diff --git a/Tests/test_file_gif.py b/Tests/test_file_gif.py
index 48c70db8a..4e790926b 100644
--- a/Tests/test_file_gif.py
+++ b/Tests/test_file_gif.py
@@ -1252,10 +1252,11 @@ def test_palette_save_L(tmp_path: Path) -> None:
 
     im = hopper("P")
     im_l = Image.frombytes("L", im.size, im.tobytes())
-    palette = bytes(im.getpalette())
+    palette = im.getpalette()
+    assert palette is not None
 
     out = str(tmp_path / "temp.gif")
-    im_l.save(out, palette=palette)
+    im_l.save(out, palette=bytes(palette))
 
     with Image.open(out) as reloaded:
         assert_image_equal(reloaded.convert("RGB"), im.convert("RGB"))
diff --git a/Tests/test_file_jpeg.py b/Tests/test_file_jpeg.py
index f24faecaa..33f9ce00e 100644
--- a/Tests/test_file_jpeg.py
+++ b/Tests/test_file_jpeg.py
@@ -154,7 +154,7 @@ class TestFileJpeg:
             assert k > 0.9
 
     def test_rgb(self) -> None:
-        def getchannels(im: Image.Image) -> tuple[int, int, int]:
+        def getchannels(im: JpegImagePlugin.JpegImageFile) -> tuple[int, int, int]:
             return tuple(v[0] for v in im.layer)
 
         im = hopper()
@@ -443,7 +443,7 @@ class TestFileJpeg:
         assert_image(im1, im2.mode, im2.size)
 
     def test_subsampling(self) -> None:
-        def getsampling(im: Image.Image):
+        def getsampling(im: JpegImagePlugin.JpegImageFile):
             layer = im.layer
             return layer[0][1:3] + layer[1][1:3] + layer[2][1:3]
 
diff --git a/Tests/test_file_libtiff.py b/Tests/test_file_libtiff.py
index 6c13999a5..22bcd2856 100644
--- a/Tests/test_file_libtiff.py
+++ b/Tests/test_file_libtiff.py
@@ -668,7 +668,8 @@ class TestFileLibTiff(LibTiffTestCase):
             pilim.save(buffer_io, format="tiff", compression=compression)
             buffer_io.seek(0)
 
-            assert_image_similar_tofile(pilim, buffer_io, 0)
+            with Image.open(buffer_io) as saved_im:
+                assert_image_similar(pilim, saved_im, 0)
 
         save_bytesio()
         save_bytesio("raw")
diff --git a/Tests/test_image.py b/Tests/test_image.py
index c7694a0ef..d6a739c79 100644
--- a/Tests/test_image.py
+++ b/Tests/test_image.py
@@ -25,6 +25,7 @@ from PIL import (
 from .helper import (
     assert_image_equal,
     assert_image_equal_tofile,
+    assert_image_similar,
     assert_image_similar_tofile,
     assert_not_all_same,
     hopper,
@@ -193,7 +194,8 @@ class TestImage:
         with tempfile.TemporaryFile() as fp:
             im.save(fp, "JPEG")
             fp.seek(0)
-            assert_image_similar_tofile(im, fp, 20)
+            with Image.open(fp) as reloaded:
+                assert_image_similar(im, reloaded, 20)
 
     def test_unknown_extension(self, tmp_path: Path) -> None:
         im = hopper()
diff --git a/Tests/test_image_array.py b/Tests/test_image_array.py
index 342bd8654..d7e6c562c 100644
--- a/Tests/test_image_array.py
+++ b/Tests/test_image_array.py
@@ -86,8 +86,8 @@ def test_fromarray() -> None:
     assert test("RGBX") == ("RGBA", (128, 100), True)
 
     # Test mode is None with no "typestr" in the array interface
+    wrapped = Wrapper(hopper("L"), {"shape": (100, 128)})
     with pytest.raises(TypeError):
-        wrapped = Wrapper(test("L"), {"shape": (100, 128)})
         Image.fromarray(wrapped)
 
 
diff --git a/Tests/test_image_crop.py b/Tests/test_image_crop.py
index d095364ba..07fec2e64 100644
--- a/Tests/test_image_crop.py
+++ b/Tests/test_image_crop.py
@@ -18,7 +18,7 @@ def test_crop(mode: str) -> None:
 
 
 def test_wide_crop() -> None:
-    def crop(*bbox: int) -> tuple[int, ...]:
+    def crop(bbox: tuple[int, int, int, int]) -> tuple[int, ...]:
         i = im.crop(bbox)
         h = i.histogram()
         while h and not h[-1]:
@@ -27,23 +27,23 @@ def test_wide_crop() -> None:
 
     im = Image.new("L", (100, 100), 1)
 
-    assert crop(0, 0, 100, 100) == (0, 10000)
-    assert crop(25, 25, 75, 75) == (0, 2500)
+    assert crop((0, 0, 100, 100)) == (0, 10000)
+    assert crop((25, 25, 75, 75)) == (0, 2500)
 
     # sides
-    assert crop(-25, 0, 25, 50) == (1250, 1250)
-    assert crop(0, -25, 50, 25) == (1250, 1250)
-    assert crop(75, 0, 125, 50) == (1250, 1250)
-    assert crop(0, 75, 50, 125) == (1250, 1250)
+    assert crop((-25, 0, 25, 50)) == (1250, 1250)
+    assert crop((0, -25, 50, 25)) == (1250, 1250)
+    assert crop((75, 0, 125, 50)) == (1250, 1250)
+    assert crop((0, 75, 50, 125)) == (1250, 1250)
 
-    assert crop(-25, 25, 125, 75) == (2500, 5000)
-    assert crop(25, -25, 75, 125) == (2500, 5000)
+    assert crop((-25, 25, 125, 75)) == (2500, 5000)
+    assert crop((25, -25, 75, 125)) == (2500, 5000)
 
     # corners
-    assert crop(-25, -25, 25, 25) == (1875, 625)
-    assert crop(75, -25, 125, 25) == (1875, 625)
-    assert crop(75, 75, 125, 125) == (1875, 625)
-    assert crop(-25, 75, 25, 125) == (1875, 625)
+    assert crop((-25, -25, 25, 25)) == (1875, 625)
+    assert crop((75, -25, 125, 25)) == (1875, 625)
+    assert crop((75, 75, 125, 125)) == (1875, 625)
+    assert crop((-25, 75, 25, 125)) == (1875, 625)
 
 
 @pytest.mark.parametrize("box", ((8, 2, 2, 8), (2, 8, 8, 2), (8, 8, 2, 2)))
diff --git a/Tests/test_image_filter.py b/Tests/test_image_filter.py
index 47f9ffa3d..1f0644471 100644
--- a/Tests/test_image_filter.py
+++ b/Tests/test_image_filter.py
@@ -46,9 +46,9 @@ def test_sanity(filter_to_apply: ImageFilter.Filter, mode: str) -> None:
 
 @pytest.mark.parametrize("mode", ("L", "I", "RGB", "CMYK"))
 def test_sanity_error(mode: str) -> None:
+    im = hopper(mode)
     with pytest.raises(TypeError):
-        im = hopper(mode)
-        im.filter("hello")
+        im.filter("hello")  # type: ignore[arg-type]
 
 
 # crashes on small images
diff --git a/Tests/test_image_getextrema.py b/Tests/test_image_getextrema.py
index a5b974459..de5956f3e 100644
--- a/Tests/test_image_getextrema.py
+++ b/Tests/test_image_getextrema.py
@@ -6,7 +6,7 @@ from .helper import hopper
 
 
 def test_extrema() -> None:
-    def extrema(mode: str) -> tuple[int, int] | tuple[tuple[int, int], ...]:
+    def extrema(mode: str) -> tuple[float, float] | tuple[tuple[int, int], ...]:
         return hopper(mode).getextrema()
 
     assert extrema("1") == (0, 255)
diff --git a/Tests/test_imagecms.py b/Tests/test_imagecms.py
index 082eb8162..55f72c3b9 100644
--- a/Tests/test_imagecms.py
+++ b/Tests/test_imagecms.py
@@ -247,7 +247,7 @@ def test_invalid_color_temperature() -> None:
         ImageCms.PyCMSError,
         match='Color temperature must be numeric, "invalid" not valid',
     ):
-        ImageCms.createProfile("LAB", "invalid")
+        ImageCms.createProfile("LAB", "invalid")  # type: ignore[arg-type]
 
 
 @pytest.mark.parametrize("flag", ("my string", -1))
@@ -256,7 +256,7 @@ def test_invalid_flag(flag: str | int) -> None:
         with pytest.raises(
             ImageCms.PyCMSError, match="flags must be an integer between 0 and "
         ):
-            ImageCms.profileToProfile(im, "foo", "bar", flags=flag)
+            ImageCms.profileToProfile(im, "foo", "bar", flags=flag)  # type: ignore[arg-type]
 
 
 def test_simple_lab() -> None:
@@ -588,11 +588,13 @@ def assert_aux_channel_preserved(
     )
 
     # apply transform
+    result_image: Image.Image | None
     if transform_in_place:
         ImageCms.applyTransform(source_image, t, inPlace=True)
         result_image = source_image
     else:
         result_image = ImageCms.applyTransform(source_image, t, inPlace=False)
+    assert result_image is not None
     result_image_aux = result_image.getchannel(preserved_channel)
 
     assert_image_equal(source_image_aux, result_image_aux)
@@ -650,6 +652,7 @@ def test_auxiliary_channels_isolated() -> None:
                 )
 
                 # test conversion from aux-ful source
+                test_image: Image.Image | None
                 if transform_in_place:
                     test_image = source_image.copy()
                     ImageCms.applyTransform(test_image, test_transform, inPlace=True)
@@ -657,6 +660,7 @@ def test_auxiliary_channels_isolated() -> None:
                     test_image = ImageCms.applyTransform(
                         source_image, test_transform, inPlace=False
                     )
+                assert test_image is not None
 
                 # reference conversion from aux-less source
                 reference_transform = ImageCms.buildTransform(
diff --git a/Tests/test_imagedraw.py b/Tests/test_imagedraw.py
index 69d09e03d..c221fe008 100644
--- a/Tests/test_imagedraw.py
+++ b/Tests/test_imagedraw.py
@@ -1083,8 +1083,8 @@ def test_line_horizontal() -> None:
     )
 
 
+@pytest.mark.xfail(reason="failing test")
 def test_line_h_s1_w2() -> None:
-    pytest.skip("failing")
     img, draw = create_base_image_draw((20, 20))
     draw.line((5, 5, 14, 6), BLACK, 2)
     assert_image_equal_tofile(