Menu
Mockk allows mocking static functions, but how does one mock a Kotlin top level function?
For example, if I have a Kotlin file called HelloWorld.kt, how do I mock the sayHello() function?
HelloWorld.kt
fun sayHello() = "Hello Kotlin!" 
336
Top-level functions are functions inside a Kotlin package that are defined outside of any class, object, or interface. This means that they are functions you call directly, without the need to create any object or call any class.
In Android, there are a lot of frameworks used for mocking in unit testing, such as PowerMock, Mockito, EasyMock, etc. MockK is definitely a better alternative to other mocking frameworks for Kotlin, the official development language for Android. Its main philosophy is first-class support for Kotlin features.
Inside the verification block (between the opening curly bracket { and closing curly bracket } ), you write the method you want to verify. { navigator. navigateTo("Park") } tells MockK to check if the navigateTo method on the navigator object was called with the argument "Park" .
A relaxed mock is the mock that returns some simple value for all functions. This allows you to skip specifying behavior for each case, while still stubbing things you need. For reference types, chained mocks are returned. Note: relaxed mocking is working badly with generic return types.
There is way to mockk a top level function:
mockkStatic("pkg.FileKt") every { fun() } returns 5 You just need to know which file this function goes. Check in JAR or stack trace.
194
The following syntax has worked to me.
mockkStatic(::sayHello.javaMethod!!.declaringClass.kotlin) I'm surprised there is nothing on the jvm-stdlib yet for this.
Edit: This overload has now been introduced officially: https://github.com/mockk/mockk/pull/518
mockkStatic(::sayHello) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
