testing_skill

Overview

This skill implements comprehensive testing and deployment workflows for Angular applications. It covers unit and component tests, Cypress E2E suites with page objects, test mocking strategies, build optimization, CI/CD pipeline configuration, and multi-target deployment. The goal is stable releases, reliable test coverage, and reproducible production builds.

How this skill works

I write and organize unit tests using Angular TestBed, Jasmine/Karma patterns, and async testing helpers (fakeAsync, tick, waitForAsync). For integration and E2E I implement Cypress tests and a Page Object Model to keep suites maintainable. I add HTTP and service mocks to isolate units, configure production builds (AOT, optimization, code splitting), and wire CI/CD pipelines (GitHub Actions) to run lint, build, tests, coverage, and deploy stages.

When to use it

• When adding or refactoring components and services to ensure behavior is covered
• Before merging feature branches to run automated unit and E2E checks
• When preparing production releases to optimize bundles and verify performance
• When adopting CI/CD to automate test, build, and deployment steps
• When you need repeatable test mocks to isolate external APIs

Best practices

• Structure tests with Arrange-Act-Assert and keep tests focused
• Mock external dependencies (HTTP, services) to avoid flaky network calls
• Prefer one logical assertion per test and cover error cases as well as success paths
• Use Page Object Model in Cypress to reduce duplication and improve readability
• Enable AOT, optimization, and output hashing for production builds

Example use cases

• Create TestBed unit tests for services using HttpClientTestingModule and HttpTestingController
• Add component specs that spy on injected services and assert DOM updates
• Write Cypress E2E flows: navigation, filtering, detail pages, using data-testid selectors
• Analyze bundles with webpack-bundle-analyzer and implement route-based code splitting
• Configure GitHub Actions to run lint, build, unit tests, E2E, upload coverage, and deploy on main