Using Mockito, how do I intercept a callback object on a void method?
-
01-10-2019 - |
Question
I'm using mockito to test a legacy JAAS/LDAP login module.
The javax.security.auth.callback.CallbackHandler
interface defines the function:
void handle(javax.security.auth.callback.Callback[] callbacks)
I'm expecting callbacks
to contain a NameCallback
, which is the object that needs to be manipulated to pass the test.
Is there a way to mock this effectively, or would I be better off with a stubbed implementation of CallbackHandler
?
Solution
For functions returning void
, use doAnswer()
doAnswer(...).when(mockedObject).handle(any(Callback[].class));
And an Answer
that performs the interception must go in as the parameter to doAnswer
, e.g. as an anonymous class:
new Answer() {
public Object answer(InvocationOnMock invocation) {
Object[] args = invocation.getArguments();
Mock mock = invocation.getMock();
return null;
}}
In this case args
will be the array Callback[]
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