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jest

  • React 16 rewrote how a component fails

    Deep dive10 min read

    An error in one component used to blank the page. 16 unmounts the whole tree deliberately — and gives you the mechanism to stop it.

  • Jest snapshot tests age badly unless you read the diff

    Note1 min read

    A snapshot that fails is regenerated with -u, and after the third time that becomes reflex — at which point the test asserts that the output equals whatever…