android - 如何使用 Mockito.mockStatic 在 kotlin android 中模拟静态方法

Question

如何使用 Mockito.mockStatic 在 kotlin android 中模拟静态方法？
这是我的代码:

    class MyUtilClassTest {
       @Test
       fun testIsEnabled() {
          Mockito.mockStatic(MyUtilClass::class.java, Mockito.CALLS_REAL_METHODS)
                .use { mocked ->
                    mocked.`when`<Boolean> { MyUtilClass.isEnabled() }.thenReturn(true)
                    assertTrue(MyUtilClass.isEnabled())
                }
       }
    }
    
    object MyUtilClass {
       fun isEnabled(): Boolean = false
    }

我得到了这个异常(exception):

org.mockito.exceptions.misusing.MissingMethodInvocationException:when() requires an argument which has to be 'a method call on a mock'.For example:when(mock.getArticles()).thenReturn(articles);

Also, this error might show up because:

1. you stub either of: final/private/equals()/hashCode() methods.Those methods cannot be stubbed/verified.Mocking methods declared on non-public parent classes is not supported.
2. inside when() you don't call method on mock but on some other object.

Answer 1

如果你注释你的函数 isEnabled与 @JvmStatic ，你不会得到任何错误。如@Neige指出，Kotlin 中的静态函数在 bytecode 中实际上不是静态的默认。因此，我们需要用 @JvmStatic 标记我们的函数。为了生成额外的静态getter/setter方法。

object MyUtilClass {
   @JvmStatic
   fun isEnabled(): Boolean = false
}