The libraries for JUnit and TestNG are shipped with IntelliJ IDEA, but are not included in the
classpath of your project or module by default. Consequently, when a test class is created,
the references to the TestCase class or test annotations are not resolved.
To add the necessary library to the classpath, you can use the general procedure of configuring libraries.
The corresponding libraries are located in the following directories:
- JUnit libraries (junit.jar and junit-4.8.jar): <IntelliJ IDEA directory>\lib.
- TestNG library (testng-jdk15.jar): <IntelliJ IDEA directory>\plugins\testng\lib.
IntelliJ IDEA can add the necessary library to the classpath automatically.
The corresponding features are available when creating a test for a class or when
writing the code for a test.