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I propose this change where by the points to springmockk `3.0.1` which is the latest released and published version. I understand a commit was made to propare for the next version... I believe it's potentially misleading... Personally I've lost a few minutes today trying to figure out why my project couldn't download the dependency if I had followed the quickstart correctly.

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Support for Spring Boot integration tests written in Kotlin using MockK instead of Mockito.

Spring Boot provides @MockBean and @SpyBean annotations for integration tests, which create mock/spy beans using Mockito.

This project provides equivalent annotations MockkBean and SpykBean to do the exact same thing with MockK.


All the Mockito-specific classes of the spring-boot-test library, including the automated tests, have been cloned, translated to Kotlin, and adapted to MockK.

This library thus provides the same functionality as the standard Mockito-based Spring Boot mock beans.

For example (using JUnit 5, but you can of course also use JUnit 4):

class GreetingControllerTest {
    private lateinit var greetingService: GreetingService
    private lateinit var controller: GreetingController
    fun `should greet by delegating to the greeting service`() {
        every { greetingService.greet("John") } returns "Hi John"
        assertThat(controller.greet("John")).isEqualTo("Hi John")
        verify { greetingService.greet("John") }


Gradle (Kotlin DSL)

Add this to your dependencies:


If you want to make sure Mockito (and the standard MockBean and SpyBean annotations) is not used, you can also exclude the mockito dependency:

testImplementation("org.springframework.boot:spring-boot-starter-test") {
    exclude(module = "mockito-core")


Add this to your dependencies:


Differences with Mockito

  • the MockK defaults are used, which means that mocks created by the annotations are strict (i.e. not relaxed) by default. But you can configure MockK to use different defaults globally, or you can use @MockkBean(relaxed = true) or @MockkBean(relaxUnitFun = true).
  • the created mocks can't be serializable as they can be with Mockito (AFAIK, MockK doesn't support that feature)


  • the issue 5837, which has been fixed for Mockito spies using Mockito-specific features, also exists with MockK, and hasn't been fixed yet. If you have a good idea, please tell!
  • this is not an official Spring Boot project, so it might not work out of the box for newest versions if backwards incompatible changes are introduced in Spring Boot. Please file issues if you find problems.
  • annotations are looked up on fields, and not on properties (for now). This doesn't matter much until you use a custom qualifier annotation. In that case, make sure that it targets fields and not properties, or use @field:YourQualifier to apply it on your beans.

Versions compatibility

  • Version 3.x of SpringMockK: compatible with Spring Boot 2.4.x
  • Version 2.x of SpringMockK: compatible with Spring Boot 2.2.x and 2.3.x
  • Version 1.x of SpringMockK: compatible with Spring Boot 2.1.x

How to build

  ./gradlew build