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import pytest |
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2
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3
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4
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@pytest.fixture |
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5
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def test_transformers(): |
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6
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from so_magic.utils import Transformer |
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7
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def func1(a, b=2): |
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return a * b + 1 |
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9
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def func2(a, b, *, c=1): |
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10
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return a * b + c |
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def func3(a, b, **kwargs): |
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return a * b + kwargs.get('c', 1) |
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return { |
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'lambda': { |
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'transformer': Transformer(lambda x: x + 1), |
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'expected_nb_positional_args': 1, |
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'kwarg_allowed': lambda key_to_check: False, |
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}, |
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'func1': { |
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'transformer': Transformer(func1), |
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'expected_nb_positional_args': 1, |
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'kwarg_allowed': lambda key_to_check: key_to_check in set(['b']), |
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}, |
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'func2': { |
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'transformer': Transformer(func2), |
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'expected_nb_positional_args': 2, |
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'kwarg_allowed': lambda key_to_check: key_to_check in set(['c']), |
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}, |
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'func3': { |
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'transformer': Transformer(func3), |
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'expected_nb_positional_args': 2, |
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'kwarg_allowed': lambda key_to_check: True, |
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}, |
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} |
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36
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37
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@pytest.mark.parametrize('transformer, args_list, kwargs_dict, expected_result', [ |
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('lambda', [1], {}, 2), |
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('lambda', [0], {}, 1), |
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('func1', [10], {}, 21), |
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('func1', [10], {'b': 3}, 31), |
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# ('func2', [10, 2], {}, 21), # this should work commented out |
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# ('func2', [10, 2], {'c': 3}, 23), # this should work commented out |
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# ('func3', [10, 2], {}, 21), # this should work commented out! |
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# ('func3', [10, 2], {'a': 100}, 21), # this should work commented out! |
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# ('func3', [10, 2], {'c': 1}, 21), # this should work commented out! |
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# ('func3', [10, 2], {'c': 3}, 23), # this should work commented out! |
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48
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]) |
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49
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def test_transform_method(transformer, args_list, kwargs_dict, expected_result, test_transformers): |
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assert expected_result == test_transformers[transformer]['transformer'].transform(*args_list, **kwargs_dict) |
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51
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52
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53
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@pytest.fixture(params=[ |
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54
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['instance', ValueError, lambda x: f"Expected a callable as argument; instead got '{type(x)}'"], |
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['function', ValueError, lambda x: f"Expected a callable that receives at least one positional argument; instead got a callable that receives '{x.__code__.co_argcount}' arguments."], |
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56
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]) |
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57
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def false_arguments(request): |
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a = object() |
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def f(): pass |
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callables = {'instance': a, 'function': f} |
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first_argument = callables[request.param[0]] |
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return {'args': [first_argument], |
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'exception': request.param[1], |
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'exception_text': request.param[2](first_argument), |
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} |
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67
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68
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def test_false_arguments(false_arguments): |
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from so_magic.utils import Transformer |
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with pytest.raises(false_arguments['exception'], match=false_arguments['exception_text']): |
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_ = Transformer(*false_arguments['args']) |
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72
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73
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74
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@pytest.fixture |
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def exception_message(test_transformers): |
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def more_args_error(args_list, kwargs_dict, data): |
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return rf"transform\(\) takes {data['expected_nb_positional_args'] + 1} positional arguments but {len(args_list) + 1} were given" |
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79
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def more_kwargs_error(args_list, kwargs_dict, data): |
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unexpected_keywords = set([k for k in kwargs_dict.keys() if not data['kwarg_allowed'](k)]) |
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return rf"func1\(\) got an unexpected keyword argument '[{''.join(unexpected_keywords)}]'" |
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82
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83
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e = { |
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'more_args_error': more_args_error, |
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'more_kwargs_error': more_kwargs_error, |
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} |
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87
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def get_exception_message(transformer_id, args_list, kwargs_dict, error_type: str): |
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return e[error_type](args_list, kwargs_dict, test_transformers[transformer_id]) |
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return get_exception_message |
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90
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91
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92
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@pytest.mark.parametrize('transformer_id, args_list, kwargs_dict, error_type', [ |
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('lambda', [0, 2], {}, 'more_args_error'), |
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('func1', [2], {'b': 2, 'f': 8}, 'more_kwargs_error'), |
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95
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('func1', [10, 20], {'b': 2}, 'more_args_error'), |
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96
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('func1', [10, 3], {}, 'more_args_error'), |
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]) |
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98
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def test_wrong_transform_arguments(transformer_id, args_list, kwargs_dict, error_type, test_transformers, exception_message): |
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99
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transformer = test_transformers[transformer_id]['transformer'] |
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100
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with pytest.raises(TypeError, match=exception_message(transformer_id, args_list, kwargs_dict, error_type)): |
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_ = transformer.transform(*args_list, **kwargs_dict) |
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boromir674 /
so-magic
