Vitest MCP Server

import { describe, it, expect, vi, beforeEach } from 'vitest'; import { handleAnalyzeCoverage } from '../analyze-coverage.js'; import { projectContext } from '../../context/project-context.js'; import * as fileUtils from '../../utils/file-utils.js'; import * as configLoader from '../../config/config-loader.js'; import * as versionChecker from '../../utils/version-checker.js'; import { spawn } from 'child_process'; import { EventEmitter } from 'events'; // Mock external dependencies vi.mock('child_process'); vi.mock('../../utils/file-utils.js'); vi.mock('../../config/config-loader.js'); vi.mock('../../utils/version-checker.js'); vi.mock('../../context/project-context.js'); vi.mock('fs/promises'); describe('analyze-coverage (CJS warning handling)', () => { let mockChildProcess: any; beforeEach(() => { vi.clearAllMocks(); // Setup default mocks vi.mocked(projectContext.getProjectRoot).mockReturnValue('/test/project'); vi.mocked(fileUtils.fileExists).mockResolvedValue(true); vi.mocked(fileUtils.isDirectory).mockResolvedValue(false); vi.mocked(configLoader.getConfig).mockResolvedValue({ coverageDefaults: { format: 'summary' as const, threshold: 80 }, testDefaults: { timeout: 30000, format: 'summary' as const } } as any); vi.mocked(versionChecker.checkAllVersions).mockResolvedValue({ errors: [], warnings: [], coverageProvider: { version: '1.0.0' } } as any); // Create mock child process mockChildProcess = new EventEmitter() as any; mockChildProcess.stdout = new EventEmitter(); mockChildProcess.stderr = new EventEmitter(); mockChildProcess.kill = vi.fn(); mockChildProcess.killed = false; vi.mocked(spawn).mockReturnValue(mockChildProcess); }); it('should filter out Vite CJS deprecation warning from stderr', async () => { // Arrange const args = { target: './src/utils.ts', format: 'summary' as const }; // Act - Start the coverage analysis const coveragePromise = handleAnalyzeCoverage(args); // Simulate command output with CJS warning in stderr but valid coverage data setTimeout(() => { // Emit the CJS deprecation warning in stderr mockChildProcess.stderr.emit('data', Buffer.from( '\x1b[33mThe CJS build of Vite\'s Node API is deprecated. See https://vite.dev/guide/troubleshooting.html#vite-cjs-node-api-deprecated for more details.\x1b[39m\n' )); // Emit valid coverage data in stdout mockChildProcess.stdout.emit('data', Buffer.from(JSON.stringify({ coverageMap: { '/test/project/src/utils.ts': { path: '/test/project/src/utils.ts', statementMap: {}, fnMap: {}, branchMap: {}, s: { '0': 1 }, f: { '0': 1 }, b: {} } } }))); mockChildProcess.emit('close', 0); }, 10); const result = await coveragePromise; // Assert - The result should be successful despite the warning expect(result.success).toBe(true); expect(result.error).toBeUndefined(); expect(result.coverage).toBeDefined(); }); it('should handle real errors along with CJS warning', async () => { // Arrange const args = { target: './src/utils.ts', format: 'summary' as const }; // Act - Start the coverage analysis const coveragePromise = handleAnalyzeCoverage(args); // Simulate command output with CJS warning AND a real error setTimeout(() => { // Emit the CJS warning followed by a real error mockChildProcess.stderr.emit('data', Buffer.from( '\x1b[33mThe CJS build of Vite\'s Node API is deprecated. See https://vite.dev/guide/troubleshooting.html#vite-cjs-node-api-deprecated for more details.\x1b[39m\n' + 'Error: Coverage provider not found\n' )); // No stdout data mockChildProcess.stdout.emit('data', Buffer.from('')); mockChildProcess.emit('close', 1); }, 10); const result = await coveragePromise; // Assert - The real error should be preserved expect(result.success).toBe(false); expect(result.error).toContain('Coverage provider not found'); expect(result.error).not.toContain('CJS build'); }); it('should set VITE_CJS_IGNORE_WARNING environment variable', async () => { // Arrange const args = { target: './src/utils.ts' }; // Act - Start the coverage analysis const coveragePromise = handleAnalyzeCoverage(args); // Simulate successful execution setTimeout(() => { mockChildProcess.stdout.emit('data', Buffer.from('{}')); mockChildProcess.emit('close', 0); }, 10); await coveragePromise; // Assert - Check that spawn was called with the environment variable expect(spawn).toHaveBeenCalled(); const spawnCall = vi.mocked(spawn).mock.calls[0]; const [, , options] = spawnCall; expect(options?.env?.VITE_CJS_IGNORE_WARNING).toBe('true'); }); });