Test using _seek to skip frames (python-pillow#8804)

Co-authored-by: Andrew Murray <[email protected]>
radarhere · Mar 6, 2025 · e946c7b · e946c7b
1 parent 5ba72a9
commit e946c7b
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Showing 3 changed files with 11 additions and 1 deletion.
diff --git a/Tests/test_file_apng.py b/Tests/test_file_apng.py
@@ -34,8 +34,11 @@ def test_apng_basic() -> None:
         with pytest.raises(EOFError):
             im.seek(2)
 
-        # test rewind support
         im.seek(0)
+        with pytest.raises(ValueError, match="cannot seek to frame 2"):
+            im._seek(2)
+
+        # test rewind support
         assert im.getpixel((0, 0)) == (255, 0, 0, 255)
         assert im.getpixel((64, 32)) == (255, 0, 0, 255)
         im.seek(1)

diff --git a/Tests/test_file_fli.py b/Tests/test_file_fli.py
@@ -160,6 +160,9 @@ def test_seek() -> None:
 
         assert_image_equal_tofile(im, "Tests/images/a_fli.png")
 
+        with pytest.raises(ValueError, match="cannot seek to frame 52"):
+            im._seek(52)
+
 
 @pytest.mark.parametrize(
     "test_file",

diff --git a/Tests/test_file_gif.py b/Tests/test_file_gif.py
@@ -410,6 +410,10 @@ def test_seek() -> None:
         except EOFError:
             assert frame_count == 5
 
+        img.seek(0)
+        with pytest.raises(ValueError, match="cannot seek to frame 2"):
+            img._seek(2)
+
 
 def test_seek_info() -> None:
     with Image.open("Tests/images/iss634.gif") as im: