def test_inconsistent_position_error(self):
with pytest.raises(IndexError):
replace_many(f(a), [((), b), ((0, ), b)])
with pytest.raises(IndexError):
replace_many(a, [((), b), ((0, ), b)])
with pytest.raises(IndexError):
replace_many(a, [((0, ), b), ((1, ), b)])
def many_replace_wrapper(expression, position, replacement):
return replace_many(expression, [(position, replacement)])
def test_empty_replace(self):
expression = f(a, b)
result = replace_many(expression, [])
assert expression is result, "Empty replacements should not change the expression."
def test_substitution_match(self, expression, replacements, expected_result):
result = replace_many(expression, replacements)
assert result == expected_result, "Replacement did not yield expected result ({!r} -> {!r})".format(
expression, replacements
)
assert result is not expression, "Replacement modified the original expression"