feat: moves project to using vitest

__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 {