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// TDD Test: Verify Docker image builds successfully // This test MUST FAIL first to prove we need proper Docker setup import { describe, it, expect, jest } from '@jest/globals'; import { readFileSync, existsSync } from 'fs'; import { join, dirname } from 'path'; import { fileURLToPath } from 'url'; import { exec } from 'child_process'; import { promisify } from 'util'; const execAsync = promisify(exec); const __filename = fileURLToPath(import.meta.url); const __dirname = dirname(__filename); const projectRoot = join(__dirname, '..'); describe('Docker Build Process', () => { it('should have valid Dockerfile with correct structure', () => { const dockerfilePath = join(projectRoot, 'Dockerfile'); expect(existsSync(dockerfilePath)).toBe(true); const dockerfile = readFileSync(dockerfilePath, 'utf-8'); // Should start with FROM expect(dockerfile).toMatch(/^FROM\s+node:/m); // Should set working directory expect(dockerfile).toMatch(/WORKDIR\s+/); // Should copy package files expect(dockerfile).toMatch(/COPY\s+package.*\.json/); // Should run npm install expect(dockerfile).toMatch(/RUN\s+npm\s+(install|ci)/); // Should copy source code expect(dockerfile).toMatch(/COPY\s+(\.\s+\.|src)/); // Should expose port or define CMD expect(dockerfile).toMatch(/EXPOSE\s+\d+|CMD\s+/); }); it('should have .dockerignore file to exclude unnecessary files', () => { const dockerignorePath = join(projectRoot, '.dockerignore'); expect(existsSync(dockerignorePath)).toBe(true); const dockerignore = readFileSync(dockerignorePath, 'utf-8'); // Should ignore node_modules expect(dockerignore).toMatch(/node_modules/); // Should ignore npm debug logs expect(dockerignore).toMatch(/npm-debug\.log/); // Should ignore .git expect(dockerignore).toMatch(/\.git/); // Should ignore README and docs expect(dockerignore).toMatch(/README|\*\.md/); }); it('should use appropriate Node.js base image', () => { const dockerfilePath = join(projectRoot, 'Dockerfile'); if (existsSync(dockerfilePath)) { const dockerfile = readFileSync(dockerfilePath, 'utf-8'); // Should use official Node.js image expect(dockerfile).toMatch(/FROM\s+node:(18|20|latest|lts)/); // Should use alpine or slim for smaller size (optional but recommended) const hasOptimizedImage = dockerfile.match(/FROM\s+node:(18|20|latest|lts)-(alpine|slim)/); // This is a recommendation, not a requirement if (hasOptimizedImage) { expect(hasOptimizedImage).toBeTruthy(); } } }); it('should have proper build arguments and environment variables', () => { const dockerfilePath = join(projectRoot, 'Dockerfile'); if (existsSync(dockerfilePath)) { const dockerfile = readFileSync(dockerfilePath, 'utf-8'); // Should set NODE_ENV for production builds const hasNodeEnv = dockerfile.includes('NODE_ENV=production') || dockerfile.includes('ENV NODE_ENV'); expect(hasNodeEnv).toBe(true); } }); it('should create proper directory structure in container', () => { const dockerfilePath = join(projectRoot, 'Dockerfile'); if (existsSync(dockerfilePath)) { const dockerfile = readFileSync(dockerfilePath, 'utf-8'); // Should set a working directory expect(dockerfile).toMatch(/WORKDIR\s+\/app|WORKDIR\s+\/usr\/src\/app/); // Should create app user for security (recommended) const hasUserSetup = dockerfile.includes('RUN addgroup') || dockerfile.includes('USER node') || dockerfile.includes('RUN useradd'); // This is a security best practice if (hasUserSetup) { expect(hasUserSetup).toBe(true); } } }); it('should handle npm install efficiently', () => { const dockerfilePath = join(projectRoot, 'Dockerfile'); if (existsSync(dockerfilePath)) { const dockerfile = readFileSync(dockerfilePath, 'utf-8'); // Should copy package.json first for better caching const packageCopyLine = dockerfile.match(/COPY\s+package.*\.json/); const npmInstallLine = dockerfile.match(/RUN\s+npm\s+(install|ci)/); const sourceCopyLine = dockerfile.match(/COPY\s+(\.\s+\.|src)/); if (packageCopyLine && npmInstallLine && sourceCopyLine) { // Package copy should come before npm install expect(dockerfile.indexOf(packageCopyLine[0])).toBeLessThan( dockerfile.indexOf(npmInstallLine[0]) ); // npm install should come before source copy expect(dockerfile.indexOf(npmInstallLine[0])).toBeLessThan( dockerfile.indexOf(sourceCopyLine[0]) ); } } }); it('should build without errors', async () => { // This test will fail initially if Docker setup is incorrect const dockerfilePath = join(projectRoot, 'Dockerfile'); if (existsSync(dockerfilePath)) { try { // Test that docker build command would work // (We'll mock this since we might not have Docker in CI) const buildCommand = 'docker build -t test-app .'; // Simulate what should happen in a real build const expectedBuildSteps = [ 'FROM node', 'WORKDIR', 'COPY package', 'RUN npm', 'COPY', 'CMD' ]; const dockerfile = readFileSync(dockerfilePath, 'utf-8'); expectedBuildSteps.forEach(step => { expect(dockerfile.toUpperCase()).toContain(step.toUpperCase()); }); } catch (error) { // This should fail initially, proving we need proper Docker setup expect(error).toBeDefined(); } } }, 30000); it('should have multi-stage build for optimization (optional)', () => { const dockerfilePath = join(projectRoot, 'Dockerfile'); if (existsSync(dockerfilePath)) { const dockerfile = readFileSync(dockerfilePath, 'utf-8'); // Multi-stage builds are optional but recommended const hasMultiStage = dockerfile.match(/FROM.*AS\s+\w+/i); if (hasMultiStage) { expect(dockerfile).toMatch(/FROM.*AS\s+builder/i); expect(dockerfile).toMatch(/COPY\s+--from=builder/); } } }); it('should have health check for container monitoring', () => { const dockerfilePath = join(projectRoot, 'Dockerfile'); if (existsSync(dockerfilePath)) { const dockerfile = readFileSync(dockerfilePath, 'utf-8'); // Health check is optional but recommended for services const hasHealthCheck = dockerfile.includes('HEALTHCHECK'); if (hasHealthCheck) { expect(dockerfile).toMatch(/HEALTHCHECK\s+--interval=.*CMD/); } } }); });