* Think about what you want to do.
* Think about how to test it.
* Write a small test. Think about the desired API.
* Write just enough code to fail the test.
* Run and watch the test fail. (The test-runner, if you're using something like JUnit, shows the "Red Bar"). Now you know that your test is going to be executed.
* Write just enough code to pass the test (and pass all your previous tests).
* Run and watch all of the tests pass. (The test-runner, if you're using JUnit, etc., shows the "Green Bar"). If it doesn't pass, you did something wrong, fix it now since it's got to be something you just wrote.
* If you have any duplicate logic, or inexpressive code, refactor to remove duplication and increase expressiveness -- this includes reducing coupling and increasing cohesion.
* Run the tests again, you should still have the Green Bar. If you get the Red Bar, then you made a mistake in your refactoring. Fix it now and re-run.
* Repeat the steps above until you can't find any more tests that drive writing new code.
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