Guava is a suite of core and expanded libraries that include

Code Analyzer for Java :: Front-end (Java Parser)

Implementation of the SLF4J API for Logback, a reliable, generic, fast and flexible logging framework.

JUnit Jupiter is the API for writing tests using JUnit 5.

'Flexible' or 'fluent' assertions for testing

Mockito mock objects library core API and implementation

Code Analyzer for Java :: Checks Test tool kit