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Conceptual overview of testing practices in JavaScript: goals, levels (unit, integration, end-to-end) and integration into CI/CD pipelines.
JavaScript testing encompasses techniques and practices to verify behavior, correctness, and regressions in JavaScript code across unit, integration and end-to-end levels. It includes test automation, assertions, mocking and CI integration, with emphasis on fast feedback, maintainable suites and pragmatic coverage. Teams should prioritise risks and embed tests into the development workflow.
Average time a defined test suite takes to complete.
Share of tests that intermittently fail without code changes.
Measure of how well tests detect real faults or behaviour changes.
Example use of Jest for isolated unit tests, snapshot testing and coverage measurement in a React project.
Integration tests validate API links between Node-based microservices using mocked backends and real databases in staging.
End-to-end tests automating real user flows in browsers, including authentication and visual checks.
Define test strategy (unit, integration, e2e) and priorities.
Set up test frameworks and CI integration (runners, reporters).
Automate and measure continuously; optimise suite performance.