--- a/tests/test_treesum.py	Sat May 17 16:53:16 2025 +0200
+++ b/tests/test_treesum.py	Sat May 17 22:41:22 2025 +0200
@@ -196,6 +196,45 @@
         # accepts uses the digest algorithm from the .treesum file
         self.assertEqual("SHA256", info.algorithm)
 
+    def test_comments_in_treesum_file(self):
+        src_digest_file = os.path.join(DATADIR, "_data.treesum")
+        dst_digest_file = os.path.join(TMPDIR, "_data.treesum")
+
+        with open(src_digest_file, "rb") as src:
+            with open(dst_digest_file, "wb") as dst:
+                first = True
+                lineno = 0
+                while True:
+                    line = src.readline(4096)
+                    if not line:
+                        # write a trailing comment
+                        dst.write("; this is a trailing comment\r\n")
+                        break
+                    if first:
+                        # write a leading comment
+                        dst.write("# this is a leading comment\r\n")
+                        first = False
+                    lineno += 1
+                    dst.write(line)
+                    if lineno == 1:
+                        dst.write(" ;this is a comment after VERSION\n")
+                    elif lineno == 9:
+                        dst.write("#this is a comment after a digest line\r\n")
+        info_opts = cutils.treesum.gen_info_opts(
+            digest_files=[dst_digest_file],
+            last=True)
+        cutils.treesum.print_treesum_digestfile_infos(info_opts)
+        info = cutils.treesum.TreesumInfo.collect_last_from_file(
+            dst_digest_file)
+        self.assertEqual(
+            b"\x69\x6f\xe2\x51\xbe\x94\xbe\xcc\x76\xa5\x91\x24\x1d\x46\x83\xbb\x44\x36\xc7\x9b\x5b\x7b\x62\xb3\xe0\x4a\x0e\xdc\x7e\xc4\x07\xcb",    # noqa: E501 line too long
+            info.digest)
+        # accepts the size within the .treesum file
+        self.assertEqual(67, info.size)
+        # accepts uses the digest algorithm from the .treesum file
+        self.assertEqual("SHA256", info.algorithm)
+        self.assertEqual("4C53C26D", info.crc_checksum)
+
 
 if __name__ == "__main__":
     sys.exit(unittest.main(buffer=True))