def test_lens_and():
my_lens = b.EachTraversal() & b.GetitemLens(1)
assert my_lens.set([(0, 1), (2, 3)], 4) == [(0, 4), (2, 4)]
def test_cannot_preview_with_setter():
with pytest.raises(TypeError):
b.ForkedSetter(b.GetitemLens(0), b.GetitemLens(1)).preview([1, 2])
def test_cannot_to_list_of_with_setter():
with pytest.raises(TypeError):
b.ForkedSetter(b.GetitemLens(0), b.GetitemLens(1)).to_list_of([1, 2])
def test_ZoomTraversal_view():
l = b.GetitemLens(0) & b.ZoomTraversal()
data = [bind([1, 2, 3])[1]]
assert l.view(data) == 2
def test_ZoomTraversal_set():
l = b.GetitemLens(0) & b.ZoomTraversal()
data = [bind([1, 2, 3])[1]]
assert l.set(data, 7) == [[1, 7, 3]]
def test_ItemsTraversal_over_empty():
my_lens = b.ItemsTraversal() & b.GetitemLens(0)
assert my_lens.over({}, lambda a: a + 1) == {}
def test_ItemsTraversal_over():
data = {0: 'zero', 1: 'one'}
my_lens = b.ItemsTraversal() & b.GetitemLens(0)
assert my_lens.over(data, lambda a: a + 1) == {1: 'zero', 2: 'one'}
def test_GetitemLens_set():
assert b.GetitemLens(0).set([1, 2, 3], 4) == [4, 2, 3]
def test_GetitemLens_view():
assert b.GetitemLens(0).view([1, 2, 3]) == 1
def test_ItemsTraversal_over():
data = {0: "zero", 1: "one"}
my_lens = b.ItemsTraversal() & b.GetitemLens(0)
assert my_lens.over(data, lambda a: a + 1) == {1: "zero", 2: "one"}
