Improved test coverage

Tests/helper.py

@@ -140,18 +140,11 @@ def assert_image_similar_tofile(
     filename: str,
     epsilon: float,
     msg: str | None = None,
-    mode: str | None = None,
 ) -> None:
     with Image.open(filename) as img:
-        if mode:
-            img = img.convert(mode)
         assert_image_similar(a, img, epsilon, msg)
 
 
-def assert_all_same(items: Sequence[Any], msg: str | None = None) -> None:
-    assert items.count(items[0]) == len(items), msg
-
-
 def assert_not_all_same(items: Sequence[Any], msg: str | None = None) -> None:
     assert items.count(items[0]) != len(items), msg
 

Tests/test_file_apng.py

@@ -307,13 +307,8 @@ def test_apng_syntax_errors() -> None:
             im.load()
 
     # we can handle this case gracefully
-    exception = None
     with Image.open("Tests/images/apng/syntax_num_frames_low.png") as im:
-        try:
-            im.seek(im.n_frames - 1)
-        except Exception as e:
-            exception = e
-        assert exception is None
+        im.seek(im.n_frames - 1)
 
     with pytest.raises(OSError):
         with Image.open("Tests/images/apng/syntax_num_frames_high.png") as im:
@@ -405,13 +400,8 @@ def test_apng_save_split_fdat(tmp_path: Path) -> None:
             append_images=frames,
         )
     with Image.open(test_file) as im:
-        exception = None
-        try:
-            im.seek(im.n_frames - 1)
-            im.load()
-        except Exception as e:
-            exception = e
-        assert exception is None
+        im.seek(im.n_frames - 1)
+        im.load()
 
 
 def test_apng_save_duration_loop(tmp_path: Path) -> None:

Tests/test_file_iptc.py

@@ -58,10 +58,7 @@ def test_getiptcinfo_fotostation() -> None:
 
     # Assert
     assert iptc is not None
-    for tag in iptc.keys():
-        if tag[0] == 240:
-            return
-    pytest.fail("FotoStation tag not found")
+    assert 240 in (tag[0] for tag in iptc.keys()), "FotoStation tag not found"
 
 
 def test_getiptcinfo_zero_padding() -> None:

Tests/test_file_jpeg2k.py

@@ -492,8 +492,7 @@ def test_plt_marker(card: ImageFile.ImageFile) -> None:
     out.seek(0)
     while True:
         marker = out.read(2)
-        if not marker:
-            pytest.fail("End of stream without PLT")
+        assert marker, "End of stream without PLT"
 
         jp2_boxid = _binary.i16be(marker)
         if jp2_boxid == 0xFF4F:

Tests/test_file_libtiff.py

@@ -36,11 +36,7 @@ def _assert_noerr(self, tmp_path: Path, im: TiffImagePlugin.TiffImageFile) -> No
         im.load()
         im.getdata()
 
-        try:
-            assert im._compression == "group4"
-        except AttributeError:
-            print("No _compression")
-            print(dir(im))
+        assert im._compression == "group4"
 
         # can we write it back out, in a different form.
         out = str(tmp_path / "temp.png")

Tests/test_image.py

@@ -189,8 +189,6 @@ def test_pathlib(self, tmp_path: Path) -> None:
                 if ext == ".jp2" and not features.check_codec("jpg_2000"):
                     pytest.skip("jpg_2000 not available")
                 temp_file = str(tmp_path / ("temp." + ext))
-                if os.path.exists(temp_file):
-                    os.remove(temp_file)
                 im.save(Path(temp_file))
 
     def test_fp_name(self, tmp_path: Path) -> None: