A System for Writing Tests That Actually Work
Build the skill of catching bugs before they reach production. Learn the patterns, principles, and tools that turn testing from a chore into an advantage.
What You'll Actually Learn
This isn't a survey course. We focus on practical techniques you'll use immediately, starting with fundamentals and building toward advanced patterns that solve real problems.
Testing Fundamentals
Start with the basics that actually matter. Understand what makes a test valuable versus what just creates maintenance burden.
- Writing your first unit test from scratch
- Assertions that catch real issues
- Structure patterns for clarity
- When to test and when not to
Mocking and Isolation
Learn to isolate code under test without creating fragile test suites that break whenever you refactor.
- Stubs, mocks, and fakes explained
- Dependency injection patterns
- Testing code with external calls
- Avoiding over-mocking traps
Test Organization
Structure test suites that scale as your codebase grows. Keep tests fast, focused, and easy to navigate.
- File structure that makes sense
- Naming conventions that work
- Setup and teardown strategies
- Grouping related tests effectively
Testing Patterns
Apply proven patterns to common scenarios. Handle edge cases, asynchronous code, and complex state without losing clarity.
- Testing async operations properly
- Handling timers and delays
- Parameterized test approaches
- Data-driven testing techniques
Integration Testing
Move beyond unit tests to verify how components work together. Test interactions without sacrificing speed.
- Database testing strategies
- API endpoint verification
- Component integration checks
- Test data management
Test Maintenance
Keep tests valuable as code evolves. Refactor tests without losing coverage. Identify and fix flaky tests.
- Refactoring test code safely
- Dealing with flaky tests
- Code coverage interpretation
- Mobile app testing considerations
How the Program Works
Foundation Week
Get set up with testing frameworks and write your first meaningful tests. Focus on syntax and basic patterns that apply everywhere.
Practical Application
Apply techniques to real codebases. Work through scenarios with databases, APIs, and external services. Learn to make informed tradeoffs.
Advanced Patterns
Handle complex cases like testing legacy code, dealing with race conditions, and building test suites that scale with your team.
Integration Project
Build a complete test suite for a multi-component system. Demonstrate understanding through practical implementation and code review.
Tools and Frameworks We Cover
You'll work with the testing frameworks and libraries that professionals actually use. While we focus on principles that transfer across tools, you'll gain hands-on experience with current industry standards.
The mobile recharge section includes practical examples of testing payment flows and transaction handling. We also cover mobile app testing scenarios relevant to modern development.
Testing Frameworks
Jest, Mocha, and pytest for different environments. Learn when each makes sense and how to configure them for your needs.
Mocking Libraries
Sinon, unittest.mock, and built-in framework tools. Understand what each offers and avoid common pitfalls.
Coverage Analysis
Istanbul, Coverage.py, and interpreting metrics correctly. Learn what coverage numbers actually tell you.
CI/CD Integration
Running tests automatically in pipelines. Set up fast feedback loops that catch issues before merge.
Start Writing Better Tests
Join the next cohort and build practical testing skills over six focused weeks. Enrollment is open and classes start soon.
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