Testing Exercises

Testing Exercises

Build your testing skills with exercises covering table-driven tests, mocking, and HTTP handler testing.

Exercises in This Section

Exercise	Difficulty	Time	Description
Table-Driven Tests	Easy	15 min	Write comprehensive table-driven tests
Mocking with Interfaces	Medium	20 min	Create mocks for testing dependencies
HTTP Handler Testing	Medium	25 min	Test HTTP handlers with httptest

Key Concepts Covered

• Table-driven tests: Organizing test cases efficiently
• Subtests: Using t.Run() for organized test output
• Mocking: Creating test doubles using interfaces
• httptest: Testing HTTP handlers without a real server
• Test coverage: Measuring and improving test coverage

Prerequisites

Before starting these exercises, you should be comfortable with:

• Go interfaces
• Basic testing with go test
• Chapter 10: Testing Strategies

Tips

1. Use descriptive test case names that explain what’s being tested
2. Test edge cases and error conditions, not just happy paths
3. Keep tests independent - each test should set up its own state