testing-concept-tdd-steps

• Write a failing test
• Write the simplest production code possible that will make it pass
• Refactor production code to make the implementation clean
• Do we need more tests? If 'yes' then start back at 1, if 'no' then we're done

"Write the simplest production code possible" is surprising the first time you see it. It literally means hard-coding an answer in a method. If hard-coding the answer means the code isn't flexible enough to accommodate your cases, that means you need to do step 4 and add more tests.

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