def test_parser_parse(patch, parser):
patch.many(Parser, ['lark', 'transformer'])
result = parser.parse('source')
Parser.lark().parse.assert_called_with('source\n')
Parser.transformer().transform.assert_called_with(Parser.lark().parse())
assert result == Parser.transformer().transform()
def test_parser_transformer(patch):
patch.init(Transformer)
result = Parser.transformer()
assert isinstance(result, Transformer)