def test_corner_value():
"""Test getting the value of the data at the new position."""
shapes = [(40, 20), (20, 10), (10, 5)]
np.random.seed(0)
data = [np.random.random(s) for s in shapes]
layer = Image(data, multiscale=True)
value = layer.get_value()
target_position = (39, 19)
target_level = 0
layer.data_level = target_level
layer.corner_pixels[1] = shapes[target_level] # update requested view
layer.refresh()
# Test position at corner of image
layer.position = target_position
value = layer.get_value()
np.testing.assert_allclose(
value, (target_level, data[target_level][target_position]))
# Test position at outside image
layer.position = (40, 20)
value = layer.get_value()
assert value[1] is None
