diff --git a/Tests/test_file_apng.py b/Tests/test_file_apng.py
index 761bf1589..f80e4822b 100644
--- a/Tests/test_file_apng.py
+++ b/Tests/test_file_apng.py
@@ -388,7 +388,6 @@ def test_apng_save(tmp_path: Path) -> None:
 
     with Image.open(test_file) as im:
         assert isinstance(im, PngImagePlugin.PngImageFile)
-
         im.load()
         assert not im.is_animated
         assert im.n_frames == 1
@@ -405,7 +404,6 @@ def test_apng_save(tmp_path: Path) -> None:
 
     with Image.open(test_file) as im:
         assert isinstance(im, PngImagePlugin.PngImageFile)
-
         im.load()
         assert im.is_animated
         assert im.n_frames == 2
diff --git a/Tests/test_file_jpeg.py b/Tests/test_file_jpeg.py
index 6281e07c2..3787d3b7c 100644
--- a/Tests/test_file_jpeg.py
+++ b/Tests/test_file_jpeg.py
@@ -729,10 +729,10 @@ class TestFileJpeg:
 
     @pytest.mark.skipif(not djpeg_available(), reason="djpeg not available")
     def test_load_djpeg(self) -> None:
-        with Image.open(TEST_FILE) as im:
-            assert isinstance(im, JpegImagePlugin.JpegImageFile)
-            im.load_djpeg()
-            assert_image_similar_tofile(im, TEST_FILE, 5)
+        with Image.open(TEST_FILE) as img:
+            assert isinstance(img, JpegImagePlugin.JpegImageFile)
+            img.load_djpeg()
+            assert_image_similar_tofile(img, TEST_FILE, 5)
 
     @pytest.mark.skipif(not cjpeg_available(), reason="cjpeg not available")
     def test_save_cjpeg(self, tmp_path: Path) -> None:
diff --git a/Tests/test_file_libtiff.py b/Tests/test_file_libtiff.py
index ce932f2c7..6255f6536 100644
--- a/Tests/test_file_libtiff.py
+++ b/Tests/test_file_libtiff.py
@@ -814,7 +814,6 @@ class TestFileLibTiff(LibTiffTestCase):
     def test_multipage_compression(self) -> None:
         with Image.open("Tests/images/compression.tif") as im:
             assert isinstance(im, TiffImagePlugin.TiffImageFile)
-
             im.seek(0)
             assert im._compression == "tiff_ccitt"
             assert im.size == (10, 10)
diff --git a/Tests/test_file_tiff.py b/Tests/test_file_tiff.py
index ee77c61a7..90582dadc 100644
--- a/Tests/test_file_tiff.py
+++ b/Tests/test_file_tiff.py
@@ -121,6 +121,7 @@ class TestFileTiff:
             assert isinstance(im, TiffImagePlugin.TiffImageFile)
 
             outfile = tmp_path / "temp.tif"
+            assert isinstance(im, TiffImagePlugin.TiffImageFile)
             im.save(outfile, save_all=True, append_images=[im], tiffinfo=im.tag_v2)
 
     def test_bigtiff_save(self, tmp_path: Path) -> None:
@@ -393,6 +394,8 @@ class TestFileTiff:
     def test___str__(self) -> None:
         filename = "Tests/images/pil136.tiff"
         with Image.open(filename) as im:
+            assert isinstance(im, TiffImagePlugin.TiffImageFile)
+
             # Act
             assert isinstance(im, TiffImagePlugin.TiffImageFile)
             ret = str(im.ifd)
diff --git a/Tests/test_file_tiff_metadata.py b/Tests/test_file_tiff_metadata.py
index 3d4b2cb35..155ffee7f 100644
--- a/Tests/test_file_tiff_metadata.py
+++ b/Tests/test_file_tiff_metadata.py
@@ -132,7 +132,6 @@ def test_write_metadata(tmp_path: Path) -> None:
     """Test metadata writing through the python code"""
     with Image.open("Tests/images/hopper.tif") as img:
         assert isinstance(img, TiffImagePlugin.TiffImageFile)
-
         f = tmp_path / "temp.tiff"
         del img.tag[278]
         img.save(f, tiffinfo=img.tag)
diff --git a/Tests/test_imagesequence.py b/Tests/test_imagesequence.py
index 7ae9ea84c..32da22e04 100644
--- a/Tests/test_imagesequence.py
+++ b/Tests/test_imagesequence.py
@@ -32,7 +32,6 @@ def test_sanity(tmp_path: Path) -> None:
 def test_iterator() -> None:
     with Image.open("Tests/images/multipage.tiff") as im:
         assert isinstance(im, TiffImagePlugin.TiffImageFile)
-
         i = ImageSequence.Iterator(im)
         for index in range(im.n_frames):
             assert i[index] == next(i)
@@ -45,7 +44,6 @@ def test_iterator() -> None:
 def test_iterator_min_frame() -> None:
     with Image.open("Tests/images/hopper.psd") as im:
         assert isinstance(im, PsdImagePlugin.PsdImageFile)
-
         i = ImageSequence.Iterator(im)
         for index in range(1, im.n_frames):
             assert i[index] == next(i)