diff --git a/package.json b/package.json
index 30d4ea4..4904293 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
     "test": "yarn lint-prettier && yarn build && yarn lint"
   },
   "dependencies": {
-    "@magicspace/core": "^0.3.5",
+    "@magicspace/core": "^0.3.6",
     "@magicspace/utils": "^0.3.4",
     "lodash": "^4.17.20",
     "npm-which": "^3.0.1",
diff --git a/typescript/src/composables/jest.config.js.ts b/typescript/src/composables/jest.config.js.ts
new file mode 100644
index 0000000..63e7517
--- /dev/null
+++ b/typescript/src/composables/jest.config.js.ts
@@ -0,0 +1,44 @@
+import {join, posix} from 'path';
+
+import {composable, objectModule} from '@magicspace/core';
+
+import type {ResolvedOptions} from '../library/index.js';
+
+const COMMENT = `/** @type {import('jest').Config} */`;
+
+export default composable<ResolvedOptions>(({type, mono, resolvedProjects}) => {
+  const testProjects = resolvedProjects.filter(project => project.test);
+
+  return [
+    mono &&
+      objectModule(
+        'jest.config.js',
+        {
+          projects: testProjects.map(project => project.package.resolvedDir),
+        },
+        {
+          type,
+          comment: COMMENT,
+        },
+      ),
+    ...testProjects.map(({bldDir, package: {type, resolvedDir}}) => {
+      return objectModule(
+        join(resolvedDir, 'jest.config.js'),
+        (config: {testMatch?: string[]}) => {
+          return {
+            ...config,
+            transform: {},
+            testMatch: [
+              ...(config?.testMatch ?? []),
+              `<rootDir>/${posix.relative(resolvedDir, bldDir)}/test/*.test.js`,
+            ],
+          };
+        },
+        {
+          type,
+          comment: COMMENT,
+        },
+      );
+    }),
+  ];
+});
diff --git a/typescript/src/composables/package.json.ts b/typescript/src/composables/package.json.ts
index b4425ef..21dfb86 100644
--- a/typescript/src/composables/package.json.ts
+++ b/typescript/src/composables/package.json.ts
@@ -15,11 +15,18 @@ import type {
   ResolvedTypeScriptProjectOptions,
 } from '../library/index.js';
 
-const ROOT_DEV_DEPENDENCY_DICT = {
-  rimraf: '5',
-  typescript: '5',
-  'run-in-every': '0.2',
-};
+function ROOT_DEV_DEPENDENCY_DICT(test: boolean): Record<string, string> {
+  return {
+    ...(test && {
+      '@types/jest': '29',
+      'cross-env': '7',
+      jest: '29',
+    }),
+    rimraf: '5',
+    'run-in-every': '0.2',
+    typescript: '5',
+  };
+}
 
 const PROJECT_DEPENDENCY_DICT = {
   tslib: '2',
@@ -57,13 +64,15 @@ export default composable<ResolvedOptions>(
       packageOptions => packageOptions.packageJSONPath,
     );
 
+    const anyTestProject = projects.some(project => project.test);
+
     const [
       rootDevDependencies,
       projectDependencies,
       esmProjectEntrancesDependencies,
       cjsProjectEntrancesDependencies,
     ] = await Promise.all([
-      fetchPackageVersions(ROOT_DEV_DEPENDENCY_DICT),
+      fetchPackageVersions(ROOT_DEV_DEPENDENCY_DICT(anyTestProject)),
       fetchPackageVersions(PROJECT_DEPENDENCY_DICT),
       anyESMProjectWithEntrances
         ? fetchPackageVersions(PROJECT_ENTRANCES_DEPENDENCY_DICT(true))
@@ -111,9 +120,15 @@ export default composable<ResolvedOptions>(
         scripts = extendObjectProperties(
           scripts,
           {
-            test: extendPackageScript(scripts.test, `${packageManager} build`, {
-              after: '*lint-prettier*',
-            }),
+            'bare-test': anyTestProject
+              ? 'cross-env NODE_OPTIONS=--experimental-vm-modules jest'
+              : undefined,
+            test: extendPackageScript(
+              extendPackageScript(scripts.test, `${packageManager} build`, {
+                after: '*lint-prettier*',
+              }),
+              `${packageManager} bare-test`,
+            ),
           },
           {
             after: '*lint*',
diff --git a/typescript/src/composables/tsconfig.json.ts b/typescript/src/composables/tsconfig.json.ts
index 54460f3..f02ce90 100644
--- a/typescript/src/composables/tsconfig.json.ts
+++ b/typescript/src/composables/tsconfig.json.ts
@@ -37,13 +37,14 @@ export default composable<ResolvedOptions>(({resolvedProjects: projects}) => {
       JSON_OPTIONS,
     ),
     ...projects.map(
-      ({inDir, entrances, outDir, references, package: packageOptions}) =>
+      ({inDir, entrances, outDir, references, test, package: packageOptions}) =>
         json(
           Path.posix.join(inDir, 'tsconfig.json'),
           {
             extends: Path.posix.relative(inDir, 'tsconfig.base.json'),
             compilerOptions: {
               composite: true,
+              types: test ? ['jest'] : undefined,
               // fallback to undefined if no condition matched.
               experimentalDecorators:
                 (packageOptions.type !== 'module' && entrances.length > 0) ||
diff --git a/typescript/src/library/options.ts b/typescript/src/library/options.ts
index b477644..5ee3922 100644
--- a/typescript/src/library/options.ts
+++ b/typescript/src/library/options.ts
@@ -64,7 +64,7 @@ export const TypeScriptProjectOptions = x.object({
     .union([x.literal('library'), x.literal('program'), x.literal('script')])
     .nominal({
       description:
-        "Defaults to 'library' if project name is 'library', otherwise 'program'.",
+        "Defaults to 'library' if project name includes 'library', otherwise 'program'.",
     })
     .optional(),
   exports: x
@@ -80,7 +80,7 @@ export const TypeScriptProjectOptions = x.object({
     .nominal({
       description: `\
 Whether this TypeScript project is a development-time project, \
-defaults to true if the project name is 'test' or project type is 'script', \
+defaults to true if the project name includes 'test' or project type is 'script', \
 otherwise false.`,
     })
     .optional(),
@@ -109,6 +109,12 @@ Whether this project does not emit build artifact, \
 defaults to true if \`src\` is false, otherwise false.`,
     })
     .optional(),
+  test: x.boolean
+    .nominal({
+      description:
+        "Whether this project is a test project, defaults to true if `name` includes 'test', otherwise false.",
+    })
+    .optional(),
   entrances: x
     .union([x.array(x.string), x.boolean])
     .nominal({
@@ -159,6 +165,7 @@ export type ResolvedTypeScriptProjectOptions = {
   exportSourceAs: string | undefined;
   dev: boolean;
   noEmit: boolean;
+  test: boolean;
   entrances: string[];
   package: ResolvedPackageOptions;
   references: ResolvedTypeScriptProjectReference[] | undefined;
@@ -260,6 +267,7 @@ export function buildResolvedTypeScriptProjectOptions(
     src = type === 'script' ? false : 'src',
     dir = name,
     noEmit = src === false ? true : false,
+    test = name.includes('test') ? true : false,
     entrances = false,
     ...rest
   }: TypeScriptProjectOptions,
@@ -317,6 +325,7 @@ export function buildResolvedTypeScriptProjectOptions(
     exportSourceAs,
     dev,
     noEmit,
+    test,
     entrances:
       typeof entrances === 'boolean'
         ? entrances
diff --git a/yarn.lock b/yarn.lock
index 0328328..5b74f98 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -70,10 +70,10 @@
     wrap-ansi "^8.1.0"
     wrap-ansi-cjs "npm:wrap-ansi@^7.0.0"
 
-"@magicspace/core@^0.3.5":
-  version "0.3.5"
-  resolved "https://registry.yarnpkg.com/@magicspace/core/-/core-0.3.5.tgz#d3632f6f4ef912e538994fb350f0d78c464e6c76"
-  integrity sha512-40X5tHREEHtX7PyHolSILtxG8mjC6BNJvchJ+WC9PO8hl1WePrDgihanoeI/VCW/Q0OmtESHfadkbLVufqaQgQ==
+"@magicspace/core@^0.3.6":
+  version "0.3.6"
+  resolved "https://registry.yarnpkg.com/@magicspace/core/-/core-0.3.6.tgz#179835f8c5d9fb5a21883b5da0407650d03b48d3"
+  integrity sha512-QNoBU8tmvlS+xwr6RDTqkIOd835g9xurcWGbtV9rTxVN4iIgTb5ntnnLXMlr1szM6Eb/BHvo0ZP25XA5LsXkwg==
   dependencies:
     "@magicspace/utils" "^0.3.4"
     enhanced-resolve "^5.12.0"