tdd

Structure unit tests in TypeScript using Vitest by co-locating test files with source code and organizing them in a flat single-array test structure. This enforces consistent test quality and clearer module isolation across your project.

Test-driven development best practices in TypeScript involve writing deterministic, pure functions and co-locating tests with sources. Following consistent guidelines ensures reliable unit tests and quick iteration cycles during development.

Co-locating tests with source files is a strict structural requirement for this TDD approach. It ensures reliable unit tests and quick iteration by keeping test logic directly adjacent to the TypeScript modules it validates.

Apply TDD rules to a new TypeScript module by using provided templates and core patterns to structure tests. This involves writing deterministic pure functions and co-locating the test files within your Vitest project.

This TDD methodology emphasizes writing deterministic, pure functions to maintain reliable unit tests. While it targets pure functions, the structural guidelines and clear error handling patterns can guide testing for complex scenarios.