Mockito

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What Mockito is

Mockito is a free Java mocking framework for writing unit tests. It creates test doubles for concrete classes and interfaces, allowing developers to define behavior before code runs and inspect selected interactions afterward. Verification can check call order, require exact or minimum invocation counts, and use flexible argument matching. Spies support partial mocking: real methods execute while remaining available for stubbing and verification. The API also provides @InjectMocks for placing mock or spy fields into the object under test. Mockito is distributed by adding the mockito-core dependency through a build system, with setup guidance for Maven Central and Gradle and references to other build systems. Android use is available with Dexmaker; mockito-android tests require an Android P (API 28) or newer device or emulator. Mockito 5 requires Java 11. The project identifies an MIT license and lists Android, Linux, and self-hosted platforms. Help channels include Stack Overflow, a moderated mailing list, and GitHub issues. Commercial support and maintenance are available through Tidelift, and core engineers offer team training on test automation, behavior-driven development, and maintainable tests.

Who it suits

Mockito suits Java developers writing unit tests who need controllable substitutes for interfaces or concrete classes. It also fits teams using partial mocks, interaction verification, Maven or Gradle, or Android testing with Dexmaker.

What it does well

Mocks interfaces and concrete classes
Supports ordered and call-count verification
Spies run real methods while remaining stub-able
Provides @InjectMocks field injection
MIT-licensed and free to use
Offers Maven Central and Gradle setup guidance

What to know first

Mockito 5 requires Java 11
Android mockito-android tests require Android P or newer
There is no free trial period
Commercial support and maintenance are available through a Tidelift subscription

Limits

Mockito is listed as a free plan costing free, with no free trial. Mockito 5 requires Java 11, and mockito-android tests require Android P (API 28) or newer.

Plans

Plan	Billed and limits	Price
Mockito	Open-source Java mocking framework	Free

As site.mockito.org lists them, read 9 Oct 2026. The maker's own page has the final word.

Getting started

Open the Mockito website
Add the mockito-core dependency through Maven Central, Gradle, or another build system
Use Mockito with Java unit tests
For Android, add Dexmaker-based Mockito support
Ensure Mockito 5 uses Java 11
For mockito-android tests, use an Android P (API 28) or newer device or emulator

Verdict

Pick Mockito for Java unit tests that need stubbing, interaction checks, spies, or injected mocks. Its free MIT-licensed distribution and build-system setup suit development teams. Look elsewhere if your environment cannot use Java 11, or if Android testing cannot meet the Android P requirement.

Questions

Is Mockito free?

Yes. Mockito has a free plan listed as free and is MIT licensed.

Which language does Mockito support?

The supported language listed for Mockito is Java.

How do I install Mockito?

The recommended route is adding the mockito-core dependency through a build system. Setup instructions are provided for Maven Central and Gradle, with references to other build systems.

Can Mockito be used on Android?

Yes. The project describes Android use with Dexmaker. Mockito-android tests require an Android P (API 28) or newer device or emulator.

What verification does Mockito provide?

It supports ordered verification, exact or minimum call counts, and flexible argument matching.

Where can users get help?

Help is available through Stack Overflow, a moderated mailing list, and the GitHub issue tracker.

Facts from Mockito's own pages

Android: The site says Mockito can be used on Android with Dexmaker. · site.mockito.org, 9 Oct 2026
Android requirement: The v5.23.0 release notes state that mockito-android tests require an Android P (API 28) or newer device or emulator. · github.com, 9 Oct 2026
Argument matching: Mockito supports flexible argument matching for verification and stubbing. · github.com, 9 Oct 2026
Build tools: The site gives Maven Central and Gradle dependency setup instructions and refers users to other build systems. · site.mockito.org, 9 Oct 2026
Distribution: The recommended installation method is adding the mockito-core dependency through a build system. · site.mockito.org, 9 Oct 2026
Enterprise support: The repository says commercial support and maintenance are available through a Tidelift subscription. · github.com, 9 Oct 2026
Help: The project points users to Stack Overflow, a moderated mailing list, and its GitHub issue tracker for help. · github.com, 9 Oct 2026
Java requirement: The repository says Mockito 5 requires Java 11. · github.com, 9 Oct 2026
License: The repository publishes Mockito under the MIT License. · github.com, 9 Oct 2026
Mocking: It can mock concrete classes as well as interfaces. · github.com, 9 Oct 2026
Partial mocks: Its spy feature invokes real methods while allowing them to be verified and stubbed. · site.mockito.org, 9 Oct 2026
Purpose: Mockito is a mocking framework for writing unit tests in Java. · site.mockito.org, 9 Oct 2026
Security: The repository links to a security policy. · github.com, 9 Oct 2026
Spies and injection: Its API includes spies for partial mocking and @InjectMocks for injecting mock or spy fields. · site.mockito.org, 9 Oct 2026
Stubbing and verification: Mockito lets developers stub behavior before execution and verify selected interactions afterward. · github.com, 9 Oct 2026
Support: The project directs users to its mailing list for questions and documentation feedback, and GitHub for bugs and feature requests. · site.mockito.org, 9 Oct 2026
Training: Mockito core engineers offer team training on test automation with mock objects, behavior-driven development, and maintainable tests. · site.mockito.org, 9 Oct 2026
Use guidance: The project advises against mocking types you do not own, value objects, or everything indiscriminately. · site.mockito.org, 9 Oct 2026
Verification options: It supports ordered verification, exact or minimum call counts, and flexible argument matching. · github.com, 9 Oct 2026

Where Mockito stands on Freedom251

Unit Testing Frameworks#15 of 32