diff --git a/tests/test_glyph_file_util.py b/tests/test_glyph_file_util.py
index bc5771a..0597d3c 100644
--- a/tests/test_glyph_file_util.py
+++ b/tests/test_glyph_file_util.py
@@ -17,7 +17,7 @@ def test_glyph_file_1():
 
 def test_glyph_file_2():
     with pytest.raises(ValueError) as info:
-        glyph_file = GlyphFile.load(Path('notdef a,b.png'))
+        GlyphFile.load(Path('notdef a,b.png'))
     assert info.value.args[0] == "'notdef' can't have flavors: 'notdef a,b.png'"
 
 
@@ -29,7 +29,7 @@ def test_glyph_file_3():
 
 
 def test_glyph_file_4():
-    glyph_file = GlyphFile.load(Path('4E00 a,b,c,b,a.png'))
+    glyph_file = GlyphFile.load(Path('4E00 A,b,C,b,a.png'))
     assert glyph_file.code_point == 0x4E00
     assert glyph_file.flavors == ['a', 'b', 'c']
     assert glyph_file.glyph_name == '4E00-A'
diff --git a/tests/test_mono_bitmap.py b/tests/test_mono_bitmap.py
index fd29570..b94ed49 100644
--- a/tests/test_mono_bitmap.py
+++ b/tests/test_mono_bitmap.py
@@ -1,4 +1,3 @@
-import hashlib
 from io import BytesIO
 from pathlib import Path
 
@@ -7,10 +6,6 @@
 from pixel_font_knife.mono_bitmap import MonoBitmap
 
 
-def _sha256(data: bytes) -> str:
-    return hashlib.sha256(data).hexdigest()
-
-
 def test_init():
     bitmap = MonoBitmap([
         [0, 1, 2, 3],
@@ -235,13 +230,13 @@ def test_load_dump_save(glyphs_dir: Path, tmp_path: Path):
         black_bitmap.save_png(black_save_path)
         black_stream = BytesIO()
         black_bitmap.dump_png(black_stream)
-        assert _sha256(black_load_path.read_bytes()) == _sha256(black_save_path.read_bytes()) == _sha256(black_stream.getvalue())
+        assert black_load_path.read_bytes() == black_save_path.read_bytes() == black_stream.getvalue()
 
         red_save_path = red_save_dir.joinpath(red_load_path.name)
         red_bitmap.save_png(red_save_path, color=(255, 0, 0))
         red_stream = BytesIO()
         red_bitmap.dump_png(red_stream, color=(255, 0, 0))
-        assert _sha256(red_load_path.read_bytes()) == _sha256(red_save_path.read_bytes()) == _sha256(red_stream.getvalue())
+        assert red_load_path.read_bytes() == red_save_path.read_bytes() == red_stream.getvalue()
 
 
 def test_bold_s4_r1_e1(glyphs_dir: Path):