def test_preprocessor_service_no_service(patch, magic, tree):
patch.object(Preprocessor, 'service_arguments')
tree.node.return_value = None
Preprocessor.service(tree)
assert Preprocessor.service_arguments.call_count == 0
def test_preprocessor_service(patch, magic, tree):
patch.object(Preprocessor, 'service_arguments')
Preprocessor.service(tree)
tree.node.assert_called_with('service_block.service')
Preprocessor.service_arguments.assert_called_with(tree, tree.node())