def test_opacity():
"""Test setting layer opacity."""
np.random.seed(0)
data = np.random.randint(20, size=(10, 15))
layer = Labels(data)
assert layer.opacity == 0.7
layer.opacity = 0.5
assert layer.opacity == 0.5
layer = Labels(data, opacity=0.6)
assert layer.opacity == 0.6
layer.opacity = 0.3
assert layer.opacity == 0.3
