CODEWITHSUNDEEP
javaunit-testingjunitmockito
adolzi
adolzi

Reputation: 691

How to call Mockito.given with private method

I found my method using ReflectionUtils

Method myMethod=ReflectionUtils.findMethod(myMockClass.getClass(), "myMethod", myArg.class)

Now I would like to drive this method to return a specified value. Normally, if myMethod would be public I would write for instance 

given(myMockClass.myMethod(myArg)).willReturn(5)

But is there any possibility to do it with private myMethod?
When I've called 

given(myMethod.invoke(myClass, myArg)).willReturn(5)

I've got java.lang.reflect.InvocationTargetException. I've read about PowerMock, but I would like to know whether it's possible with Mockito only

Edit:

public int A(args){
  int retValue;
  ... some code here, the most important part
  retValue=..
  if(some case)
      retValue= myMethod(args);
  return retValue;
}

Upvotes: 2

Views: 1036

Answers (3)

Jon Thoms
Jon Thoms

Reputation: 10817

Consider using Guava's @VisibleForTesting annotation here. Basically, just increase the visibility of the method to the minimal level necessary to test it.

For example, if your original method is:

private int calculateMyInt() {
  // do stuff
  return 0;
}

Your new method would be:

@VisibleForTesting // package-private to call from test class.
int calculateMyInt() {
  // do stuff
  return 0;
}

Upvotes: 2

Thomas Naskali
Thomas Naskali

Reputation: 581

Don't hesitate to change the method visibility to package protected, even if it's only for testing purpose (typically because you want to test the method or because you want to mock it). You should clearly indicate that fact though, a good way is by using an annotation (see this answer).

Upvotes: 1

Igor Konoplyanko
Igor Konoplyanko

Reputation: 9374

I would recommend you not to do it. If you need to mock behavior of private method then you have problems with your design. Your class is not testable.

As workaround will be to make your method package private, and test it within same package. This will work, but also not considered as good practice.

I would recommend to read this latest Uncle's bob article

Upvotes: 1

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