Probably, most of you already know this, but it is good to keep it in mind when you want to dynamically change the values returned by a mock you have.
doAnswer(invocation -> { @SuppressWarnings("unchecked") RestCallback restCallback = (RestCallback) invocation.getArguments()[0]; restCallback.onSuccess(null); return null; }).when(mApi).updateNode(Matchers.anyObject(), any(NodeEntity.class), eq(NODE_ID))
The most important things here are:
– doAnswer – method that accepts the invocation from which you can get the actual arguments and mock the return value
– when – method that is used on the mocked instance and does the magic to return whatever you want
Another way to mock the returned value is to use:
verify(mApi).getSchedule(NODE_ID);
which actually verifies that the mApi.getSchedule was called with the NODE_ID constant.