Test Data Generation

Solid foundation for generating test data without hardcoding values everywhere. Covers the main approaches: factories with overrides for simple cases, builders for complex nested objects, fixtures for integration test setup, and faker libraries for realistic looking data. The examples show JavaScript but the patterns translate directly to other languages. Most useful when you're tired of maintaining brittle test data across dozens of test files or need to spin up varied test scenarios quickly. The factory pattern guide is the strongest part, though I wish there were more examples of handling relational data and unique constraints. Worth using if you're past the "just inline some objects" phase of testing.