fixup! Rewrite test codes to replace httpretty with responses

Author: yuokada

tests/unit/test_client.py

@@ -551,13 +551,12 @@ def test_oauth2_header_parsing(header, sample_post_response_data):
     token_server = f"{TOKEN_RESOURCE}/{challenge_id}"
 
     # noinspection PyUnusedLocal
-    # def post_statement(request, uri, response_headers):  # FIXME
-    def post_statement(request):
+    def post_statement(request, uri, response_headers):
         authorization = request.headers.get("Authorization")
         if authorization and authorization.replace("Bearer ", "") in token:
-            return (200, {}, json.dumps(sample_post_response_data))
-        return (401, {'Www-Authenticate': header.format(redirect_server=redirect_server, token_server=token_server),
-                      'Basic realm': '"Trino"'}, "")
+            return [200, response_headers, json.dumps(sample_post_response_data)]
+        return [401, {'Www-Authenticate': header.format(redirect_server=redirect_server, token_server=token_server),
+                      'Basic realm': '"Trino"'}, ""]
 
     # bind post statement
     responses.add_callback(