Assertion - CI/CD Glossary Definition

An assertion is a check inside a test that compares an actual value to an expected one and fails the test if they differ, for example assertEqual(actual, expected) or expect(x).toBe(y).

Failure messages

A good assertion produces a diff showing expected vs actual, which is what you read first when a CI job fails. Prefer specific assertions (toEqual) over generic truthiness (assertTrue) for clearer failures.

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