def test_is_writes_str_of_non_matching_values_to_mismatch_output():
mismatch_output = []
is_("{}").matches("Hello!", mismatch_output)
assert_equals(["got: Hello!"], mismatch_output)
def test_is_str_uses_value_str():
assert_equals(str(is_("Blah")), "<is: Blah>")
def test_is_does_not_write_to_mismatch_output_if_it_matches():
m = {}
mismatch_output = []
assert is_(None).matches(None, mismatch_output)
assert is_(m).matches(m, mismatch_output)
assert not mismatch_output
def test_is_uses_is_operator():
assert is_(None).matches(None, [])
m = {}
assert is_(m).matches(m, [])
assert not is_({}).matches({}, [])
