diff --git a/tests/specs/json.ts b/tests/specs/json.ts
index b09dd7f..4f4d34c 100644
--- a/tests/specs/json.ts
+++ b/tests/specs/json.ts
@@ -1,4 +1,5 @@
 import path from 'path';
+import { pathToFileURL } from 'url';
 import { testSuite, expect } from 'manten';
 import { createFixture } from 'fs-fixture';
 import type { NodeApis } from '../utils/node-with-loader.js';
@@ -20,30 +21,30 @@ export default testSuite(async ({ describe }, node: NodeApis) => {
 
 		describe('full path', ({ test }) => {
 			const importPath = path.join(fixture.path, 'index.json');
-
 			test('Load', async () => {
 				const nodeProcess = await node.load(importPath);
 				expect(nodeProcess.exitCode).toBe(0);
 				expect(nodeProcess.stdout).toBe('');
 			});
 
+			const importUrl = pathToFileURL(importPath).toString();
 			test('Import', async () => {
-				const nodeProcess = await node.import(importPath);
+				const nodeProcess = await node.import(importUrl);
 				expect(nodeProcess.stdout).toMatch('{"default":{"loaded":"json"},"loaded":"json"}');
 			});
 		});
 
 		describe('extensionless', ({ test }) => {
 			const importPath = path.join(fixture.path, 'index');
-
 			test('Load', async () => {
 				const nodeProcess = await node.load(importPath);
 				expect(nodeProcess.exitCode).toBe(0);
 				expect(nodeProcess.stdout).toBe('');
 			});
 
+			const importUrl = pathToFileURL(importPath).toString();
 			test('Import', async ({ onTestFail }) => {
-				const nodeProcess = await node.import(importPath);
+				const nodeProcess = await node.import(importUrl);
 				onTestFail(() => {
 					console.log(nodeProcess);
 				});
@@ -53,7 +54,6 @@ export default testSuite(async ({ describe }, node: NodeApis) => {
 
 		describe('directory', ({ test }) => {
 			const importPath = fixture.path;
-
 			test('Load', async ({ onTestFail }) => {
 				const nodeProcess = await node.load(importPath);
 				onTestFail(() => {
@@ -63,8 +63,9 @@ export default testSuite(async ({ describe }, node: NodeApis) => {
 				expect(nodeProcess.stdout).toBe('');
 			});
 
+			const importUrl = pathToFileURL(importPath).toString();
 			test('Import', async () => {
-				const nodeProcess = await node.import(importPath);
+				const nodeProcess = await node.import(importUrl);
 				expect(nodeProcess.stdout).toMatch('{"default":{"loaded":"json"},"loaded":"json"}');
 			});
 		});
@@ -81,24 +82,24 @@ export default testSuite(async ({ describe }, node: NodeApis) => {
 
 			describe('ambiguous path to directory should fallback to file', async ({ test }) => {
 				const importPath = path.join(fixture.path, 'index');
-
 				test('Load', async () => {
 					const nodeProcess = await node.load(importPath);
 					expect(nodeProcess.exitCode).toBe(0);
 					expect(nodeProcess.stdout).toBe('');
 				});
 
+				const importUrl = pathToFileURL(importPath).toString();
 				test('Import', async () => {
-					const nodeProcess = await node.import(importPath);
+					const nodeProcess = await node.import(importUrl);
 					expect(nodeProcess.stdout).toMatch('{"default":{"loaded":"json"},"loaded":"json"}');
 				});
 			});
 
 			describe('explicit directory should not fallback to file', ({ test }) => {
-				const importPath = path.join(fixture.path, 'index/');
+				const importUrl = pathToFileURL(path.join(fixture.path, 'index/')).toString();
 
 				test('Import', async () => {
-					const nodeProcess = await node.import(importPath);
+					const nodeProcess = await node.import(importUrl);
 					expect(nodeProcess.stderr).toMatch('ERR_MODULE_NOT_FOUND');
 				});
 			});
diff --git a/tests/utils/node-with-loader.ts b/tests/utils/node-with-loader.ts
index ee537d5..7772b5a 100644
--- a/tests/utils/node-with-loader.ts
+++ b/tests/utils/node-with-loader.ts
@@ -21,6 +21,7 @@ export const nodeWithLoader = (
 	{
 		env: {
 			ESBK_DISABLE_CACHE: '1',
+			TEST: '1',
 			...options.env,
 		},
 		nodeOptions: [