Assert pixel data is tuple

Tests/test_file_gif.py

@@ -540,7 +540,9 @@ def test_dispose_background_transparency() -> None:
         img.seek(2)
         px = img.load()
         assert px is not None
-        assert px[35, 30][3] == 0
+        value = px[35, 30]
+        assert isinstance(value, tuple)
+        assert value[3] == 0
 
 
 @pytest.mark.parametrize(
@@ -1479,7 +1481,9 @@ def test_saving_rgba(tmp_path: Path) -> None:
 
     with Image.open(out) as reloaded:
         reloaded_rgba = reloaded.convert("RGBA")
-        assert reloaded_rgba.load()[0, 0][3] == 0
+        value = reloaded_rgba.load()[0, 0]
+        assert isinstance(value, tuple)
+        assert value[3] == 0
 
 
 @pytest.mark.parametrize("params", ({}, {"disposal": 2, "optimize": False}))

Tests/test_file_jpeg.py

@@ -133,15 +133,17 @@ class TestFileJpeg:
         f = "Tests/images/pil_sample_cmyk.jpg"
         with Image.open(f) as im:
             # the source image has red pixels in the upper left corner.
-            c, m, y, k = (x / 255.0 for x in im.getpixel((0, 0)))
+            cmyk = im.getpixel((0, 0))
+            assert isinstance(cmyk, tuple)
+            c, m, y, k = (x / 255.0 for x in cmyk)
             assert c == 0.0
             assert m > 0.8
             assert y > 0.8
             assert k == 0.0
             # the opposite corner is black
-            c, m, y, k = (
-                x / 255.0 for x in im.getpixel((im.size[0] - 1, im.size[1] - 1))
-            )
+            cmyk = im.getpixel((im.size[0] - 1, im.size[1] - 1))
+            assert isinstance(cmyk, tuple)
+            k = cmyk[3] / 255.0
             assert k > 0.9
             # roundtrip, and check again
             im = self.roundtrip(im)

Tests/test_file_tga.py

@@ -220,12 +220,16 @@ def test_horizontal_orientations() -> None:
     with Image.open("Tests/images/rgb32rle_top_right.tga") as im:
         px = im.load()
         assert px is not None
-        assert px[90, 90][:3] == (0, 0, 0)
+        value = px[90, 90]
+        assert isinstance(value, tuple)
+        assert value[:3] == (0, 0, 0)
 
     with Image.open("Tests/images/rgb32rle_bottom_right.tga") as im:
         px = im.load()
         assert px is not None
-        assert px[90, 90][:3] == (0, 255, 0)
+        value = px[90, 90]
+        assert isinstance(value, tuple)
+        assert value[:3] == (0, 255, 0)
 
 
 def test_save_rle(tmp_path: Path) -> None:

Tests/test_file_webp.py

@@ -219,6 +219,7 @@ class TestFileWebp:
         # Save P mode GIF with background
         with Image.open("Tests/images/chi.gif") as im:
             original_value = im.convert("RGB").getpixel((1, 1))
+            assert isinstance(original_value, tuple)
 
             # Save as WEBP
             im.save(out_webp, save_all=True)
@@ -230,6 +231,7 @@ class TestFileWebp:
 
         with Image.open(out_gif) as reread:
             reread_value = reread.convert("RGB").getpixel((1, 1))
+        assert isinstance(reread_value, tuple)
         difference = sum(abs(original_value[i] - reread_value[i]) for i in range(3))
         assert difference < 5