fix: GIT-1623: handle cookie duplication and serialization issue

Signed-off-by: Harsha Narayana <harsha2k4@gmail.com>

tests/test_asgi.py

@@ -229,3 +229,30 @@ async def test_request_class_custom():
 
     _, response = await app.asgi_client.get("/custom")
     assert response.body == b"MyCustomRequest"
+
+
+@pytest.mark.asyncio
+async def test_cookie_customization(app):
+    @app.get("/cookie")
+    def get_cookie(request):
+        response = text("There's a cookie up in this response")
+        response.cookies["test"] = "Cookie1"
+        response.cookies["test"]["httponly"] = True
+
+        response.cookies["c2"] = "Cookie2"
+        response.cookies["c2"]["httponly"] = False
+
+        return response
+
+    _, response = await app.asgi_client.get("/cookie")
+    cookie_map = {
+        "test": {"value": "Cookie1", "HttpOnly": True},
+        "c2": {"value": "Cookie2", "HttpOnly": False},
+    }
+
+    for k, v in (
+        response.cookies._cookies.get("mockserver.local").get("/").items()
+    ):
+        assert cookie_map.get(k).get("value") == v.value
+        if cookie_map.get(k).get("HttpOnly"):
+            assert "HttpOnly" in v._rest.keys()