Added the initial version that works.

tests/test_algo.py

@@ -0,0 +1,51 @@
+# The Flask HTTP Digest Authentication Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2022/10/30
+
+#  Copyright (c) 2022 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+"""The test case for the HTTP digest authentication algorithm.
+
+"""
+import typing as t
+import unittest
+
+from flask_digest_auth import make_password_hash, calc_response
+
+
+class AlgorithmTestCase(unittest.TestCase):
+    """The test case for the HTTP digest authentication algorithm."""
+
+    def test_response_value(self) -> None:
+        """Tests the response value.
+        See https://en.wikipedia.org/wiki/Digest_access_authentication.
+
+        :return: None.
+        """
+        realm: str = "testrealm@host.com"
+        username: str = "Mufasa"
+        password: str = "Circle Of Life"
+        method: str = "GET"
+        uri: str = "/dir/index.html"
+        nonce: str = "dcd98b7102dd2f0e8b11d0f600bfb0c093"
+        qop: t.Optional[t.Literal["auth", "auth-int"]] = "auth"
+        algorithm: t.Optional[t.Literal["MD5", "MD5-sess"]] = None
+        cnonce: t.Optional[str] = "0a4f113b"
+        nc: t.Optional[str] = "00000001"
+        body: t.Optional[bytes] = None
+
+        password_hash: str = make_password_hash(realm, username, password)
+        response: str = calc_response(method, uri, password_hash, nonce, qop,
+                                      algorithm, cnonce, nc, body)
+        self.assertEqual(response, "6629fae49393a05397450978507c4ef1")