JUnit

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JUnit: Basic

JUnit 4 with IntelliJ: A quick introduction _{-- by DrBFraser}

JUnit: Intermediate

Some intermediate JUnit techniques that may be useful:

It is possible for a JUnit test case to verify if the SUT throws the right exception.
JUnit Rules are a way to add additional behavior to a test. e.g. to make a test case use a temporary folder for storing files needed for (or generated by) the test.
It is possible to write methods thar are automatically run before/after a test method/class. These are useful to do pre/post cleanups for example.
Testing private methods is possible, although not always necessray