def test_contour(input_data, expected_data_view):
"""Test changing contour."""
layer = Labels(input_data)
assert layer.contour == 0
np.testing.assert_array_equal(layer.data, input_data)
np.testing.assert_array_equal(
layer._raw_to_displayed(input_data), layer._data_view
)
data_view_before_contour = layer._data_view.copy()
layer.contour = 1
assert layer.contour == 1
# Check `layer.data` didn't change
np.testing.assert_array_equal(layer.data, input_data)
# Check what is returned in the view of the data
np.testing.assert_array_equal(
layer._data_view,
np.where(
expected_data_view > 0,
low_discrepancy_image(expected_data_view),
0,
),
)
# Check the view of the data changed after setting the contour
with np.testing.assert_raises(AssertionError):
np.testing.assert_array_equal(
data_view_before_contour, layer._data_view
)
layer.contour = 0
assert layer.contour == 0
# Check it's in the same state as before setting the contour
np.testing.assert_array_equal(
layer._raw_to_displayed(input_data), layer._data_view
)
