Configuring IntelliJ IDEA for unit testing with JUnit

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If you already have a test class, but missing the JUnit library dependency, please refer to
Configuring Libraries for Unit Testing documentation section. Pressing Alt+Enter on the red code should give you an intention action to add the missing jar.

However, IDEA offers much more. If you don’t have a test class yet and want to create one for any of the source classes, see instructions below.

You can use the Create Test intention action by pressing Alt+Enter while standing on the name of your class inside the editor or by using Ctrl+Shift+T keyboard shortcut.

A dialog appears where you select what testing framework to use and press Fix button for the first time to add the required library jars to the module dependencies. You can also select methods to create the test stubs for.

Create Test Intention

Create Test Dialog

You can find more details in the Testing help section of the on-line documentation.

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