The answer
A modern view that puts more weight on integration tests than the classic pyramid. Integration tests give high confidence at a reasonable cost, since they test multiple units working together without the slowness of E2E.
Unit vs Integration vs End-to-End Tests in a React App
What is the modern testing trophy?
More FAQs in Unit vs Integration vs End-to-End Tests in a React App
Unit tests test a single component or function in isolation. Integration tests test multiple units working together. End-to-end tests test the full app through a real browser, simulating real user journeys like login and checkout.
The classic guidance is many unit tests, fewer integration tests, and few E2E tests. Unit tests are cheap and fast; E2E tests are expensive and slow. A modern view puts more weight on integration tests, which give high confidence at reasonable cost.
A guidance that says have many unit tests at the base, fewer integration tests in the middle, and few end-to-end tests at the top. The shape reflects cost and speed: unit tests are cheap and fast, E2E tests are expensive and slow.
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