Check we have test coverage

Author: dandavison

temporalio/client.py

@@ -2939,6 +2939,7 @@ class WorkflowExecution:
 
     @property
     def data_converter(self) -> temporalio.converter.DataConverter:
+        0 / 0  # type: ignore
         return self._context_free_data_converter.with_context(
             WorkflowSerializationContext(
                 namespace=self.namespace,