testModel.setFooRequired(100).setFooUnion(fooUnion).setFooOptional(null, SetMode.REMOVE_IF_NULL);
testModel.getFooRecordTemplate().setBar(9001l);
// GetMode should be irrelevant
testModel.getFooRecordTemplate(GetMode.DEFAULT).setBaz(null, SetMode.REMOVE_IF_NULL);
PatchTree ptExpect = PatchCreator.diff(new DataMap(),
new PatchTreeTestModel().setFooRequired(100).setFooUnion(fooUnion).data());
// Augment the patch request with the removes in the same order so we get the same patch request.
ptExpect.addOperation(PatchTreeTestModel.fields().fooOptional(), new RemoveFieldOp());
ptExpect.addOperation(PatchTreeTestModel.fields().fooRecordTemplate().bar(), new SetFieldOp(9001l));
ptExpect.addOperation(PatchTreeTestModel.fields().fooRecordTemplate().baz(), new RemoveFieldOp());
Assert.assertEquals(pc.generatePatchTree().getDataMap(),
ptExpect.getDataMap());
}