A unit test attempts to verify a mojo as an isolated unit, by mocking out the rest of the Maven environment. A mojo unit test does not attempt to run your plugin in the context of a real Maven build. Unit tests are designed to be fast.

This testing library is NOT designed for integration or functional testing.

TestCase from JUnit

You could use the JUnit framework to test your plugin in the same way you'd write any other JUnit test cases, i.e. by writing a test class which extends TestCase.

TestCase from Plexus

Mojos are written to take specific advantage of the Plexus container. If you need Plexus container services, you could write your class which extends PlexusTestCase, instead of TestCase.

TestCase from Testing Harness

If you need to inject Maven objects into your mojo, you could use the maven-plugin-testing-harness. The maven-plugin-testing-harness is explicitly intended to test the org.apache.maven.reporting.AbstractMavenReport#execute() implementation.