Mockito

Mockito is an open source testing framework for Java released under the MIT License. The framework allows the creation of test double objects (mock objects) in automated unit tests for the purpose of test-driven development (TDD) or behavior-driven development (BDD).

The framework's name and logo are a play on mojitos, a type of drink.

Features
Mockito allows developers to verify the behavior of the system under test (SUT) without establishing expectations beforehand. One of the criticisms of mock objects is that there is a tight coupling of the test code to the system under test. Mockito attempts to eliminate the expect-run-verify pattern by removing the specification of expectations. Mockito also provides some annotations for reducing boilerplate code.

Origins
Mockito began by expanding on the syntax and functionality of EasyMock.

Example
Consider this decoupled Hello world program; we may unit test some of its parts, using mock objects for other parts.

The result of HelloApplication launching will be the following:

application: hello world

Unit test for HelloActable component may look like this:

It uses mock objects for the Greeter and Appendable interfaces, and implicitly assumes the next use case:

unitTest : hi world

Integration test code for testing HelloActable wired together with Greeter may look like the following:

It uses mock objects only in place of Appendable interfaces, uses the real implementations for other (HelloActable and Greeter) interfaces, and implicitly assumes the next use case:

integrationTest says welcome universe

As can be seen from the import statements of HelloActionUnitTest and HelloActionIntegrationTest classes, it is necessary to put some Mockito jars and JUnit jars in your class path to be able to compile and run the test classes.