def test_num_colors():
"""Test setting number of colors in colormap."""
np.random.seed(0)
data = np.random.randint(20, size=(10, 15))
layer = Labels(data)
assert layer.num_colors == 50
layer.num_colors = 80
assert layer.num_colors == 80
layer = Labels(data, num_colors=60)
assert layer.num_colors == 60
