
@@ -1,19 +1,16 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
 import { Server } from '@hapi/hapi'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import installNpmModules from '../../../installNpmModules.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Access host with Docker tests', function desc() {
   let server
 
   beforeEach(async () => {
-    await installNpmModules(resolve(__dirname, 'src'))
+    await installNpmModules(join(import.meta.url, 'src'))
   })
 
   beforeEach(async () => {
@@ -29,7 +26,7 @@ describe('Access host with Docker tests', function desc() {
     await server.start()
 
     await setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     })
   })
 
diff --git a/tests/integration/docker/artifact/artifact.test.js b/tests/integration/docker/artifact/artifact.test.js
index e61a747d7..406c0be42 100644
--- a/tests/integration/docker/artifact/artifact.test.js
+++ b/tests/integration/docker/artifact/artifact.test.js
@@ -1,7 +1,6 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import {
   compressArtifact,
   setup,
@@ -9,13 +8,13 @@ import {
 } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Artifact with docker tests', function desc() {
   beforeEach(async () => {
-    await compressArtifact(__dirname, 'artifacts/hello.zip', ['handler.js'])
+    await compressArtifact(join(import.meta.url), 'artifacts/hello.zip', [
+      'handler.js',
+    ])
     return setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     })
   })
 
diff --git a/tests/integration/docker/go/go1.x/dockerGo1.x.test.js b/tests/integration/docker/go/go1.x/dockerGo1.x.test.js
index f174a8cc7..7ed1dd945 100644
--- a/tests/integration/docker/go/go1.x/dockerGo1.x.test.js
+++ b/tests/integration/docker/go/go1.x/dockerGo1.x.test.js
@@ -1,8 +1,7 @@
 import assert from 'node:assert'
 import { platform } from 'node:os'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import {
   buildInContainer,
   setup,
@@ -10,12 +9,10 @@ import {
 } from '../../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Go 1.x with Docker tests', function desc() {
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     })
   })
 
@@ -38,11 +35,12 @@ describe('Go 1.x with Docker tests', function desc() {
         this.skip()
       }
 
-      await buildInContainer('go1.x', resolve(__dirname), '/go/src/handler', [
-        'make',
-        'clean',
-        'build',
-      ])
+      await buildInContainer(
+        'go1.x',
+        join(import.meta.url),
+        '/go/src/handler',
+        ['make', 'clean', 'build'],
+      )
 
       const url = new URL(path, BASE_URL)
       const response = await fetch(url)
diff --git a/tests/integration/docker/layers/dockerLayers.test.js b/tests/integration/docker/layers/dockerLayers.test.js
index 309af28fc..89805cdfd 100644
--- a/tests/integration/docker/layers/dockerLayers.test.js
+++ b/tests/integration/docker/layers/dockerLayers.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Layers with Docker tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/docker/multiple/dockerMultiple.test.js b/tests/integration/docker/multiple/dockerMultiple.test.js
index 46fe5030b..82cecdda9 100644
--- a/tests/integration/docker/multiple/dockerMultiple.test.js
+++ b/tests/integration/docker/multiple/dockerMultiple.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Multiple docker containers', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/docker/nodejs/nodejs12.x/dockerNodejs12.x.test.js b/tests/integration/docker/nodejs/nodejs12.x/dockerNodejs12.x.test.js
index 7d6c3f67b..3a33e13fd 100644
--- a/tests/integration/docker/nodejs/nodejs12.x/dockerNodejs12.x.test.js
+++ b/tests/integration/docker/nodejs/nodejs12.x/dockerNodejs12.x.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Node.js 12.x with Docker tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/docker/provided/dockerProvided.test.js b/tests/integration/docker/provided/dockerProvided.test.js
index ba2b28dc8..12a1520f1 100644
--- a/tests/integration/docker/provided/dockerProvided.test.js
+++ b/tests/integration/docker/provided/dockerProvided.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Provided with Docker tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/docker/python/python3.6/dockerPython3.6.test.js b/tests/integration/docker/python/python3.6/dockerPython3.6.test.js
index 1bd1ffbb0..3e8d6fcf2 100644
--- a/tests/integration/docker/python/python3.6/dockerPython3.6.test.js
+++ b/tests/integration/docker/python/python3.6/dockerPython3.6.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Python 3.6 with Docker tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/docker/python/python3.7/dockerPython3.7.test.js b/tests/integration/docker/python/python3.7/dockerPython3.7.test.js
index 6d58b673e..6b6df2869 100644
--- a/tests/integration/docker/python/python3.7/dockerPython3.7.test.js
+++ b/tests/integration/docker/python/python3.7/dockerPython3.7.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Python 3.7 with Docker tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/docker/python/python3.8/dockerPython3.8.test.js b/tests/integration/docker/python/python3.8/dockerPython3.8.test.js
index fba35105b..533ce0cbe 100644
--- a/tests/integration/docker/python/python3.8/dockerPython3.8.test.js
+++ b/tests/integration/docker/python/python3.8/dockerPython3.8.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Python 3.8 with Docker tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/docker/ruby/ruby2.7/dockerRuby2.7.test.js b/tests/integration/docker/ruby/ruby2.7/dockerRuby2.7.test.js
index d5a15f393..469358b8f 100644
--- a/tests/integration/docker/ruby/ruby2.7/dockerRuby2.7.test.js
+++ b/tests/integration/docker/ruby/ruby2.7/dockerRuby2.7.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Ruby 2.7 with Docker tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/handler/handlerPayload.test.js b/tests/integration/handler/handlerPayload.test.js
index 47ac84829..d7bbbffd7 100644
--- a/tests/integration/handler/handlerPayload.test.js
+++ b/tests/integration/handler/handlerPayload.test.js
@@ -1,18 +1,15 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 
 const { stringify } = JSON
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('handler payload tests', function desc() {
   beforeEach(() =>
     setup({
       noPrependStageInUrl: false,
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
@@ -180,7 +177,7 @@ describe('handler payload tests with prepend off', function desc() {
   beforeEach(() =>
     setup({
       args: ['--noPrependStageInUrl'],
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
@@ -327,7 +324,7 @@ describe('handler payload schemas validation tests', function desc() {
   beforeEach(() =>
     setup({
       args: ['--noPrependStageInUrl'],
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/httpApi-cors-default/httpApi-cors-default.test.js b/tests/integration/httpApi-cors-default/httpApi-cors-default.test.js
index e9f1cee96..6fd8d9a49 100644
--- a/tests/integration/httpApi-cors-default/httpApi-cors-default.test.js
+++ b/tests/integration/httpApi-cors-default/httpApi-cors-default.test.js
@@ -2,17 +2,14 @@
 // https://dev.to/piczmar_0/serverless-authorizers---custom-rest-authorizer-16
 
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('HttpApi Cors Default Tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/httpApi-cors/httpApi-cors.test.js b/tests/integration/httpApi-cors/httpApi-cors.test.js
index c12d21518..e731ec770 100644
--- a/tests/integration/httpApi-cors/httpApi-cors.test.js
+++ b/tests/integration/httpApi-cors/httpApi-cors.test.js
@@ -2,17 +2,14 @@
 // https://dev.to/piczmar_0/serverless-authorizers---custom-rest-authorizer-16
 
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('HttpApi Cors Tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/httpApi-headers/httpApi-headers.test.js b/tests/integration/httpApi-headers/httpApi-headers.test.js
index bcea809ee..e58916640 100644
--- a/tests/integration/httpApi-headers/httpApi-headers.test.js
+++ b/tests/integration/httpApi-headers/httpApi-headers.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('HttpApi Headers Tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/jwt-authorizer/jwt-authorizer.test.js b/tests/integration/jwt-authorizer/jwt-authorizer.test.js
index 261264366..6773c182f 100644
--- a/tests/integration/jwt-authorizer/jwt-authorizer.test.js
+++ b/tests/integration/jwt-authorizer/jwt-authorizer.test.js
@@ -3,8 +3,7 @@
 
 import assert from 'node:assert'
 import { randomBytes } from 'node:crypto'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { SignJWT } from 'jose'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
@@ -12,8 +11,6 @@ import { BASE_URL } from '../../config.js'
 const { now } = Date
 const { floor } = Math
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 const secret = randomBytes(256)
 
 const baseJWT = {
@@ -78,7 +75,7 @@ describe('jwt authorizer tests', function desc() {
   beforeEach(() =>
     setup({
       args: ['--ignoreJWTSignature'],
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/lambda-integration/lambdaIntegration.test.js b/tests/integration/lambda-integration/lambdaIntegration.test.js
index 4773bf7cb..bedc54ca4 100644
--- a/tests/integration/lambda-integration/lambdaIntegration.test.js
+++ b/tests/integration/lambda-integration/lambdaIntegration.test.js
@@ -1,17 +1,14 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 
 const { stringify } = JSON
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('lambda integration tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/lambda-invoke-aws-sdk-v2/lambdaInvoke.test.js b/tests/integration/lambda-invoke-aws-sdk-v2/lambdaInvoke.test.js
index e6e11a43d..d00790a56 100644
--- a/tests/integration/lambda-invoke-aws-sdk-v2/lambdaInvoke.test.js
+++ b/tests/integration/lambda-invoke-aws-sdk-v2/lambdaInvoke.test.js
@@ -1,6 +1,5 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 import installNpmModules from '../../installNpmModules.js'
@@ -8,16 +7,14 @@ import installNpmModules from '../../installNpmModules.js'
 const { isArray } = Array
 const { parse, stringify } = JSON
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Lambda.invoke aws-sdk v2 tests', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'src'))
+    await installNpmModules(join(import.meta.url, 'src'))
   })
 
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/lambda-invoke-aws-sdk-v2/lambdaInvokeAsync.test.js b/tests/integration/lambda-invoke-aws-sdk-v2/lambdaInvokeAsync.test.js
index 592c44193..b5210dc57 100644
--- a/tests/integration/lambda-invoke-aws-sdk-v2/lambdaInvokeAsync.test.js
+++ b/tests/integration/lambda-invoke-aws-sdk-v2/lambdaInvokeAsync.test.js
@@ -1,20 +1,17 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 import installNpmModules from '../../installNpmModules.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Lambda.invokeAsync aws-sdk v2 tests', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'src'))
+    await installNpmModules(join(import.meta.url, 'src'))
   })
 
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/lambda-invoke-aws-sdk-v3/lambdaInvoke.test.js b/tests/integration/lambda-invoke-aws-sdk-v3/lambdaInvoke.test.js
index 610d73fcc..ccba1f87c 100644
--- a/tests/integration/lambda-invoke-aws-sdk-v3/lambdaInvoke.test.js
+++ b/tests/integration/lambda-invoke-aws-sdk-v3/lambdaInvoke.test.js
@@ -1,6 +1,5 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 import installNpmModules from '../../installNpmModules.js'
@@ -8,16 +7,14 @@ import installNpmModules from '../../installNpmModules.js'
 const { isArray } = Array
 const { parse, stringify } = JSON
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Lambda.invoke aws-sdk v3 tests', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'src'))
+    await installNpmModules(join(import.meta.url, 'src'))
   })
 
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/lambda-invoke-aws-sdk-v3/lambdaInvokeAsync.test.js b/tests/integration/lambda-invoke-aws-sdk-v3/lambdaInvokeAsync.test.js
index c4e5e258a..7a3dacca1 100644
--- a/tests/integration/lambda-invoke-aws-sdk-v3/lambdaInvokeAsync.test.js
+++ b/tests/integration/lambda-invoke-aws-sdk-v3/lambdaInvokeAsync.test.js
@@ -1,20 +1,17 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 import installNpmModules from '../../installNpmModules.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Lambda.invokeAsync aws-sdk v3 tests', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'src'))
+    await installNpmModules(join(import.meta.url, 'src'))
   })
 
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/override-authorizer/override-authorizer.test.js b/tests/integration/override-authorizer/override-authorizer.test.js
index e58845ba1..bf57b0e44 100644
--- a/tests/integration/override-authorizer/override-authorizer.test.js
+++ b/tests/integration/override-authorizer/override-authorizer.test.js
@@ -1,14 +1,11 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 
 const { stringify } = JSON
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 const envAuthorizer = {
   iam: {
     cognitoUser: {
@@ -32,7 +29,7 @@ describe('override authorizer tests', function desc() {
     env.AUTHORIZER = stringify(envAuthorizer)
 
     await setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     })
   })
 
diff --git a/tests/integration/request-authorizer/request-authorizer.test.js b/tests/integration/request-authorizer/request-authorizer.test.js
index 7359aa0c0..e45749a02 100644
--- a/tests/integration/request-authorizer/request-authorizer.test.js
+++ b/tests/integration/request-authorizer/request-authorizer.test.js
@@ -2,17 +2,14 @@
 // https://dev.to/piczmar_0/serverless-authorizers---custom-rest-authorizer-16
 
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { BASE_URL } from '../../config.js'
 import { setup, teardown } from '../../_testHelpers/index.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('request authorizer tests', () => {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/uncategorized/uncategorized.test.js b/tests/integration/uncategorized/uncategorized.test.js
index d1db37d8b..03e394d1a 100644
--- a/tests/integration/uncategorized/uncategorized.test.js
+++ b/tests/integration/uncategorized/uncategorized.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('uncategorized tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/websocket-authorizer/websocket-authorizer.test.js b/tests/integration/websocket-authorizer/websocket-authorizer.test.js
index 181cf500e..c186cda36 100644
--- a/tests/integration/websocket-authorizer/websocket-authorizer.test.js
+++ b/tests/integration/websocket-authorizer/websocket-authorizer.test.js
@@ -1,17 +1,14 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { WebSocket } from 'ws'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import websocketSend from '../../_testHelpers/websocketPromise.js'
 import { BASE_URL } from '../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('websocket authorizer tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/websocket-oneway/websocket-oneway.test.js b/tests/integration/websocket-oneway/websocket-oneway.test.js
index 4624564be..87c7bb04d 100644
--- a/tests/integration/websocket-oneway/websocket-oneway.test.js
+++ b/tests/integration/websocket-oneway/websocket-oneway.test.js
@@ -1,6 +1,5 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { WebSocket } from 'ws'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import websocketSend from '../../_testHelpers/websocketPromise.js'
@@ -8,12 +7,10 @@ import { BASE_URL } from '../../config.js'
 
 const { parse, stringify } = JSON
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('one way websocket tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/integration/websocket-twoway/websocket-twoway.test.js b/tests/integration/websocket-twoway/websocket-twoway.test.js
index 2e7238bfe..e8f477de7 100644
--- a/tests/integration/websocket-twoway/websocket-twoway.test.js
+++ b/tests/integration/websocket-twoway/websocket-twoway.test.js
@@ -1,6 +1,5 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { WebSocket } from 'ws'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import websocketSend from '../../_testHelpers/websocketPromise.js'
@@ -8,12 +7,10 @@ import { BASE_URL } from '../../config.js'
 
 const { parse, stringify } = JSON
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('two way websocket tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/lambda-run-mode/in-process/env-vars/in-process-env-vars.test.js b/tests/lambda-run-mode/in-process/env-vars/in-process-env-vars.test.js
index b40794910..dea108b7c 100644
--- a/tests/lambda-run-mode/in-process/env-vars/in-process-env-vars.test.js
+++ b/tests/lambda-run-mode/in-process/env-vars/in-process-env-vars.test.js
@@ -1,18 +1,15 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('run mode with worker threads', function desc() {
   beforeEach(() =>
     setup({
       env: {
         SHOULD_BE_SHARED: 'SHOULD_BE_SHARED',
       },
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/lambda-run-mode/in-process/instances/in-process-instances.test.js b/tests/lambda-run-mode/in-process/instances/in-process-instances.test.js
index 265422ff0..452e5d935 100644
--- a/tests/lambda-run-mode/in-process/instances/in-process-instances.test.js
+++ b/tests/lambda-run-mode/in-process/instances/in-process-instances.test.js
@@ -1,18 +1,15 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
 import { promisify } from 'node:util'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
 const setTimeoutPromise = promisify(setTimeout)
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('run mode with in-process', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/lambda-run-mode/worker-threads/env-vars/worker-threads-env-vars.test.js b/tests/lambda-run-mode/worker-threads/env-vars/worker-threads-env-vars.test.js
index 60cb6d69a..b101afc9c 100644
--- a/tests/lambda-run-mode/worker-threads/env-vars/worker-threads-env-vars.test.js
+++ b/tests/lambda-run-mode/worker-threads/env-vars/worker-threads-env-vars.test.js
@@ -1,11 +1,8 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('run mode with worker threads', function desc() {
   beforeEach(() =>
     setup({
@@ -14,7 +11,7 @@ describe('run mode with worker threads', function desc() {
         AWS_FOOBAR: 'SHOULD_BE_SHARED',
         ENV_SHOULD_NOT_BE_SHARED: 'ENV_SHOULD_NOT_BE_SHARED',
       },
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/lambda-run-mode/worker-threads/instances/worker-threads-instances.test.js b/tests/lambda-run-mode/worker-threads/instances/worker-threads-instances.test.js
index 570235397..436a1904c 100644
--- a/tests/lambda-run-mode/worker-threads/instances/worker-threads-instances.test.js
+++ b/tests/lambda-run-mode/worker-threads/instances/worker-threads-instances.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('run mode with worker threads', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/lambda-run-mode/worker-threads/local-env-vars/worker-threads-local-env-vars.test.js b/tests/lambda-run-mode/worker-threads/local-env-vars/worker-threads-local-env-vars.test.js
index fceb8eb04..19f50a99e 100644
--- a/tests/lambda-run-mode/worker-threads/local-env-vars/worker-threads-local-env-vars.test.js
+++ b/tests/lambda-run-mode/worker-threads/local-env-vars/worker-threads-local-env-vars.test.js
@@ -1,11 +1,8 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('run mode with worker threads and --localEnvironment flag', function desc() {
   beforeEach(() =>
     setup({
@@ -14,7 +11,7 @@ describe('run mode with worker threads and --localEnvironment flag', function de
         AWS_FOOBAR: 'SHOULD_BE_SHARED',
         ENV_SHOULD_BE_SHARED: 'ENV_SHOULD_BE_SHARED',
       },
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/lambda-run-mode/worker-threads/reload-handler/reload-handler.test.js b/tests/lambda-run-mode/worker-threads/reload-handler/reload-handler.test.js
index be1f0fefa..1efa49f38 100644
--- a/tests/lambda-run-mode/worker-threads/reload-handler/reload-handler.test.js
+++ b/tests/lambda-run-mode/worker-threads/reload-handler/reload-handler.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('run mode with worker threads', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/lambda-run-mode/worker-threads/timeout/worker-threads-timeout.test.js b/tests/lambda-run-mode/worker-threads/timeout/worker-threads-timeout.test.js
index 8252733f9..cd4e56884 100644
--- a/tests/lambda-run-mode/worker-threads/timeout/worker-threads-timeout.test.js
+++ b/tests/lambda-run-mode/worker-threads/timeout/worker-threads-timeout.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('run mode with worker threads', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/runtimes/go/aws-golang-simple-http-endpoint/aws-golang-simple-http-endpoint.test.js b/tests/runtimes/go/aws-golang-simple-http-endpoint/aws-golang-simple-http-endpoint.test.js
index fcff85f4c..80949c0c4 100644
--- a/tests/runtimes/go/aws-golang-simple-http-endpoint/aws-golang-simple-http-endpoint.test.js
+++ b/tests/runtimes/go/aws-golang-simple-http-endpoint/aws-golang-simple-http-endpoint.test.js
@@ -1,17 +1,14 @@
 /* eslint-disable no-await-in-loop */
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('aws golang simple http endpoint', function desc() {
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     })
   })
 
diff --git a/tests/runtimes/go/go1.x/go1.x.test.js b/tests/runtimes/go/go1.x/go1.x.test.js
index 8b6160674..ced2c3f6d 100644
--- a/tests/runtimes/go/go1.x/go1.x.test.js
+++ b/tests/runtimes/go/go1.x/go1.x.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Go 1.x with GoRunner', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/runtimes/java/groovy/groovy.test.js b/tests/runtimes/java/groovy/groovy.test.js
index 040f82c43..4bc132a9e 100644
--- a/tests/runtimes/java/groovy/groovy.test.js
+++ b/tests/runtimes/java/groovy/groovy.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Groovy tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/runtimes/java/java/java.test.js b/tests/runtimes/java/java/java.test.js
index 86c15d2c7..bf6a13805 100644
--- a/tests/runtimes/java/java/java.test.js
+++ b/tests/runtimes/java/java/java.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Java tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/runtimes/java/kotlin/kotlin.test.js b/tests/runtimes/java/kotlin/kotlin.test.js
index 47665d74b..aedcc9bd0 100644
--- a/tests/runtimes/java/kotlin/kotlin.test.js
+++ b/tests/runtimes/java/kotlin/kotlin.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Kotlin tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/runtimes/java/scala/scala.test.js b/tests/runtimes/java/scala/scala.test.js
index 2c0a42b95..452513116 100644
--- a/tests/runtimes/java/scala/scala.test.js
+++ b/tests/runtimes/java/scala/scala.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Scala tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/runtimes/python/python-big-json/python-big-json.test.js b/tests/runtimes/python/python-big-json/python-big-json.test.js
index 914fcc9c2..d246c87d9 100644
--- a/tests/runtimes/python/python-big-json/python-big-json.test.js
+++ b/tests/runtimes/python/python-big-json/python-big-json.test.js
@@ -1,17 +1,14 @@
 import assert from 'node:assert'
 import { platform } from 'node:os'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Python 3 tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/runtimes/python/python-module/python-module.test.js b/tests/runtimes/python/python-module/python-module.test.js
index fcc124da4..a2dbf668e 100644
--- a/tests/runtimes/python/python-module/python-module.test.js
+++ b/tests/runtimes/python/python-module/python-module.test.js
@@ -1,18 +1,15 @@
 import assert from 'node:assert'
 import { platform } from 'node:os'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import fetch from 'node-fetch'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Python 3 tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/runtimes/python/python3/python3.test.js b/tests/runtimes/python/python3/python3.test.js
index cef25cc97..67c0177c4 100644
--- a/tests/runtimes/python/python3/python3.test.js
+++ b/tests/runtimes/python/python3/python3.test.js
@@ -1,17 +1,14 @@
 import assert from 'node:assert'
 import { platform } from 'node:os'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Python 3 tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/runtimes/ruby/ruby.test.js b/tests/runtimes/ruby/ruby.test.js
index c2e22b9c9..9d5949127 100644
--- a/tests/runtimes/ruby/ruby.test.js
+++ b/tests/runtimes/ruby/ruby.test.js
@@ -1,16 +1,13 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../_testHelpers/index.js'
 import { BASE_URL } from '../../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('Ruby tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )
 
diff --git a/tests/scenario/docker/docker-in-docker/docker-in-docker.test.js b/tests/scenario/docker/docker-in-docker/docker-in-docker.test.js
index b98c83b4c..4efbe8d84 100644
--- a/tests/scenario/docker/docker-in-docker/docker-in-docker.test.js
+++ b/tests/scenario/docker/docker-in-docker/docker-in-docker.test.js
@@ -1,20 +1,17 @@
 import assert from 'node:assert'
 import { platform, userInfo } from 'node:os'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { execa } from 'execa'
 import { compressArtifact } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 import installNpmModules from '../../../installNpmModules.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('docker in docker', function desc() {
   const { uid, gid } = userInfo()
 
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'app'))
+    await installNpmModules(join(import.meta.url, 'app'))
   })
 
   beforeEach(async () => {
@@ -22,10 +19,10 @@ describe('docker in docker', function desc() {
       return Promise.resolve()
     }
     await Promise.all([
-      compressArtifact(resolve(__dirname, 'app'), 'artifacts/hello.zip', [
+      compressArtifact(join(import.meta.url, 'app'), 'artifacts/hello.zip', [
         'handler.js',
       ]),
-      compressArtifact(resolve(__dirname, 'app'), 'artifacts/layer.zip', [
+      compressArtifact(join(import.meta.url, 'app'), 'artifacts/layer.zip', [
         'handler.sh',
       ]),
     ])
@@ -36,7 +33,7 @@ describe('docker in docker', function desc() {
     }
 
     const composeEnv = {
-      HOST_SERVICE_PATH: resolve(__dirname, 'app'),
+      HOST_SERVICE_PATH: join(import.meta.url, 'app'),
     }
     if (platform() === 'windows') {
       // https://github.com/docker/for-win/issues/1829
@@ -48,7 +45,7 @@ describe('docker in docker', function desc() {
 
     const composeProcess = execa('docker-compose', [...composeFileArgs, 'up'], {
       all: true,
-      cwd: resolve(__dirname, 'app'),
+      cwd: join(import.meta.url, 'app'),
       env: composeEnv,
     })
 
@@ -68,7 +65,7 @@ describe('docker in docker', function desc() {
       return Promise.resolve()
     }
     return execa('docker-compose', ['down'], {
-      cwd: resolve(__dirname, 'app'),
+      cwd: join(import.meta.url, 'app'),
     })
   })
 
diff --git a/tests/scenario/docker/docker-serverless-webpack/docker-serverless-webpack.test.js b/tests/scenario/docker/docker-serverless-webpack/docker-serverless-webpack.test.js
index f708a0515..5886bb7a6 100644
--- a/tests/scenario/docker/docker-serverless-webpack/docker-serverless-webpack.test.js
+++ b/tests/scenario/docker/docker-serverless-webpack/docker-serverless-webpack.test.js
@@ -1,21 +1,18 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 import installNpmModules from '../../../installNpmModules.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('docker and serverless-webpack', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'app'))
+    await installNpmModules(join(import.meta.url, 'app'))
   })
 
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname, 'app'),
+      servicePath: join(import.meta.url, 'app'),
     })
   })
 
diff --git a/tests/scenario/lambda-frameworks/apollo-federation-supergraph/apollo-federation-supergraph.test.js b/tests/scenario/lambda-frameworks/apollo-federation-supergraph/apollo-federation-supergraph.test.js
index e93c7d819..ce0aad30e 100644
--- a/tests/scenario/lambda-frameworks/apollo-federation-supergraph/apollo-federation-supergraph.test.js
+++ b/tests/scenario/lambda-frameworks/apollo-federation-supergraph/apollo-federation-supergraph.test.js
@@ -1,22 +1,19 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 import installNpmModules from '../../../installNpmModules.js'
 
 const { stringify } = JSON
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('apollo federation supergraph', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'app'))
+    await installNpmModules(join(import.meta.url, 'app'))
   })
 
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname, 'app'),
+      servicePath: join(import.meta.url, 'app'),
     })
   })
 
diff --git a/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/gateway/src/index.js b/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/gateway/src/index.js
index 03eb7d28a..8f2219c77 100755
--- a/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/gateway/src/index.js
+++ b/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/gateway/src/index.js
@@ -1,15 +1,13 @@
 import { readFile } from 'node:fs/promises'
-import { dirname, join, resolve } from 'node:path'
+import { join as pathJoin } from 'node:path'
 import { env } from 'node:process'
-import { fileURLToPath } from 'node:url'
 import { ApolloGateway, RemoteGraphQLDataSource } from '@apollo/gateway'
 import { ApolloServer } from '@apollo/server'
 import { startServerAndCreateLambdaHandler } from '@as-integrations/aws-lambda'
-
-const __dirname = dirname(fileURLToPath(import.meta.url))
+import { join } from 'desm'
 
 const schema = await readFile(
-  resolve(__dirname, '../schema/supergraph-gateway.graphql'),
+  join(import.meta.url, '../schema/supergraph-gateway.graphql'),
   'utf8',
 )
 
@@ -18,7 +16,7 @@ const gateway = new ApolloGateway({
     const { name, url } = definition
 
     // TEMNP, we should probably always use env.API_GATEWAY?
-    const remoteUrl = join(env.IS_OFFLINE ? url : env.APIGATEWAY_URL, name)
+    const remoteUrl = pathJoin(env.IS_OFFLINE ? url : env.APIGATEWAY_URL, name)
 
     return new RemoteGraphQLDataSource({
       url: remoteUrl,
diff --git a/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/inventory/src/index.js b/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/inventory/src/index.js
index 98bb3f132..c494844d2 100755
--- a/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/inventory/src/index.js
+++ b/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/inventory/src/index.js
@@ -1,16 +1,13 @@
 import { readFile } from 'node:fs/promises'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
 import { ApolloServer } from '@apollo/server'
 import { buildSubgraphSchema } from '@apollo/subgraph'
 import { startServerAndCreateLambdaHandler } from '@as-integrations/aws-lambda'
+import { join } from 'desm'
 import gql from 'graphql-tag'
 import resolvers from './resolvers.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 const schema = await readFile(
-  resolve(__dirname, '../schema/inventory.graphql'),
+  join(import.meta.url, '../schema/inventory.graphql'),
   'utf8',
 )
 
diff --git a/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/products/src/index.js b/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/products/src/index.js
index 8c956a6db..005107669 100755
--- a/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/products/src/index.js
+++ b/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/products/src/index.js
@@ -1,16 +1,13 @@
 import { readFile } from 'node:fs/promises'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
 import { ApolloServer } from '@apollo/server'
 import { buildSubgraphSchema } from '@apollo/subgraph'
 import { startServerAndCreateLambdaHandler } from '@as-integrations/aws-lambda'
+import { join } from 'desm'
 import gql from 'graphql-tag'
 import resolvers from './resolvers.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 const schema = await readFile(
-  resolve(__dirname, '../schema/products.graphql'),
+  join(import.meta.url, '../schema/products.graphql'),
   'utf8',
 )
 
diff --git a/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/users/src/index.js b/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/users/src/index.js
index f4624c808..6ad7c108b 100755
--- a/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/users/src/index.js
+++ b/tests/scenario/lambda-frameworks/apollo-federation-supergraph/app/users/src/index.js
@@ -1,16 +1,13 @@
 import { readFile } from 'node:fs/promises'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { ApolloServer } from '@apollo/server'
 import { buildSubgraphSchema } from '@apollo/subgraph'
 import { startServerAndCreateLambdaHandler } from '@as-integrations/aws-lambda'
 import gql from 'graphql-tag'
 import resolvers from './resolvers.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 const schema = await readFile(
-  resolve(__dirname, '../schema/users.graphql'),
+  join(import.meta.url, '../schema/users.graphql'),
   'utf8',
 )
 
diff --git a/tests/scenario/lambda-frameworks/apollo-server-integrations/apollo-server-integrations.test.js b/tests/scenario/lambda-frameworks/apollo-server-integrations/apollo-server-integrations.test.js
index 8ce522aa6..2dd014d81 100644
--- a/tests/scenario/lambda-frameworks/apollo-server-integrations/apollo-server-integrations.test.js
+++ b/tests/scenario/lambda-frameworks/apollo-server-integrations/apollo-server-integrations.test.js
@@ -1,22 +1,19 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 import installNpmModules from '../../../installNpmModules.js'
 
 const { stringify } = JSON
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('apollo server integrations', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'app'))
+    await installNpmModules(join(import.meta.url, 'app'))
   })
 
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname, 'app'),
+      servicePath: join(import.meta.url, 'app'),
     })
   })
 
diff --git a/tests/scenario/lambda-frameworks/middy-lambda/middy-lambda.test.js b/tests/scenario/lambda-frameworks/middy-lambda/middy-lambda.test.js
index bf30140bb..0539bc32d 100644
--- a/tests/scenario/lambda-frameworks/middy-lambda/middy-lambda.test.js
+++ b/tests/scenario/lambda-frameworks/middy-lambda/middy-lambda.test.js
@@ -1,22 +1,19 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 import installNpmModules from '../../../installNpmModules.js'
 
 const { stringify } = JSON
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('middy with lambda', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'app'))
+    await installNpmModules(join(import.meta.url, 'app'))
   })
 
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname, 'app'),
+      servicePath: join(import.meta.url, 'app'),
     })
   })
 
diff --git a/tests/scenario/lambda-frameworks/serverless-http-with-express/serverless-http-with-express.test.js b/tests/scenario/lambda-frameworks/serverless-http-with-express/serverless-http-with-express.test.js
index cf8e17eb9..7a4fb0ce7 100644
--- a/tests/scenario/lambda-frameworks/serverless-http-with-express/serverless-http-with-express.test.js
+++ b/tests/scenario/lambda-frameworks/serverless-http-with-express/serverless-http-with-express.test.js
@@ -1,22 +1,19 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 import installNpmModules from '../../../installNpmModules.js'
 
 const { stringify } = JSON
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('serverless-http with express', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'app'))
+    await installNpmModules(join(import.meta.url, 'app'))
   })
 
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname, 'app'),
+      servicePath: join(import.meta.url, 'app'),
     })
   })
 
diff --git a/tests/scenario/lambda-frameworks/sparticuz-chrome-aws-lambda/sparticuz-chrome-aws-lambda-http-api.test.js b/tests/scenario/lambda-frameworks/sparticuz-chrome-aws-lambda/sparticuz-chrome-aws-lambda-http-api.test.js
index e6b6c3231..c14b7faae 100644
--- a/tests/scenario/lambda-frameworks/sparticuz-chrome-aws-lambda/sparticuz-chrome-aws-lambda-http-api.test.js
+++ b/tests/scenario/lambda-frameworks/sparticuz-chrome-aws-lambda/sparticuz-chrome-aws-lambda-http-api.test.js
@@ -1,21 +1,18 @@
 import assert from 'node:assert'
 import { platform } from 'node:os'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 import installNpmModules from '../../../installNpmModules.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('@sparticuz/chrome-aws-lambda http api', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'app-http-api'))
+    await installNpmModules(join(import.meta.url, 'app-http-api'))
   })
 
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname, 'app-http-api'),
+      servicePath: join(import.meta.url, 'app-http-api'),
     })
   })
 
diff --git a/tests/scenario/lambda-frameworks/sparticuz-chrome-aws-lambda/sparticuz-chrome-aws-lambda-http.test.js b/tests/scenario/lambda-frameworks/sparticuz-chrome-aws-lambda/sparticuz-chrome-aws-lambda-http.test.js
index 3f51ca938..bc6212c1c 100644
--- a/tests/scenario/lambda-frameworks/sparticuz-chrome-aws-lambda/sparticuz-chrome-aws-lambda-http.test.js
+++ b/tests/scenario/lambda-frameworks/sparticuz-chrome-aws-lambda/sparticuz-chrome-aws-lambda-http.test.js
@@ -1,21 +1,18 @@
 import assert from 'node:assert'
 import { platform } from 'node:os'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 import installNpmModules from '../../../installNpmModules.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('@sparticuz/chrome-aws-lambda http', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'app-http'))
+    await installNpmModules(join(import.meta.url, 'app-http'))
   })
 
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname, 'app-http'),
+      servicePath: join(import.meta.url, 'app-http'),
     })
   })
 
diff --git a/tests/scenario/lambda-frameworks/vendia-serverless-express/vendia-serverless-express.test.js b/tests/scenario/lambda-frameworks/vendia-serverless-express/vendia-serverless-express.test.js
index 5698bc052..f6c40a964 100644
--- a/tests/scenario/lambda-frameworks/vendia-serverless-express/vendia-serverless-express.test.js
+++ b/tests/scenario/lambda-frameworks/vendia-serverless-express/vendia-serverless-express.test.js
@@ -1,24 +1,21 @@
 import assert from 'node:assert'
 import { Buffer } from 'node:buffer'
 import { readFile } from 'node:fs/promises'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 import installNpmModules from '../../../installNpmModules.js'
 
 const { stringify } = JSON
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('@vendia/serverless-express', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'app'))
+    await installNpmModules(join(import.meta.url, 'app'))
   })
 
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname, 'app'),
+      servicePath: join(import.meta.url, 'app'),
     })
   })
 
@@ -77,8 +74,7 @@ describe('@vendia/serverless-express', function desc() {
     const response = await fetch(url)
     const arrayBuffer = await response.arrayBuffer()
     const buffer = Buffer.from(arrayBuffer)
-
-    const image = await readFile(resolve(__dirname, 'app/src/sam-logo.png'))
+    const image = await readFile(join(import.meta.url, 'app/src/sam-logo.png'))
 
     assert.equal(response.status, 200)
     assert.deepEqual(buffer, image)
diff --git a/tests/scenario/serverless-plugins/serverless-esbuild/serverless-esbuild.test.js b/tests/scenario/serverless-plugins/serverless-esbuild/serverless-esbuild.test.js
index de0872f6d..7918194c0 100644
--- a/tests/scenario/serverless-plugins/serverless-esbuild/serverless-esbuild.test.js
+++ b/tests/scenario/serverless-plugins/serverless-esbuild/serverless-esbuild.test.js
@@ -1,20 +1,17 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 import installNpmModules from '../../../installNpmModules.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('serverless-esbuild', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'app'))
+    await installNpmModules(join(import.meta.url, 'app'))
   })
 
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname, 'app'),
+      servicePath: join(import.meta.url, 'app'),
     })
   })
 
diff --git a/tests/scenario/serverless-plugins/serverless-plugin-typescript/serverless-plugin-typescript.test.js b/tests/scenario/serverless-plugins/serverless-plugin-typescript/serverless-plugin-typescript.test.js
index 7f53a1ef9..ca1f5df1e 100644
--- a/tests/scenario/serverless-plugins/serverless-plugin-typescript/serverless-plugin-typescript.test.js
+++ b/tests/scenario/serverless-plugins/serverless-plugin-typescript/serverless-plugin-typescript.test.js
@@ -1,20 +1,17 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 import installNpmModules from '../../../installNpmModules.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('serverless-plugin-typescript', function desc() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'app'))
+    await installNpmModules(join(import.meta.url, 'app'))
   })
 
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname, 'app'),
+      servicePath: join(import.meta.url, 'app'),
     })
   })
 
diff --git a/tests/scenario/serverless-plugins/serverless-webpack/serverless-webpack.test.js b/tests/scenario/serverless-plugins/serverless-webpack/serverless-webpack.test.js
index e29b88da6..ce4a55ac4 100644
--- a/tests/scenario/serverless-plugins/serverless-webpack/serverless-webpack.test.js
+++ b/tests/scenario/serverless-plugins/serverless-webpack/serverless-webpack.test.js
@@ -1,20 +1,17 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../../../_testHelpers/index.js'
 import { BASE_URL } from '../../../config.js'
 import installNpmModules from '../../../installNpmModules.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('serverless-webpack', function describe() {
   before(async () => {
-    await installNpmModules(resolve(__dirname, 'app'))
+    await installNpmModules(join(import.meta.url, 'app'))
   })
 
   beforeEach(async () => {
     await setup({
-      servicePath: resolve(__dirname, 'app'),
+      servicePath: join(import.meta.url, 'app'),
     })
   })
 
diff --git a/tests/timeout/timeout.test.js b/tests/timeout/timeout.test.js
index 4f771406c..28c97eb5f 100644
--- a/tests/timeout/timeout.test.js
+++ b/tests/timeout/timeout.test.js
@@ -1,15 +1,12 @@
 import assert from 'node:assert'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'desm'
 import { setup, teardown } from '../_testHelpers/index.js'
 import { BASE_URL } from '../config.js'
 
-const __dirname = dirname(fileURLToPath(import.meta.url))
-
 describe('handler payload tests', function desc() {
   beforeEach(() =>
     setup({
-      servicePath: resolve(__dirname),
+      servicePath: join(import.meta.url),
     }),
   )