python-pillow
diff --git a/‎Tests/test_file_gif.py
Lines changed: 6 additions & 3 deletions b/‎Tests/test_file_gif.py
Lines changed: 6 additions & 3 deletions
@@ -53,6 +53,7 @@ def test_closed_file() -> None:
 
 def test_seek_after_close() -> None:
     im = Image.open("Tests/images/iss634.gif")
+    assert isinstance(im, GifImagePlugin.GifImageFile)
     im.load()
     im.close()
 
@@ -377,7 +378,8 @@ def test_save_netpbm_bmp_mode(tmp_path: Path) -> None:
         img = img.convert("RGB")
 
         tempfile = str(tmp_path / "temp.gif")
-        GifImagePlugin._save_netpbm(img, 0, tempfile)
+        b = BytesIO()
+        GifImagePlugin._save_netpbm(img, b, tempfile)
         with Image.open(tempfile) as reloaded:
             assert_image_similar(img, reloaded.convert("RGB"), 0)
 
@@ -388,7 +390,8 @@ def test_save_netpbm_l_mode(tmp_path: Path) -> None:
         img = img.convert("L")
 
         tempfile = str(tmp_path / "temp.gif")
-        GifImagePlugin._save_netpbm(img, 0, tempfile)
+        b = BytesIO()
+        GifImagePlugin._save_netpbm(img, b, tempfile)
         with Image.open(tempfile) as reloaded:
             assert_image_similar(img, reloaded.convert("L"), 0)
 
@@ -648,7 +651,7 @@ def test_dispose2_palette(tmp_path: Path) -> None:
             assert rgb_img.getpixel((50, 50)) == circle
 
             # Check that frame transparency wasn't added unnecessarily
-            assert img._frame_transparency is None
+            assert getattr(img, "_frame_transparency") is None
 
 
 def test_dispose2_diff(tmp_path: Path) -> None: