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How to write unit tests. How do you learn how to write good unit tests. Unit tests should test both sides of a given boundary. Even if you re a brilliant coder with decades of experience your existing knowledge and habits won t automatically lead you to write good unit tests because it s a different kind of coding and most people start with unhelpful false assumptions about. Good unit tests is essentially the specification in runnable form. It s far from obvious.
But if you work in a team or if you re planning to launch a much larger project then it s good to build the habit of unit testing your code. Not everyone has a need to write unit tests so these principles may not apply to smaller personal projects. First it initializes a small piece of an application it wants to test also known as the system under test or sut then it applies some stimulus to the system under test usually by calling a method on it and finally it observes the resulting behavior. In roy osherove s the art of unit. Break if the code tested change away from the specification.
Write your unit tests to check if code will do what is expected then write the code then test it. The go test tool has built in code coverage for statements. If you are building some tests for date and time utilities try testing one second before midnight and one second after. Writing the tests first encourages you to write just enough code to make the program do what it needs to without inadvertently including unnecessary or bad code. Most of the time a testing framework like junit or testng is used.
What s the difference between a good unit test and a bad one. The difference between unit and integration tests is that unit tests usually isolate dependencies that communicate with network disk etc. The most common approach to unit testing requires drivers and stubs to be written. A typical unit test contains 3 phases. Unit tests normally test only one thing such as a function.
Describe the behavior of the code corresponding to use cases cover technical corner cases what happens if null is passed if a test is not present for a corner case the behavior is undefined. To try it with out example above type in. The driver simulates a calling unit and the stub simulates the called unit. 1 3 more on go test.
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