Example
Mockito offers a one-size-fits-all mehtod to create mocks of (non-final) classes and interfaces.
Dependency mock = Mockito.mock(Dependency.class);
This creates a mock instance of Dependency regardless of whether Dependency is a interface or class.
It is then possible to stub method calls to that mock using the Mockito.when(x).thenReturn(y) notation.
Mockito.when(mock.possiblyBuggyMethod()).thenReturn("someString");
So that calls to Dependency.possiblyBuggyMethod() simply return "someString".
There is another notation that is discouraged in most use cases as it is not typesafe.
Mockito.doReturn("someString").when(mock).possiblyBuggyMethod()
