def test_viewer_with_overlay():
img = data.coins()
ov = OverlayPlugin(image_filter=sobel)
viewer = ImageViewer(img)
viewer += ov
import tempfile
_, filename = tempfile.mkstemp(suffix='.png')
ov.color = 3
assert_equal(ov.color, 'yellow')
viewer.save_to_file(filename)
ov.display_filtered_image(img)
assert_equal(ov.overlay, img)
ov.overlay = None
assert_equal(ov.overlay, None)
ov.overlay = img
assert_equal(ov.overlay, img)
assert_equal(ov.filtered_image, img)
def test_viewer_with_overlay():
img = data.coins()
ov = OverlayPlugin(image_filter=sobel)
viewer = ImageViewer(img)
viewer += ov
import tempfile
_, filename = tempfile.mkstemp(suffix='.png')
ov.color = 3
assert_equal(ov.color, 'yellow')
viewer.save_to_file(filename)
ov.display_filtered_image(img)
assert_equal(ov.overlay, img)
ov.overlay = None
assert_equal(ov.overlay, None)
ov.overlay = img
assert_equal(ov.overlay, img)
assert_equal(ov.filtered_image, img)