feat: moves project to using vitest

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
 
       - name: Test
         id: npm-ci-test
-        run: npm run ci-test
+        run: npm run test
         env:
           GITHUB_TOKEN: ${{ github.token }}
 

__fixtures__/core.ts

@@ -1,11 +1,11 @@
 import type * as core from '@actions/core'
-import { jest } from '@jest/globals'
+import { vi } from 'vitest'
 
-export const debug = jest.fn<typeof core.debug>()
-export const error = jest.fn<typeof core.error>()
-export const info = jest.fn<typeof core.info>()
-export const getInput = jest.fn<typeof core.getInput>()
-export const getBooleanInput = jest.fn<typeof core.getBooleanInput>()
-export const setOutput = jest.fn<typeof core.setOutput>()
-export const setFailed = jest.fn<typeof core.setFailed>()
-export const warning = jest.fn<typeof core.warning>()
+export const debug = vi.fn<typeof core.debug>()
+export const error = vi.fn<typeof core.error>()
+export const info = vi.fn<typeof core.info>()
+export const getInput = vi.fn<typeof core.getInput>()
+export const getBooleanInput = vi.fn<typeof core.getBooleanInput>()
+export const setOutput = vi.fn<typeof core.setOutput>()
+export const setFailed = vi.fn<typeof core.setFailed>()
+export const warning = vi.fn<typeof core.warning>()

__fixtures__/wait.ts

@@ -1,3 +1,3 @@
-import { jest } from '@jest/globals'
+import { vi } from 'vitest'
 
-export const wait = jest.fn<typeof import('../src/wait.js').wait>()
+export const wait = vi.fn<typeof import('../src/wait.js').wait>()

__tests__/helpers-inference.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect } from '@jest/globals'
+import { describe, it, expect } from 'vitest'
 import {
   buildMessages,
   buildResponseFormat,

__tests__/helpers.test.ts

@@ -1,26 +1,21 @@
-/**
- * Unit tests for the helpers module, src/helpers.ts
- */
-import { jest } from '@jest/globals'
+import { vi, it, expect, beforeEach, describe } from 'vitest'
 import * as core from '../__fixtures__/core.js'
 
-// Mock fs module
-const mockExistsSync = jest.fn()
-const mockReadFileSync = jest.fn()
+const mockExistsSync = vi.fn()
+const mockReadFileSync = vi.fn()
 
-jest.unstable_mockModule('fs', () => ({
+vi.mock('fs', () => ({
   existsSync: mockExistsSync,
   readFileSync: mockReadFileSync
 }))
 
-jest.unstable_mockModule('@actions/core', () => core)
+vi.mock('@actions/core', () => core)
 
-// Import the module being tested
 const { loadContentFromFileOrInput } = await import('../src/helpers.js')
 
 describe('helpers.ts', () => {
   beforeEach(() => {
-    jest.clearAllMocks()
+    vi.clearAllMocks()
   })
 
   describe('loadContentFromFileOrInput', () => {

__tests__/inference.test.ts

@@ -1,32 +1,34 @@
-/**
- * Unit tests for the inference module, src/inference.ts
- */
-import { jest } from '@jest/globals'
+import {
+  vi,
+  type MockedFunction,
+  beforeEach,
+  expect,
+  describe,
+  it
+} from 'vitest'
 import * as core from '../__fixtures__/core.js'
 
-// Mock Azure AI Inference
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-const mockPost = jest.fn() as jest.MockedFunction<any>
-const mockPath = jest.fn(() => ({ post: mockPost }))
-const mockClient = jest.fn(() => ({ path: mockPath }))
+const mockPost = vi.fn() as MockedFunction<any>
+const mockPath = vi.fn(() => ({ post: mockPost }))
+const mockClient = vi.fn(() => ({ path: mockPath }))
 
-jest.unstable_mockModule('@azure-rest/ai-inference', () => ({
+vi.mock('@azure-rest/ai-inference', () => ({
   default: mockClient,
-  isUnexpected: jest.fn(() => false)
+  isUnexpected: vi.fn(() => false)
 }))
 
-jest.unstable_mockModule('@azure/core-auth', () => ({
-  AzureKeyCredential: jest.fn()
+vi.mock('@azure/core-auth', () => ({
+  AzureKeyCredential: vi.fn()
 }))
 
-// Mock MCP functions
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-const mockExecuteToolCalls = jest.fn() as jest.MockedFunction<any>
-jest.unstable_mockModule('../src/mcp.js', () => ({
+const mockExecuteToolCalls = vi.fn() as MockedFunction<any>
+vi.mock('../src/mcp.js', () => ({
   executeToolCalls: mockExecuteToolCalls
 }))
 
-jest.unstable_mockModule('@actions/core', () => core)
+vi.mock('@actions/core', () => core)
 
 // Import the module being tested
 const { simpleInference, mcpInference } = await import('../src/inference.js')
@@ -44,7 +46,7 @@ describe('inference.ts', () => {
   }
 
   beforeEach(() => {
-    jest.clearAllMocks()
+    vi.clearAllMocks()
   })
 
   describe('simpleInference', () => {

__tests__/main-prompt-integration.test.ts

@@ -1,38 +1,46 @@
-import { describe, it, expect, beforeEach, jest } from '@jest/globals'
+import {
+  describe,
+  it,
+  expect,
+  beforeEach,
+  vi,
+  type MockedFunction,
+  type Mock
+} from 'vitest'
 import * as core from '../__fixtures__/core.js'
 
 // Create fs mocks
-const mockExistsSync = jest.fn()
-const mockReadFileSync = jest.fn()
-const mockWriteFileSync = jest.fn()
+const mockExistsSync = vi.fn()
+const mockReadFileSync = vi.fn()
+const mockWriteFileSync = vi.fn()
 
 // Create inference mocks
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-const mockSimpleInference = jest.fn() as jest.MockedFunction<any>
-const mockMcpInference = jest.fn()
+const mockSimpleInference = vi.fn() as MockedFunction<any>
+const mockMcpInference = vi.fn()
 
 // Create MCP mocks
-const mockConnectToGitHubMCP = jest.fn()
+const mockConnectToGitHubMCP = vi.fn()
 
 // Mock fs module
-jest.unstable_mockModule('fs', () => ({
+vi.mock('fs', () => ({
   existsSync: mockExistsSync,
   readFileSync: mockReadFileSync,
   writeFileSync: mockWriteFileSync
 }))
 
 // Mock the inference functions
-jest.unstable_mockModule('../src/inference.js', () => ({
+vi.mock('../src/inference.js', () => ({
   simpleInference: mockSimpleInference,
   mcpInference: mockMcpInference
 }))
 
 // Mock the MCP connection
-jest.unstable_mockModule('../src/mcp.js', () => ({
+vi.mock('../src/mcp.js', () => ({
   connectToGitHubMCP: mockConnectToGitHubMCP
 }))
 
-jest.unstable_mockModule('@actions/core', () => core)
+vi.mock('@actions/core', () => core)
 
 // The module being tested should be imported dynamically. This ensures that the
 // mocks are used in place of any actual dependencies.
@@ -40,7 +48,7 @@ const { run } = await import('../src/main.js')
 
 describe('main.ts - prompt.yml integration', () => {
   beforeEach(() => {
-    jest.clearAllMocks()
+    vi.clearAllMocks()
 
     // Mock environment variables
     process.env['GITHUB_TOKEN'] = 'test-token'
@@ -62,7 +70,7 @@ describe('main.ts - prompt.yml integration', () => {
     })
 
     // Mock core.getBooleanInput
-    const mockGetBooleanInput = core.getBooleanInput as jest.Mock
+    const mockGetBooleanInput = core.getBooleanInput as Mock
     mockGetBooleanInput.mockReturnValue(false)
 
     // Mock fs.readFileSync for prompt file

__tests__/main.test.ts

@@ -1,21 +1,25 @@
-/**
- * Unit tests for the action's main functionality, src/main.ts
- */
-import { jest } from '@jest/globals'
+import {
+  vi,
+  describe,
+  expect,
+  it,
+  beforeEach,
+  type MockedFunction
+} from 'vitest'
 import * as core from '../__fixtures__/core.js'
 
 // Default to throwing errors to catch unexpected calls
-const mockExistsSync = jest.fn().mockImplementation(() => {
+const mockExistsSync = vi.fn().mockImplementation(() => {
   throw new Error(
     'Unexpected call to existsSync - test should override this implementation'
   )
 })
-const mockReadFileSync = jest.fn().mockImplementation(() => {
+const mockReadFileSync = vi.fn().mockImplementation(() => {
   throw new Error(
     'Unexpected call to readFileSync - test should override this implementation'
   )
 })
-const mockWriteFileSync = jest.fn()
+const mockWriteFileSync = vi.fn()
 
 /**
  * Helper function to mock file system operations for one or more files
@@ -83,7 +87,7 @@ function verifyStandardResponse(): void {
   )
 }
 
-jest.unstable_mockModule('fs', () => ({
+vi.mock('fs', () => ({
   existsSync: mockExistsSync,
   readFileSync: mockReadFileSync,
   writeFileSync: mockWriteFileSync
@@ -91,22 +95,22 @@ jest.unstable_mockModule('fs', () => ({
 
 // Mock MCP and inference modules
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-const mockConnectToGitHubMCP = jest.fn() as jest.MockedFunction<any>
+const mockConnectToGitHubMCP = vi.fn() as MockedFunction<any>
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-const mockSimpleInference = jest.fn() as jest.MockedFunction<any>
+const mockSimpleInference = vi.fn() as MockedFunction<any>
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-const mockMcpInference = jest.fn() as jest.MockedFunction<any>
+const mockMcpInference = vi.fn() as MockedFunction<any>
 
-jest.unstable_mockModule('../src/mcp.js', () => ({
+vi.mock('../src/mcp.js', () => ({
   connectToGitHubMCP: mockConnectToGitHubMCP
 }))
 
-jest.unstable_mockModule('../src/inference.js', () => ({
+vi.mock('../src/inference.js', () => ({
   simpleInference: mockSimpleInference,
   mcpInference: mockMcpInference
 }))
 
-jest.unstable_mockModule('@actions/core', () => core)
+vi.mock('@actions/core', () => core)
 
 // The module being tested should be imported dynamically. This ensures that the
 // mocks are used in place of any actual dependencies.
@@ -115,7 +119,7 @@ const { run } = await import('../src/main.js')
 describe('main.ts', () => {
   // Reset all mocks before each test
   beforeEach(() => {
-    jest.clearAllMocks()
+    vi.clearAllMocks()
 
     // Remove any existing GITHUB_TOKEN
     delete process.env.GITHUB_TOKEN

__tests__/mcp.test.ts

@@ -1,16 +1,20 @@
-/**
- * Unit tests for the MCP module, src/mcp.ts
- */
-import { jest } from '@jest/globals'
+import {
+  vi,
+  type MockedFunction,
+  describe,
+  it,
+  expect,
+  beforeEach
+} from 'vitest'
 import * as core from '../__fixtures__/core.js'
 
 // Mock MCP SDK
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-const mockConnect = jest.fn() as jest.MockedFunction<any>
+const mockConnect = vi.fn() as MockedFunction<any>
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-const mockListTools = jest.fn() as jest.MockedFunction<any>
+const mockListTools = vi.fn() as MockedFunction<any>
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-const mockCallTool = jest.fn() as jest.MockedFunction<any>
+const mockCallTool = vi.fn() as MockedFunction<any>
 
 const mockClient = {
   connect: mockConnect,
@@ -19,18 +23,15 @@ const mockClient = {
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
 } as any
 
-jest.unstable_mockModule('@modelcontextprotocol/sdk/client/index.js', () => ({
-  Client: jest.fn(() => mockClient)
+vi.mock('@modelcontextprotocol/sdk/client/index.js', () => ({
+  Client: vi.fn(() => mockClient)
 }))
 
-jest.unstable_mockModule(
-  '@modelcontextprotocol/sdk/client/streamableHttp.js',
-  () => ({
-    StreamableHTTPClientTransport: jest.fn()
-  })
-)
+vi.mock('@modelcontextprotocol/sdk/client/streamableHttp.js', () => ({
+  StreamableHTTPClientTransport: vi.fn()
+}))
 
-jest.unstable_mockModule('@actions/core', () => core)
+vi.mock('@actions/core', () => core)
 
 // Import the module being tested
 const { connectToGitHubMCP, executeToolCall, executeToolCalls } = await import(
@@ -39,7 +40,7 @@ const { connectToGitHubMCP, executeToolCall, executeToolCalls } = await import(
 
 describe('mcp.ts', () => {
   beforeEach(() => {
-    jest.clearAllMocks()
+    vi.clearAllMocks()
   })
 
   describe('connectToGitHubMCP', () => {

__tests__/prompt.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect } from '@jest/globals'
+import { describe, it, expect } from 'vitest'
 import * as path from 'path'
 import { fileURLToPath } from 'url'
 import {

eslint.config.mjs

@@ -1,12 +1,9 @@
 // See: https://eslint.org/docs/latest/use/configure/configuration-files
 
-import { fixupPluginRules } from '@eslint/compat'
 import { FlatCompat } from '@eslint/eslintrc'
 import js from '@eslint/js'
 import typescriptEslint from '@typescript-eslint/eslint-plugin'
 import tsParser from '@typescript-eslint/parser'
-import _import from 'eslint-plugin-import'
-import jest from 'eslint-plugin-jest'
 import prettier from 'eslint-plugin-prettier'
 import globals from 'globals'
 import path from 'node:path'
@@ -28,13 +25,10 @@ export default [
     'eslint:recommended',
     'plugin:@typescript-eslint/eslint-recommended',
     'plugin:@typescript-eslint/recommended',
-    'plugin:jest/recommended',
     'plugin:prettier/recommended'
   ),
   {
     plugins: {
-      import: fixupPluginRules(_import),
-      jest,
       prettier,
       '@typescript-eslint': typescriptEslint
     },
@@ -42,7 +36,6 @@ export default [
     languageOptions: {
       globals: {
         ...globals.node,
-        ...globals.jest,
         Atomics: 'readonly',
         SharedArrayBuffer: 'readonly'
       },

jest.config.js

@@ -1,40 +0,0 @@
-// See: https://jestjs.io/docs/configuration
-
-/** @type {import('ts-jest').JestConfigWithTsJest} **/
-export default {
-  clearMocks: true,
-  collectCoverage: true,
-  collectCoverageFrom: ['./src/**'],
-  coverageDirectory: './coverage',
-  coveragePathIgnorePatterns: ['/node_modules/', '/dist/'],
-  coverageReporters: ['json-summary', 'text', 'lcov'],
-  // Uncomment the below lines if you would like to enforce a coverage threshold
-  // for your action. This will fail the build if the coverage is below the
-  // specified thresholds.
-  // coverageThreshold: {
-  //   global: {
-  //     branches: 100,
-  //     functions: 100,
-  //     lines: 100,
-  //     statements: 100
-  //   }
-  // },
-  extensionsToTreatAsEsm: ['.ts'],
-  moduleFileExtensions: ['ts', 'js'],
-  preset: 'ts-jest',
-  reporters: ['default'],
-  resolver: 'ts-jest-resolver',
-  testEnvironment: 'node',
-  testMatch: ['**/*.test.ts'],
-  testPathIgnorePatterns: ['/dist/', '/node_modules/'],
-  transform: {
-    '^.+\\.ts$': [
-      'ts-jest',
-      {
-        tsconfig: 'tsconfig.eslint.json',
-        useESM: true
-      }
-    ]
-  },
-  verbose: true
-}

package.json

@@ -10,7 +10,6 @@
   },
   "scripts": {
     "bundle": "npm run format:write && npm run package",
-    "ci-test": "NODE_OPTIONS=--experimental-vm-modules NODE_NO_WARNINGS=1 npx jest",
     "coverage": "npx make-coverage-badge --output-path ./badges/coverage.svg",
     "format:write": "npx prettier --write .",
     "format:check": "npx prettier --check .",
@@ -18,7 +17,8 @@
     "local-action": "npx @github/local-action . src/main.ts .env",
     "package": "npx rollup --config rollup.config.ts --configPlugin @rollup/plugin-typescript",
     "package:watch": "npm run package -- --watch",
-    "test": "npx cross-env NODE_OPTIONS=--experimental-vm-modules NODE_NO_WARNINGS=1 npx jest",
+    "test": "vitest --run",
+    "test:watch": "vitest --watch",
     "all": "npm run format:write && npm run lint && npm run test && npm run coverage && npm run package"
   },
   "license": "MIT",
@@ -36,11 +36,9 @@
     "@azure/core-sse": "latest",
     "@eslint/compat": "^1.3.0",
     "@github/local-action": "^5.1.0",
-    "@jest/globals": "^30.0.2",
     "@rollup/plugin-commonjs": "^28.0.5",
     "@rollup/plugin-node-resolve": "^16.0.1",
     "@rollup/plugin-typescript": "^12.1.2",
-    "@types/jest": "^30.0.0",
     "@types/node": "^22.15.31",
     "@typescript-eslint/eslint-plugin": "^8.34.0",
     "@typescript-eslint/parser": "^8.32.1",
@@ -48,16 +46,13 @@
     "eslint-config-prettier": "^10.1.5",
     "eslint-import-resolver-typescript": "^4.4.3",
     "eslint-plugin-import": "^2.31.0",
-    "eslint-plugin-jest": "^28.14.0",
     "eslint-plugin-prettier": "^5.4.1",
-    "jest": "^30.0.4",
     "make-coverage-badge": "^1.2.0",
     "prettier": "^3.5.3",
     "prettier-eslint": "^16.4.2",
     "rollup": "^4.43.0",
-    "ts-jest": "^29.4.0",
-    "ts-jest-resolver": "^2.0.1",
-    "typescript": "^5.8.3"
+    "typescript": "^5.8.3",
+    "vitest": "^3"
   },
   "optionalDependencies": {
     "@rollup/rollup-linux-x64-gnu": "*"

tsconfig.eslint.json

@@ -11,7 +11,6 @@
     "__tests__",
     "src",
     "eslint.config.mjs",
-    "jest.config.js",
     "rollup.config.ts"
   ]
 }