diff --git a/Tests/test_box_blur.py b/Tests/test_box_blur.py
index 94f504e0b..3bdd5177d 100644
--- a/Tests/test_box_blur.py
+++ b/Tests/test_box_blur.py
@@ -25,7 +25,7 @@ def box_blur(image, radius=1, n=1):
     return image._new(image.im.box_blur(radius, n))
 
 
-def assertImage(im, data, delta=0):
+def assert_image(im, data, delta=0):
     it = iter(im.getdata())
     for data_row in data:
         im_row = [next(it) for _ in range(im.size[0])]
@@ -35,12 +35,12 @@ def assertImage(im, data, delta=0):
         next(it)
 
 
-def assertBlur(im, radius, data, passes=1, delta=0):
+def assert_blur(im, radius, data, passes=1, delta=0):
     # check grayscale image
-    assertImage(box_blur(im, radius, passes), data, delta)
+    assert_image(box_blur(im, radius, passes), data, delta)
     rgba = Image.merge("RGBA", (im, im, im, im))
     for band in box_blur(rgba, radius, passes).split():
-        assertImage(band, data, delta)
+        assert_image(band, data, delta)
 
 
 def test_color_modes():
@@ -64,7 +64,7 @@ def test_color_modes():
 
 
 def test_radius_0():
-    assertBlur(
+    assert_blur(
         sample,
         0,
         [
@@ -80,7 +80,7 @@ def test_radius_0():
 
 
 def test_radius_0_02():
-    assertBlur(
+    assert_blur(
         sample,
         0.02,
         [
@@ -97,7 +97,7 @@ def test_radius_0_02():
 
 
 def test_radius_0_05():
-    assertBlur(
+    assert_blur(
         sample,
         0.05,
         [
@@ -114,7 +114,7 @@ def test_radius_0_05():
 
 
 def test_radius_0_1():
-    assertBlur(
+    assert_blur(
         sample,
         0.1,
         [
@@ -131,7 +131,7 @@ def test_radius_0_1():
 
 
 def test_radius_0_5():
-    assertBlur(
+    assert_blur(
         sample,
         0.5,
         [
@@ -148,7 +148,7 @@ def test_radius_0_5():
 
 
 def test_radius_1():
-    assertBlur(
+    assert_blur(
         sample,
         1,
         [
@@ -165,7 +165,7 @@ def test_radius_1():
 
 
 def test_radius_1_5():
-    assertBlur(
+    assert_blur(
         sample,
         1.5,
         [
@@ -182,7 +182,7 @@ def test_radius_1_5():
 
 
 def test_radius_bigger_then_half():
-    assertBlur(
+    assert_blur(
         sample,
         3,
         [
@@ -199,7 +199,7 @@ def test_radius_bigger_then_half():
 
 
 def test_radius_bigger_then_width():
-    assertBlur(
+    assert_blur(
         sample,
         10,
         [
@@ -214,7 +214,7 @@ def test_radius_bigger_then_width():
 
 
 def test_extreme_large_radius():
-    assertBlur(
+    assert_blur(
         sample,
         600,
         [
@@ -229,7 +229,7 @@ def test_extreme_large_radius():
 
 
 def test_two_passes():
-    assertBlur(
+    assert_blur(
         sample,
         1,
         [
@@ -247,7 +247,7 @@ def test_two_passes():
 
 
 def test_three_passes():
-    assertBlur(
+    assert_blur(
         sample,
         1,
         [
diff --git a/Tests/test_decompression_bomb.py b/Tests/test_decompression_bomb.py
index 1778491ab..b590a84c5 100644
--- a/Tests/test_decompression_bomb.py
+++ b/Tests/test_decompression_bomb.py
@@ -78,7 +78,7 @@ class TestDecompressionCrop:
     def teardown_class(self):
         Image.MAX_IMAGE_PIXELS = ORIGINAL_LIMIT
 
-    def testEnlargeCrop(self):
+    def test_enlarge_crop(self):
         # Crops can extend the extents, therefore we should have the
         # same decompression bomb warnings on them.
         with hopper() as src:
diff --git a/Tests/test_file_gif.py b/Tests/test_file_gif.py
index dffd1006f..fd30cded0 100644
--- a/Tests/test_file_gif.py
+++ b/Tests/test_file_gif.py
@@ -799,31 +799,31 @@ def test_zero_comment_subblocks():
 def test_version(tmp_path):
     out = str(tmp_path / "temp.gif")
 
-    def assertVersionAfterSave(im, version):
+    def assert_version_after_save(im, version):
         im.save(out)
         with Image.open(out) as reread:
             assert reread.info["version"] == version
 
     # Test that GIF87a is used by default
     im = Image.new("L", (100, 100), "#000")
-    assertVersionAfterSave(im, b"GIF87a")
+    assert_version_after_save(im, b"GIF87a")
 
     # Test setting the version to 89a
     im = Image.new("L", (100, 100), "#000")
     im.info["version"] = b"89a"
-    assertVersionAfterSave(im, b"GIF89a")
+    assert_version_after_save(im, b"GIF89a")
 
     # Test that adding a GIF89a feature changes the version
     im.info["transparency"] = 1
-    assertVersionAfterSave(im, b"GIF89a")
+    assert_version_after_save(im, b"GIF89a")
 
     # Test that a GIF87a image is also saved in that format
     with Image.open("Tests/images/test.colors.gif") as im:
-        assertVersionAfterSave(im, b"GIF87a")
+        assert_version_after_save(im, b"GIF87a")
 
         # Test that a GIF89a image is also saved in that format
         im.info["version"] = b"GIF89a"
-        assertVersionAfterSave(im, b"GIF87a")
+        assert_version_after_save(im, b"GIF87a")
 
 
 def test_append_images(tmp_path):
@@ -838,10 +838,10 @@ def test_append_images(tmp_path):
         assert reread.n_frames == 3
 
     # Tests appending using a generator
-    def imGenerator(ims):
+    def im_generator(ims):
         yield from ims
 
-    im.save(out, save_all=True, append_images=imGenerator(ims))
+    im.save(out, save_all=True, append_images=im_generator(ims))
 
     with Image.open(out) as reread:
         assert reread.n_frames == 3
diff --git a/Tests/test_file_pdf.py b/Tests/test_file_pdf.py
index b6f327844..c71d4f5f2 100644
--- a/Tests/test_file_pdf.py
+++ b/Tests/test_file_pdf.py
@@ -131,10 +131,10 @@ def test_save_all(tmp_path):
         assert os.path.getsize(outfile) > 0
 
         # Test appending using a generator
-        def imGenerator(ims):
+        def im_generator(ims):
             yield from ims
 
-        im.save(outfile, save_all=True, append_images=imGenerator(ims))
+        im.save(outfile, save_all=True, append_images=im_generator(ims))
 
     assert os.path.isfile(outfile)
     assert os.path.getsize(outfile) > 0
diff --git a/Tests/test_file_tiff.py b/Tests/test_file_tiff.py
index c53bb87e8..157065ddd 100644
--- a/Tests/test_file_tiff.py
+++ b/Tests/test_file_tiff.py
@@ -655,11 +655,11 @@ class TestFileTiff:
             assert reread.n_frames == 3
 
         # Test appending using a generator
-        def imGenerator(ims):
+        def im_generator(ims):
             yield from ims
 
         mp = BytesIO()
-        im.save(mp, format="TIFF", save_all=True, append_images=imGenerator(ims))
+        im.save(mp, format="TIFF", save_all=True, append_images=im_generator(ims))
 
         mp.seek(0, os.SEEK_SET)
         with Image.open(mp) as reread:
diff --git a/Tests/test_file_tiff_metadata.py b/Tests/test_file_tiff_metadata.py
index b11ab1643..d7a0d9377 100644
--- a/Tests/test_file_tiff_metadata.py
+++ b/Tests/test_file_tiff_metadata.py
@@ -356,7 +356,7 @@ def test_empty_values():
     assert 33432 in info
 
 
-def test_PhotoshopInfo(tmp_path):
+def test_photoshop_info(tmp_path):
     with Image.open("Tests/images/issue_2278.tif") as im:
         assert len(im.tag_v2[34377]) == 70
         assert isinstance(im.tag_v2[34377], bytes)
diff --git a/Tests/test_file_webp_animated.py b/Tests/test_file_webp_animated.py
index 8606f6aaf..c621df0d9 100644
--- a/Tests/test_file_webp_animated.py
+++ b/Tests/test_file_webp_animated.py
@@ -90,14 +90,14 @@ def test_write_animation_RGB(tmp_path):
             check(temp_file1)
 
             # Tests appending using a generator
-            def imGenerator(ims):
+            def im_generator(ims):
                 yield from ims
 
             temp_file2 = str(tmp_path / "temp_generator.webp")
             frame1.copy().save(
                 temp_file2,
                 save_all=True,
-                append_images=imGenerator([frame2]),
+                append_images=im_generator([frame2]),
                 lossless=True,
             )
             check(temp_file2)