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wnoise comments on Coding Rationally - Test Driven Development - Less Wrong
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He didn't say "without copy and paste".
Come to think of it, "simplest" varies person to person. In one metric the "simplest that could work" would just be a huge switch statement mapping input for a given test to output for the same test...
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backticksfor inline code, andJust copying the expected value from the test into the body of the implementation will make the test go green, but it's completely un-DRY, so you'd have to rip it out and replace it with a non-c&p implementation during the necessary refactor phase anyways.
Wikipedia agrees with me on this, and they cite to "Test-Driven Development by Example" by Kent Beck, the original TDD guy.
So, TDD as I learned it discourages c&p from the test. However, Morendil, now you've got me interested in talking about the possible benefits of a c&p-permitted approach: for example, I can see how it might force the programmer to write more sophisticated tests. Though on the other hand, it might also force them to spend a lot more time on the tests but for only minor additional benefit.