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Writing Beautiful Tests in Kotlin
Part 1 of 1
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Mockito-Kotlin is a small library that provides helper functions to work with Mockito in Kotlin. It is a great choice for Java devs already familiar with Mockito. Mockito is a widely used Java testing framework that helps create mock objects for unit testing. It allows developers to isolate code from dependencies, define behaviors, and verify method calls.
🤮 Legacy Java Mockito syntax. Don't do it.
val mock = mock(MyDependency::class.java)
😍 Now, don't these look better?
val mock: MyDependency = mock()
val mock = mock<MyDependency>
😍 Creating mocks inline can be quite handy!
val subject = MyClass(mock())
🤮 Mockito stubbing method when requires backticks since when is a reserved keyword in Kotlin.
`when`(mock.foo()).doReturn(null)
🙂 Mockito-Kotlin adds a whenever alias so you don't have to type or look at those ugly backticks.
whenever(mock.foo()).doReturn(null)
😍 Even better, Mockito-Kotlin adds a new stubbing DSL! It can be used when creating a new mock and on existing mocks.
val mock: MyDependency = mock {
on { foo() } doReturn { "default" }
on { bar() } doReturn { 1 }
}
@Test
fun test() {
mock.stub {
on { foo() } doReturn { "override" }
}
}
😍 It even supports stubbing of suspend functions (Kotlin Coroutines).
mock {
onBlocking { apiCall() } doReturn "Hello World"
}