JUnit is a simple framework to write repeatable tests. It is an instance of the xUnit architecture for unit testing frameworks.

JUnit - A programmer-oriented testing framework for Java

Mockito is a mocking framework that tastes really good. It lets you write beautiful tests with a clean & simple API. Mockito doesn’t give you hangover because the tests are very readable and they produce clean verification errors.

Mockito - Most popular Mocking framework for unit tests written in Java

Truth makes your test assertions and failure messages more readable. Similar to AssertJ, it natively supports many JDK and Guava types, and it is extensible to others.

Truth - Fluent assertions for Java

Robolectric is the industry-standard unit testing framework for Android. With Robolectric, your tests run in a simulated Android environment inside a JVM, without the overhead and flakiness of an emulator. Robolectric tests routinely run 10x faster than those on cold-started emulators. Robolectric supports running unit tests for 16 different versions of Android, ranging from Jelly Bean (API level 16) to SV2 (API level 32).
 
Unlike traditional emulator-based Android tests, Robolectric tests run inside a sandbox which allows the Android environment to be precisely configured to the desired conditions for each test, isolates each test from its neighbors, and extends the Android framework with test APIs which provide minute control over the Android framework’s behavior and visibility of state for assertions.

Robolectric is the industry-standard unit testing framework for Android. With Robolectric, your tests run in a simulated Android environment inside a JVM, without the overhead and flakiness of an emulator. Robolectric tests routinely run 10x faster than those on cold-started emulators. Robolectric supports running unit tests for 16 different versions of Android, ranging from Jelly Bean (API level 16) to SV2 (API level 32).

Robolectric - Android Unit Testing Framework

A java GUI-Less browser, which allows high-level manipulation of web pages, such as filling forms and clicking links; just getPage(url), find a hyperlink, click() and you have all the HTML, JavaScript, and Ajax are automatically processed.

HtmlUnit -  Java GUI-Less browser, supporting JavaScript, to run against web pages 

Arquillian is an innovative and highly extensible testing platform for the JVM that enables developers to easily create automated integration, functional and acceptance tests for Java middleware. Arquillian handles all the plumbing of container management, deployment and framework initialization so you can focus on the task at hand, writing your tests. Real tests.
 
Arquillian provides a component model for integration tests, which includes dependency injection and container life cycle management. Instead of managing a runtime in your test, Arquillian brings your test to the runtime.

Arquillian is an innovative and highly extensible testing platform for the JVM that enables developers to easily create automated integration, functional and acceptance tests for Java middleware. Arquillian handles all the plumbing of container management, deployment and framework initialization so you can focus on the task at hand, writing your tests. Real tests. 

Arquillian - Testing Platform for JVM

Randoop generates unit tests using feedback-directed random test generation. This technique pseudo-randomly, but smartly, generates sequences of method/constructor invocations for the classes under test. Randoop executes the sequences it creates, using the results of the execution to create assertions that capture the behavior of your program. Randoop creates tests from the code sequences and assertions. 
 
 Randoop can be used for two purposes: to find bugs in your program, and to create regression tests to warn you if you change your program's behavior in the future.

Randoop generates unit tests using feedback-directed random test generation. This technique pseudo-randomly, but smartly, generates sequences of method/constructor invocations for the classes under test. Randoop executes the sequences it creates, using the results of the execution to create assertions that capture the behavior of your program. Randoop creates tests from the code sequences and assertions. 

Randoop - Automatic test generation for Java

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JUnit - A programmer-oriented testing framework for Java

Mockito - Most popular Mocking framework for unit tests written in Java

Truth - Fluent assertions for Java

Robolectric - Android Unit Testing Framework

HtmlUnit - Java GUI-Less browser, supporting JavaScript, to run against web pages

Arquillian - Testing Platform for JVM

Randoop - Automatic test generation for Java

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JUnit - A programmer-oriented testing framework for Java

Mockito - Most popular Mocking framework for unit tests written in Java

Truth - Fluent assertions for Java

Robolectric - Android Unit Testing Framework

HtmlUnit - Java GUI-Less browser, supporting JavaScript, to run against web pages

Arquillian - Testing Platform for JVM

Randoop - Automatic test generation for Java

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