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Test that n_frames and is_animated do not change the image

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This commit is contained in:
Andrew Murray 2022-02-22 08:55:02 +11:00
parent 9e6537df5a
commit 9006836c28
1 changed files with 16 additions and 0 deletions
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16
Tests/test_file_gif.py
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@ -308,6 +308,22 @@ def test_n_frames():
assert im.is_animated == (n_frames != 1)
def test_no_change():
# Test n_frames does not change the image
with Image.open("Tests/images/dispose_bgnd.gif") as im:
im.seek(1)
expected = im.copy()
assert im.n_frames == 5
assert_image_equal(im, expected)
# Test is_animated does not change the image
with Image.open("Tests/images/dispose_bgnd.gif") as im:
im.seek(3)
expected = im.copy()
assert im.is_animated
assert_image_equal(im, expected)
def test_eoferror():
with Image.open(TEST_GIF) as im:
n_frames = im.n_frames