Ensure that we do not cache empty sync responses after a timeout (#10158)

Fixes #8518 by telling the ResponseCache not to cache the /sync response if the next_batch param is the same as the since token.

1 files changed, 3 insertions, 5 deletions

diff --git a/tests/server.py b/tests/server.py
index 9df8cda24f..f32d8dc375 100644
--- a/tests/server.py
+++ b/tests/server.py
@@ -138,21 +138,19 @@ class FakeChannel:
     def transport(self):
         return self
 
-    def await_result(self, timeout: int = 100) -> None:
+    def await_result(self, timeout_ms: int = 1000) -> None:
         """
         Wait until the request is finished.
         """
+        end_time = self._reactor.seconds() + timeout_ms / 1000.0
         self._reactor.run()
-        x = 0
 
         while not self.is_finished():
             # If there's a producer, tell it to resume producing so we get content
             if self._producer:
                 self._producer.resumeProducing()
 
-            x += 1
-
-            if x > timeout:
+            if self._reactor.seconds() > end_time:
                 raise TimedOutException("Timed out waiting for request to finish.")
 
             self._reactor.advance(0.1)