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Sample input or data used to make a test repeatable.
Fixtures give tests known starting conditions. They are useful for JSON examples, database rows, user sessions, and edge cases.
Plainly
Think of Fixture as a simple recipe for doing the work better. Sample input or data used to make a test repeatable.
In practice
Use it when you need a repeatable method instead of guessing from vibes. In practice, define the owner, input, output, and failure mode before you rely on it.