def test_lazylist_add_non_iterable_non_lazy_list_rases_value_error():
with raises(ValueError):
LazyList([1]) + None
def test_lazylist_immutable():
ll = LazyList([])
with raises(TypeError):
ll[0] = 1
def test_lazylist_get():
mock_func = Mock()
mock_func.return_value = 1
ll = LazyList([mock_func] * 10)
assert len(ll) == 10
assert ll[0] == 1
def test_lazylist_multi_map_unequal_lengths():
two_func = lambda: 2
double_func = [lambda x: x * 2] * 2
ll = LazyList([two_func])
with raises(ValueError):
ll.map(double_func)
def foo_importer(filepath, **kwargs):
return LazyList([lambda: Image.init_blank((10, 10))])
