如何解决 thenReturn() 可能缺少 junit 中的异常

Question

Can someone please help what to do to resolve below mentioned exception When stubbing below mentioned line

Mockito.doNothing().when(customerRepository.save(customerProduct)) 

Suggest me correct execution here

E.g. thenReturn() may be missing.

Examples of correct stubbing:

    when(mock.isOk()).thenReturn(true);
    when(mock.isOk()).thenThrow(exception);
    doThrow(exception).when(mock).someVoidMethod();

Hints:

 1. missing thenReturn()
 2. you are trying to stub a final method, which is not supported
 3. you are stubbing the behaviour of another mock inside before 'thenReturn' instruction is completed

Answer 1

The mockito docs tell doNothing() method should be used like this:

doNothing().when(mock).method()

So in your case you may want to try this:

Mockito.doNothing().when(customerRepository)
    .save(customerProduct)