Guava is a suite of core and expanded libraries that include

Square’s meticulous HTTP client for Java and Kotlin.

Square’s meticulous HTTP client for Java and Kotlin.

A type-safe HTTP client for Android and Java.

A Retrofit Converter which uses Moshi for serialization.

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

Rich and fluent assertions for testing in Java

Mockito mock objects library core API and implementation

Binding/provider for SLF4J, which outputs all events to System.err. Only messages of level INFO and higher are printed.