How to write a matcher that is not equal to something

Question

I am trying to create a mock for a call. Say I have this method I am trying to stub out:

class ClassA {   public String getString(String a) {     return a + "hey";   } } 

What I am trying to mock out is: 1st instance is

when(classA.getString(eq("a")).thenReturn(...);` 

in the same test case

when(classA.getString([anything that is not a])).thenReturn(somethingelse); 

The 2nd case is my question: How do I match anyString() other than "a"?

Answer 1

With Mockito framework, you can use AdditionalMatchers

ClassA classA = Mockito.mock(ClassA.class); Mockito.when(classA.getString(Matchers.eq("a"))).thenReturn("something");  Mockito.when(classA.getString(AdditionalMatchers.not(Matchers.eq("a")))).thenReturn("something else"); 

Hope it helps.

Answer 2

Use argThat with Hamcrest:

when(classA.getString(argThat(CoreMatchers.not(CoreMatchers.equalTo("a")))... 

You might also be able to do this via ordering. If you put one when(anyString) and when(eq("a")) in the correct order, Mockito should test them in order and do the "a" logic when appropriate and then "anyString" logic otherwise.