def test_both_throws():
def callback(**_):
assert False
with pytest.raises(TypeError) as e:
check_candidate(control_raises, candidate_raises, callback)
assert e.value is control_exception
def test_golden_path():
def callback(**_):
assert False
assert check_candidate(
lambda a, b: a + b,
lambda a, b: a + b,
callback,
1,
b=2,
) == 3
def test_old_code_raised_new_code_did_not():
callback_kwargs = {}
def callback(**kwargs):
callback_kwargs.update(kwargs)
with pytest.raises(TypeError) as e:
check_candidate(
control_raises,
lambda: 1,
callback,
)
assert e.value is control_exception
assert callback_kwargs == dict(
control_result=None,
candidate_result=1,
control_exception=control_exception,
candidate_exception=None,
reason='old code raised, new did not',
)
def test_both_throws_but_different_data():
callback_kwargs = {}
def callback(**kwargs):
callback_kwargs.update(kwargs)
wrong_exception = TypeError('wrong data!')
def candidate_raises_wrong_type():
raise wrong_exception
with pytest.raises(TypeError) as e:
check_candidate(control_raises, candidate_raises_wrong_type, callback)
assert e.value is control_exception
assert callback_kwargs == dict(
control_result=None,
candidate_result=None,
control_exception=control_exception,
candidate_exception=wrong_exception,
reason='new and old both raised exception, but with different data',
)
def test_new_code_raised_old_code_did_not():
callback_kwargs = {}
def callback(**kwargs):
callback_kwargs.update(kwargs)
assert check_candidate(
lambda: 1,
candidate_raises,
callback,
) == 1
assert callback_kwargs == dict(
control_result=1,
candidate_result=None,
control_exception=None,
candidate_exception=candidate_exception,
reason='new code raised, old did not',
)
def test_different_return_value():
callback_kwargs = {}
def callback(**kwargs):
callback_kwargs.update(kwargs)
assert check_candidate(
lambda: 1,
lambda: 2,
callback,
) == 1
assert callback_kwargs == dict(
control_result=1,
candidate_result=2,
control_exception=None,
candidate_exception=None,
reason='different results',
)