Mastering Kotlin

Mockito-Kotlin

Mockito-Kotlin is an interesting example of a testing library that makes use of Kotlin features to provide a custom testing DSL that makes mocking and testing feel very fluent and readable.

In the following code snippet, you can see an example of using Mockito-Kotlin to mock the behavior of the GreetingProvider class:

@Testfun `test with mockito-kotlin`() {    val mockGreeter = mock<SimpleGreeter> {        on { getGreeting() } doReturn "Hey there!"        on { getMessage() } doReturn  "You're great!"    }}

Notice that this test code is making heavy use of lambdas and higher-order functions.

The mock() function is passed a lambda within which that mocked object can have its behavior configured. This configuration becomes very human readable when ...