add: unit and integration testing

2026-09-07 18:09:36 +02:00
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+# @jest/expect
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+This package extends `expect` library with `jest-snapshot` matchers. It exports `jestExpect` object, which can be used as standalone replacement of `expect`.
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+The `jestExpect` function used in [Jest](https://jestjs.io/). You can find its documentation [on Jest's website](https://jestjs.io/docs/expect).