MockK
mockk.io
Spec sheet
- Purpose
- MockK is a mocking library for Kotlin.Read 11 Oct 2026 · mockk.io
- Support
- The project directs users to Stack Overflow or Gitter for questions and GitHub for bug reports.Read 11 Oct 2026 · mockk.io
- License
- The linked public GitHub repository identifies its license as Apache-2.0.Read 4 Oct 2026 · github.com
- BDD
- Optional BDD-style aliases include given, then, coGiven, and coThen.Read 4 Oct 2026 · mockk.io
- BDD aliases
- MockK provides optional BDD style aliases such as given and then.Read 11 Oct 2026 · mockk.io
- Coroutines
- MockK supports stubbing and verifying suspend functions with coroutine-specific APIs, with the kotlinx-coroutines-core dependency.Read 11 Oct 2026 · mockk.io
- Distribution
- The setup guide lists JVM, Android unit-test and Android instrumented-test dependency artifacts.Read 11 Oct 2026 · mockk.io
- Framework integrations
- The site points to SpringMockK for Spring support and quarkus-mockk for mocking Quarkus beans.Read 11 Oct 2026 · mockk.io
- Framework support
- The site links to SpringMockK and Quarkus-MockK support.Read 4 Oct 2026 · mockk.io
- JDK caveats
- The documentation notes dynamic Java agent warnings on JDK 21+ and says spies or mockkStatic may not work on JDK 16+.Read 11 Oct 2026 · mockk.io
- Known issue
- The site notes that spies and mockkStatic may fail on JDK 16 and later with access exceptions.Read 4 Oct 2026 · mockk.io
- Known limitation
- Inline functions cannot be mocked, according to the known issues section.Read 11 Oct 2026 · mockk.io
- Kotlin compatibility
- The site says MockK supports Kotlin 1.4 and higher from version 1.13.0.Read 4 Oct 2026 · mockk.io
- Kotlin support
- The site says MockK supports Kotlin 1.4 and higher from MockK version 1.13.0.Read 11 Oct 2026 · mockk.io
- Mock behavior
- Mocks are strict by default and require behavior to be provided.Read 4 Oct 2026 · mockk.io
- Mocking features
- The feature guide covers spies, relaxed and partial mocks, object, class, enum and constructor mocks, argument matching, and call verification.Read 11 Oct 2026 · mockk.io
- Security-related feature
- Restricted Mocking can prevent mocking classes considered problematic for reliable tests, and the documentation lists several Java system and collection classes restricted by default.Read 4 Oct 2026 · mockk.io
- Setup
- The documentation shows adding MockK as a test dependency with Gradle or Maven.Read 11 Oct 2026 · mockk.io
- Strict mocks
- Mocks are strict by default, so users need to provide behavior for them.Read 11 Oct 2026 · mockk.io
- Suspending spy caveat
- The site warns that using a spy with a suspending function can produce unexpected test results.Read 11 Oct 2026 · mockk.io
- Test integrations
- The documentation describes JUnit 4 and JUnit 5 support, including a JUnit 5 extension for initializing mocks.Read 11 Oct 2026 · mockk.io
Where Specifiction places it
- Unit Testing Frameworks#28 of 327.3
