switch from Jest to Vitest

.github/workflows/test.yml

@@ -47,7 +47,7 @@ jobs:
       -
         name: Check coverage
         run: |
-          if [ -f ./coverage/clover.xml ] && [ ! -f ./coverage/allSkipped.txt ]; then
+          if [ -f ./coverage/clover.xml ]; then
             echo "RUN_CODECOV=true" >> $GITHUB_ENV
           else
             echo "RUN_CODECOV=false" >> $GITHUB_ENV
@@ -205,7 +205,7 @@ jobs:
             if (testName) {
               args.push(`--testNamePattern=^${testName} `);
             }
-            args.push(`--runTestsByPath`, `__tests__/${{ matrix.test }}`, `--coverageDirectory=./coverage`);
+            args.push(`__tests__/${{ matrix.test }}`, `--coverage.reportsDirectory=./coverage`);
             await exec.exec('yarn', args);
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -217,7 +217,7 @@ jobs:
       -
         name: Check coverage
         run: |
-          if [ -f ./coverage/clover.xml ] && [ ! -f ./coverage/allSkipped.txt ]; then
+          if [ -f ./coverage/clover.xml ]; then
             echo "RUN_CODECOV=true" >> $GITHUB_ENV
           else
             echo "RUN_CODECOV=false" >> $GITHUB_ENV

__mocks__/@actions/github.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {jest} from '@jest/globals';
+import {vi} from 'vitest';
 
 export const context = {
   repo: {
@@ -221,4 +221,4 @@ export const context = {
   }
 };
 
-export const getOctokit = jest.fn();
+export const getOctokit = vi.fn();

__tests__/.helpers/os.ts

@@ -14,17 +14,17 @@
  * limitations under the License.
  */
 
-import {jest} from '@jest/globals';
+import {vi} from 'vitest';
 import os from 'os';
 
 export const mockPlatform = (platform: NodeJS.Platform) => {
-  return jest.spyOn(os, 'platform').mockImplementation(() => platform);
+  return vi.spyOn(os, 'platform').mockImplementation(() => platform);
 };
 
 export const mockArch = (arch: string) => {
-  return jest.spyOn(os, 'arch').mockImplementation(() => arch);
+  return vi.spyOn(os, 'arch').mockImplementation(() => arch);
 };
 
 export const mockHomedir = (dir: string) => {
-  return jest.spyOn(os, 'homedir').mockImplementation(() => dir);
+  return vi.spyOn(os, 'homedir').mockImplementation(() => dir);
 };

__tests__/.setup/list-itg-tests.mjs

@@ -0,0 +1,38 @@
+/**
+ * Copyright 2026 actions-toolkit authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+
+const testsRoot = path.resolve('__tests__');
+const results = [];
+
+const walk = dir => {
+  for (const entry of fs.readdirSync(dir, {withFileTypes: true})) {
+    const fullPath = path.join(dir, entry.name);
+    if (entry.isDirectory()) {
+      walk(fullPath);
+      continue;
+    }
+    if (entry.isFile() && entry.name.endsWith('.test.itg.ts')) {
+      results.push(fullPath.replaceAll(path.sep, '/'));
+    }
+  }
+};
+
+walk(testsRoot);
+results.sort((a, b) => a.localeCompare(b));
+process.stdout.write(`${results.join('\n')}\n`);

__tests__/.setup/setup.unit.ts

@@ -0,0 +1,33 @@
+/**
+ * Copyright 2026 actions-toolkit authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+
+const envTmpDir = process.env.DOCKER_ACTIONS_TOOLKIT_TMPDIR;
+const tmpDir = envTmpDir || fs.mkdtempSync(path.join(os.tmpdir(), 'docker-actions-toolkit-'));
+
+process.env = Object.assign({}, process.env, {
+  DOCKER_ACTIONS_TOOLKIT_TMPDIR: tmpDir,
+  TEMP: tmpDir,
+  GITHUB_REPOSITORY: 'docker/actions-toolkit',
+  GITHUB_RUN_ATTEMPT: '2',
+  GITHUB_RUN_ID: '2188748038',
+  GITHUB_RUN_NUMBER: '15',
+  RUNNER_TEMP: path.join(tmpDir, 'runner-temp'),
+  RUNNER_TOOL_CACHE: path.join(tmpDir, 'runner-tool-cache')
+});

__tests__/buildkit/buildkit.test.ts

@@ -14,14 +14,14 @@
  * limitations under the License.
  */
 
-import {describe, expect, it, jest, test} from '@jest/globals';
+import {describe, expect, it, vi, test} from 'vitest';
 
 import {BuildKit} from '../../src/buildkit/buildkit';
 import {Builder} from '../../src/buildx/builder';
 
 import {BuilderInfo} from '../../src/types/buildx/builder';
 
-jest.spyOn(Builder.prototype, 'inspect').mockImplementation(async (): Promise<BuilderInfo> => {
+vi.spyOn(Builder.prototype, 'inspect').mockImplementation(async (): Promise<BuilderInfo> => {
   return {
     name: 'builder2',
     driver: 'docker-container',

__tests__/buildkit/config.test.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {describe, expect, jest, test, afterEach} from '@jest/globals';
+import {describe, expect, vi, test, afterEach} from 'vitest';
 import fs from 'fs';
 import os from 'os';
 import path from 'path';
@@ -25,14 +25,14 @@ import {Context} from '../../src/context';
 
 const fixturesDir = path.join(__dirname, '..', '.fixtures');
 const tmpDir = fs.mkdtempSync(path.join(process.env.TEMP || os.tmpdir(), 'buildkit-config-'));
-const tmpName = path.join(tmpDir, '.tmpname-jest');
+const tmpName = path.join(tmpDir, '.tmpname-vi');
 
-jest.spyOn(Context, 'tmpDir').mockImplementation((): string => {
+vi.spyOn(Context, 'tmpDir').mockImplementation((): string => {
   fs.mkdirSync(tmpDir, {recursive: true});
   return tmpDir;
 });
 
-jest.spyOn(Context, 'tmpName').mockImplementation((): string => {
+vi.spyOn(Context, 'tmpName').mockImplementation((): string => {
   return tmpName;
 });
 
@@ -66,7 +66,7 @@ describe('resolve', () => {
       const configValue = fs.readFileSync(tmpName, 'utf-8');
       expect(configValue).toEqual(exValue);
     } catch (e) {
-      // eslint-disable-next-line jest/no-conditional-expect
+      // eslint-disable-next-line vitest/no-conditional-expect
       expect(e.message).toEqual(error?.message);
     }
   });

__tests__/buildkit/git.test.ts

@@ -14,14 +14,14 @@
  * limitations under the License.
  */
 
-import {beforeEach, describe, expect, jest, test} from '@jest/globals';
+import {beforeEach, describe, expect, vi, test} from 'vitest';
 
 import {Git} from '../../src/buildkit/git';
 
 import {GitRef, GitURL} from '../../src/types/buildkit/git';
 
 beforeEach(() => {
-  jest.restoreAllMocks();
+  vi.restoreAllMocks();
 });
 
 describe('parseURL', () => {
@@ -195,7 +195,7 @@ describe('parseURL', () => {
       if (!expectedErr) {
         console.log(err);
       }
-      // eslint-disable-next-line jest/no-conditional-expect
+      // eslint-disable-next-line vitest/no-conditional-expect
       expect(expectedErr).toBeTruthy();
     }
   });
@@ -337,7 +337,7 @@ describe('parseRef', () => {
       if (expected) {
         console.log(err);
       }
-      // eslint-disable-next-line jest/no-conditional-expect
+      // eslint-disable-next-line vitest/no-conditional-expect
       expect(expected).toBeUndefined();
     }
   });

__tests__/buildx/bake.test.itg.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {describe, expect, test} from '@jest/globals';
+import {describe, expect, test} from 'vitest';
 import * as fs from 'fs';
 import * as path from 'path';
 

__tests__/buildx/bake.test.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {afterEach, describe, expect, it, jest, test} from '@jest/globals';
+import {afterEach, describe, expect, it, vi, test} from 'vitest';
 import fs from 'fs';
 import os from 'os';
 import path from 'path';
@@ -29,15 +29,15 @@ import {BuildMetadata} from '../../src/types/buildx/build';
 
 const fixturesDir = path.join(__dirname, '..', '.fixtures');
 const tmpDir = fs.mkdtempSync(path.join(process.env.TEMP || os.tmpdir(), 'buildx-bake-'));
-const tmpName = path.join(tmpDir, '.tmpname-jest');
+const tmpName = path.join(tmpDir, '.tmpname-vi');
 const metadata = JSON.parse(fs.readFileSync(path.join(fixturesDir, 'metadata-bake.json'), 'utf-8'));
 
-jest.spyOn(Context, 'tmpDir').mockImplementation((): string => {
+vi.spyOn(Context, 'tmpDir').mockImplementation((): string => {
   fs.mkdirSync(tmpDir, {recursive: true});
   return tmpDir;
 });
 
-jest.spyOn(Context, 'tmpName').mockImplementation((): string => {
+vi.spyOn(Context, 'tmpName').mockImplementation((): string => {
   return tmpName;
 });
 

__tests__/buildx/build.test.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {afterEach, beforeEach, describe, expect, it, jest, test} from '@jest/globals';
+import {afterEach, beforeEach, describe, expect, it, vi, test} from 'vitest';
 import fs from 'fs';
 import os from 'os';
 import path from 'path';
@@ -25,15 +25,15 @@ import {Build} from '../../src/buildx/build';
 
 const fixturesDir = path.join(__dirname, '..', '.fixtures');
 const tmpDir = fs.mkdtempSync(path.join(process.env.TEMP || os.tmpdir(), 'buildx-build-'));
-const tmpName = path.join(tmpDir, '.tmpname-jest');
+const tmpName = path.join(tmpDir, '.tmpname-vi');
 const metadata = JSON.parse(fs.readFileSync(path.join(fixturesDir, 'metadata-build.json'), 'utf-8'));
 
-jest.spyOn(Context, 'tmpDir').mockImplementation((): string => {
+vi.spyOn(Context, 'tmpDir').mockImplementation((): string => {
   fs.mkdirSync(tmpDir, {recursive: true});
   return tmpDir;
 });
 
-jest.spyOn(Context, 'tmpName').mockImplementation((): string => {
+vi.spyOn(Context, 'tmpName').mockImplementation((): string => {
   return tmpName;
 });
 
@@ -191,7 +191,7 @@ describe('resolveSecret', () => {
       expect(secret).toEqual(`id=${exKey},src=${tmpName}`);
       expect(fs.readFileSync(tmpName, 'utf-8')).toEqual(exValue);
     } catch (e) {
-      // eslint-disable-next-line jest/no-conditional-expect
+      // eslint-disable-next-line vitest/no-conditional-expect
       expect(e.message).toEqual(error?.message);
     }
   });
@@ -206,7 +206,7 @@ describe('resolveSecret', () => {
       const secret = Build.resolveSecretEnv(kvp);
       expect(secret).toEqual(`id=${exKey},env=${exValue}`);
     } catch (e) {
-      // eslint-disable-next-line jest/no-conditional-expect
+      // eslint-disable-next-line vitest/no-conditional-expect
       expect(e.message).toEqual(error?.message);
     }
   });

__tests__/buildx/builder.test.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {describe, expect, it, jest, test} from '@jest/globals';
+import {describe, expect, it, vi, test} from 'vitest';
 import * as fs from 'fs';
 import * as path from 'path';
 
@@ -25,7 +25,7 @@ import {BuilderInfo} from '../../src/types/buildx/builder';
 
 const fixturesDir = path.join(__dirname, '..', '.fixtures');
 
-jest.spyOn(Builder.prototype, 'inspect').mockImplementation(async (): Promise<BuilderInfo> => {
+vi.spyOn(Builder.prototype, 'inspect').mockImplementation(async (): Promise<BuilderInfo> => {
   return {
     name: 'builder2',
     driver: 'docker-container',
@@ -46,7 +46,7 @@ jest.spyOn(Builder.prototype, 'inspect').mockImplementation(async (): Promise<Bu
 
 describe('exists', () => {
   it('valid', async () => {
-    const execSpy = jest.spyOn(Exec, 'getExecOutput');
+    const execSpy = vi.spyOn(Exec, 'getExecOutput');
     const builder = new Builder();
     await builder.exists('foo');
     expect(execSpy).toHaveBeenCalledWith(`docker`, ['buildx', 'inspect', 'foo'], {

__tests__/buildx/buildx.test.itg.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {describe, expect, it} from '@jest/globals';
+import {describe, expect, it} from 'vitest';
 import fs from 'fs';
 import os from 'os';
 import path from 'path';