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MockK

Free#31 of 32 in Unit Testing Frameworks

MockK: A focused Kotlin mocking toolkit with strong coroutine and verification support. Ranked #31 of 32 in Unit Testing Frameworks by our editors (6.0/10); pricing: Open source; best for kotlin teams needing advanced mocking.

6.0/10Editor score
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MockK6.0 Visit MockK

At a glance

  • Editor score
    6.0 / 10
  • Pricing
    Open source
  • Best for
    Kotlin teams needing advanced mocking
  • Paid from
    Free
  • Supported languages
    Kotlin
  • Facts checked
    21 Sep 2026
MockK screenshot

  • Where it wins

    • Mocks classes, objects, constructors, statics, extensions, and coroutines
    • Supports JUnit 4, JUnit 5, Gradle, Maven, Spring, and Quarkus
    • Provides verification, ordering, timeouts, injection, spies, and argument capture

  • Where it doesn't

    • Focused on mocking rather than standalone test orchestration
    • Supported language is Kotlin
    • Broader test workflows still depend on its test-framework integrations

Our verdict on MockK

MockK is an open-source Kotlin mocking library for JVM and Android tests. It is designed for Kotlin teams that need to create mocks, stub behavior, verify calls, spy on real objects, and test coroutine-based code. Its Kotlin-focused DSL covers class, object, constructor, static, top-level, and extension-function mocking, while annotations support mock initialization and dependency injection. It supports regular unit tests and Android instrumented tests, making it relevant to Android development as well as JVM-based Kotlin projects.

Mocking depth is MockK’s main strength. Teams can combine argument matchers and argument capturing with call verification, ordering, confirmation, and timeouts. Coroutine mocking and verification are included, alongside restricted mocking configuration and partial mocking through spies. These capabilities make MockK a strong fit when tests need detailed control over collaborators, object behavior, constructors, or asynchronous Kotlin code. JUnit 4 and JUnit 5 integrations help connect that mocking layer to established test suites, while Gradle and Maven integrations fit common Kotlin build workflows.

The product’s scope is deliberately narrower than a complete unit-test orchestration system. MockK supplies extensive mocking and verification, but its role is not to replace a standalone test runner. Kotlin teams should choose it when advanced mocking is the priority, particularly for coroutine-heavy or Android-oriented tests. Teams seeking a broader testing system beyond mocking should pair it with appropriate test-framework tooling rather than treat MockK as the entire test workflow.

Your product? Our editors can test MockK in depth and publish a review, labelled as paid · from $149/mo →

MockK pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.
See plans on mockk.io

MockK fact sheet

Free planNot verified
Paid fromFree
Supported languagesKotlin
Built-in mocksYes
Parameterized casesNot verified
Parallel executionYes
Snapshot testingNot verified
Property-based checksNot verified
DeploymentMobile
PlatformsAndroid
SupportCommunity, Docs
Built forSolo, Small business, Mid-market, Enterprise (editorial estimate)
Integrations6 integrations: JUnit 4, JUnit 5, Android, Spring, Quarkus, Kotlin coroutines
PricingOpen source
Websitemockk.io
Facts checked21 Sep 2026

MockK integrations

MockK lists 6 integrations on its own site.

  • JUnit 4
  • JUnit 5
  • Android
  • Spring
  • Quarkus
  • Kotlin coroutines

Alternatives to MockK

See all MockK alternatives →

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Featured on iTechGuides

Featured on iTechGuides — MockK 6.0/10

MockK is listed in our Unit Testing Frameworks directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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