Kotlin Programming Cookbook

How to do it…

We usually use Mockito to mock Android classes, but let's test a simple class using Mockito:

1. Here's a small test that tests a functionUnderTest function of the Utility class:

@Testfun test_functionUnderTest(){    val classUnderTest= mock(Utility::class.java)    classUnderTest.functionUnderTest()    verify(classUnderTest).functionUnderTest()}

2. In the preceding class, we are calling the functionUnderTest method and then verifying whether the method has been called or not. (Yeah!, not a very good use case of a test, but let's try to run this test) When you run it, you'll see an error like this:

org.mockito.exceptions.base.MockitoException: Cannot mock/spy class com.ankoexamples.app.UtilityMockito cannot mock/spy because : - final class ...