Update test calling count measurement

- comment @varmar05

Author: MarcelGeo

mergin/client.py

@@ -1538,3 +1538,5 @@ def sync_project(self, project_directory, progress_callback=None):
                     sleep(PUSH_ATTEMPT_WAIT)
                     continue
                 raise e
+            else:
+                server_conflict_attempts = 0

mergin/common.py

@@ -83,6 +83,7 @@ def is_retryable_sync(self) -> bool:
         if self.is_blocking_sync() or self.is_rate_limit():
             return True
 
+        # Check retryable based on http error and message from v1 sync API endpoint
         if (
             self.http_error
             and self.detail

mergin/test/test_client.py

@@ -3172,6 +3172,7 @@ def test_client_project_sync_retry(mc):
         mock_push_project_finalize.side_effect = ClientError("test error")
         with pytest.raises(ClientError, match="test error"):
             mc.sync_project(project_dir)
+        assert mock_push_project_finalize.call_count == 1
 
     with patch("mergin.client.push_project_finalize") as mock_push_project_finalize, patch(
         "mergin.client.PUSH_ATTEMPTS", 2