Similar to syncgateway.py, created a replication url for CBL DBs (#179)

Author: vipbhardwaj

client/src/cbltest/api/testserver.py

@@ -1,8 +1,10 @@
 from typing import cast
+from urllib.parse import urljoin
 
 from opentelemetry.trace import get_tracer
 
 from cbltest.api.database import Database
+from cbltest.assertions import _assert_not_null
 from cbltest.globals import CBLPyTestGlobal
 from cbltest.requests import RequestFactory, TestServerRequestType
 from cbltest.responses import GetRootResponse
@@ -117,3 +119,13 @@ async def log(self, msg: str) -> None:
             TestServerRequestType.LOG, payload
         )
         await self.__request_factory.send_request(self.__index, request)
+
+    def replication_url(self, db_name: str, port: int):
+        """
+        Returns the URL of the replication endpoint for this test server
+        """
+        ws_scheme = "ws://"  # For now not using secure
+
+        _assert_not_null(db_name, "db_name")
+        replication_url = f"{ws_scheme}{self.url}:{port}"
+        return urljoin(replication_url, db_name)