def test_unlink_single_layer():
"""Test that we can unlink a single layer from all others."""
l1 = layers.Points(None)
l2 = layers.Points(None)
l3 = layers.Points(None)
link_layers([l1, l2, l3])
assert len(l1.events.opacity.callbacks) == 2
unlink_layers([l1], ('opacity', )) # just unlink L1 opacicity from others
assert len(l1.events.opacity.callbacks) == 0
assert len(l2.events.opacity.callbacks) == 1
assert len(l3.events.opacity.callbacks) == 1
# blending was untouched
assert len(l1.events.blending.callbacks) == 2
assert len(l2.events.blending.callbacks) == 2
assert len(l3.events.blending.callbacks) == 2
unlink_layers([l1]) # completely unlink L1 from everything
assert not l1.events.blending.callbacks
def test_unlink_layers():
"""Test that we can unlink layers."""
l1 = layers.Points(None)
l2 = layers.Points(None)
l3 = layers.Points(None)
link_layers([l1, l2, l3])
assert len(l1.events.opacity.callbacks) == 2
unlink_layers([l1, l2], ('opacity', )) # just unlink opacity on l1/l2
assert len(l1.events.opacity.callbacks) == 1
assert len(l2.events.opacity.callbacks) == 1
# l3 is still connected to them both
assert len(l3.events.opacity.callbacks) == 2
# blending was untouched
assert len(l1.events.blending.callbacks) == 2
assert len(l2.events.blending.callbacks) == 2
assert len(l3.events.blending.callbacks) == 2
unlink_layers([l1, l2, l3]) # unlink everything
assert len(l1.events.blending.callbacks) == 0
assert len(l2.events.blending.callbacks) == 0
assert len(l3.events.blending.callbacks) == 0