Production · FOCUSED GUIDE
Learn Testing.
Choose useful tests and understand mocks, fixtures, and coverage.
YOUR LEARNING PATH
Testing essentials
Start with the essentials or pick the concept you need.
RECOMMENDED NEXTUnit vs integration vs E2E tests?
Start learningWhat you will study in Testing
Focused lessons organized by concept. Start with the explanation, trace the examples, and check your recall before moving on.
Testing
Unit tests check a small piece of logic, integration tests verify collaborating components, and E2E tests exercise a complete user or API flow. They catch different classes of failure and have different setup and execution costs. A balanced strategy puts detailed business-rule checks near the unit level and preserves real integration coverage where mocks would hide bugs.