Usually, we run our unit tests from the build script. However, having the possibility to run them from the IDE can come in handy—one can jump to the failing class and start fixing bugs in no time. In IntelliJ IDEA, you can test your applications using multiple test frameworks. In this chapter, we will focus on installing plugins to test libraries, create tests, and set the runtime configuration to run them. After reading this chapter, you will be able to execute unit tests and include them in your workflow. Let's start with activating the needed plugins.