Let's Code Dimdwarf #26: Avoid Rushing

The temptation to make the end-to-end test pass is high, but it's better to slow down and first write some unit tests for the feature. Otherwise the unit test coverage, which is the basis for enabling refactoring, would not be complete. Maybe a rule of thumb would be: "If end-to-end tests fail, but unit tests pass, you need more unit tests."

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