The Half-Life Layer — Or, "It Passed in March" Is Not the Same as "It Passes Now"

<p>Somewhere in your repository there is a test that passed in March. It passed against a schema that has since gained two columns, a dependency that has since changed its default timeout, and a traffic profile that has since shifted from mostly reads to mostly writes. The test still passes. Nobody has run it against the current system in a way that would notice the difference.</p> <p>That is not

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