class TestEvery:
@pytest.mark.parametrize(
"predicate, iterable",
[
(generic.identical(1), [1, 1, 1]),
(generic.identical(1), []),
(numeric.greater(0), [1, 2]),
(generic.equal("a"), "aa"),
],
)
def test_returns_true_for_complete_iterable(self,
predicate: Predicate[object],
iterable: Iterable) -> None:
assert collection.every(predicate)(iterable) is True
@pytest.mark.parametrize(
"predicate, iterable",
[
(generic.identical(...), [..., "b", "c"]),
(numeric.greater(1), [-3, 0, 1, 0, 2]),
(generic.equal("a"), "abc"),
],
)
def test_returns_false_for_incomplete_iterable(
self, predicate: Predicate[object], iterable: Iterable) -> None:
assert collection.every(predicate)(iterable) is False
def test_repr_contains_bound_parameter(self):
assert_predicate_name_equals(collection.every(numeric.greater(42)),
"every(greater(42))")
class TestExists:
@pytest.mark.parametrize(
"predicate, iterable",
[
(generic.identical(...), ["a", "b", ...]),
(numeric.greater(0), [-3, 0, 1, 0]),
(generic.equal("a"), "cbad"),
],
)
def test_returns_true_for_iterable_containing_satisfying_item(
self, predicate: Predicate[object], iterable: Iterable) -> None:
assert collection.exists(predicate)(iterable) is True
@pytest.mark.parametrize(
"predicate, iterable",
[
(generic.identical(...), ["a", "b", "c"]),
(numeric.greater(1), [-3, 0, 1, 0]),
(generic.equal("a"), "cbed"),
],
)
def test_returns_false_for_iterable_not_containing_satisfying_item(
self, predicate: Predicate[object], iterable: Iterable) -> None:
assert collection.exists(predicate)(iterable) is False
def test_repr_contains_bound_parameter(self):
assert_predicate_name_equals(collection.exists(numeric.less(-3)),
"exists(less(-3))")
def test_repr_contains_bound_parameter(self):
assert_predicate_name_equals(generic.identical("hello"),
"identical('hello')")
def test_returns_false_for_different_values(self, a: object,
b: object) -> None:
assert generic.identical(a)(b) is False
assert generic.identical(b)(a) is False
def test_returns_true_for_identical_values(self, a: object,
b: object) -> None:
assert generic.identical(a)(b) is True
assert generic.identical(b)(a) is True