What is a test suite?
Answer
A test suite is a collection of tests grouped together for execution. It can be organized by: feature/module (all tests for the User module), type (all unit tests, all integration tests), or team ownership. Test suites enable: (1) Running a specific subset of tests (fast feedback on a feature). (2) Parallel execution. (3) Targeted CI/CD stages (unit suite → integration suite → E2E suite). Most testing frameworks support grouping via naming conventions, tags/categories, or configuration: JUnit 5: @Tag("slow"). xUnit: trait-based filtering. pytest: markers (@pytest.mark.slow). NUnit: [Category("Integration")]. In CI pipelines, suites are often run in parallel to reduce total time: unit tests run on every commit (fast), integration tests on PR, E2E on main branch before deployment. A well-structured test suite is maintained like production code — poor organization leads to slow, brittle, hard-to-debug test runs.