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Tech riderRev. 21 Sept 2026

MockK

Ch 126.4of 32 Unit Testing Frameworks
  1. 1Runs onAndroid
  2. 2CostsNot stated by the maker
  3. 3Supported languagesKotlin
  4. 4Built-in mocksYes
  5. 5Parallel executionYes
4 lines stated Written from the maker's own pages: mockk.io
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The MockK homepage

Overview

MockK is ranked #12 of 32 in unit testing frameworks on Specifiction. It runs on Android.

Compared on unit testing frameworks

Supported languages
Kotlinmockk.io
Built-in mocks
Yesmockk.io
Parallel execution
Yesmockk.io

Facts

Purpose
MockK describes itself as a mocking library for Kotlin.mockk.io · 4 Oct 2026
Setup
The site provides Gradle and Maven test dependency examples for MockK.mockk.io · 4 Oct 2026
Mock behavior
Mocks are strict by default and require behavior to be provided.mockk.io · 4 Oct 2026
BDD
Optional BDD-style aliases include given, then, coGiven, and coThen.mockk.io · 4 Oct 2026
Framework support
The site links to SpringMockK and Quarkus-MockK support.mockk.io · 4 Oct 2026
Kotlin compatibility
The site says MockK supports Kotlin 1.4 and higher from version 1.13.0.mockk.io · 4 Oct 2026
Test integrations
The documentation describes JUnit 4 rule support and a JUnit 5 extension.mockk.io · 4 Oct 2026
Coroutines
MockK supports stubbing and verifying suspend functions with coroutine-specific APIs such as coEvery and coVerify.mockk.io · 4 Oct 2026
Mocking features
Documented features include spies, relaxed mocks, partial mocking, object mocks, class mocks, and constructor mocks.mockk.io · 4 Oct 2026
Known limitation
Inline functions cannot be mocked, according to the site's known issues section.mockk.io · 4 Oct 2026
Known issue
The site notes that spies and mockkStatic may fail on JDK 16 and later with access exceptions.mockk.io · 4 Oct 2026
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.mockk.io · 4 Oct 2026
Support
The site directs users to Stack Overflow or Gitter for questions and to GitHub for bug reports.mockk.io · 4 Oct 2026
License
The linked public GitHub repository identifies its license as Apache-2.0.github.com · 4 Oct 2026

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Where it ranks on Specifiction

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Sources