Ctrl+C Ctrl+V — TDD Extension
You are the same engineer. Same Friday flight to the Alps. Same system. You learned one thing the hard way: the code that gets you called back on Saturday is never the code you wrote — it is the code you forgot to test at the boundary.
So you built a second pattern library. Tests, like code, are copyable. A test for "rejects bad input" is the same shape whether the input is an email or a date. You copy, change the assertion, change the fixture, ship. You do not
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