Fix test race condition on port binding (#32140)

src/python/grpcio_tests/tests/unit/_reconnect_test.py

@@ -48,20 +48,20 @@ class ReconnectTest(unittest.TestCase):
             server = grpc.server(server_pool, (handler,), options=options)
             server.add_insecure_port(addr)
             server.start()
-        channel = grpc.insecure_channel(addr)
-        multi_callable = channel.unary_unary(_UNARY_UNARY)
-        self.assertEqual(_RESPONSE, multi_callable(_REQUEST))
-        server.stop(None)
-        # By default, the channel connectivity is checked every 5s
-        # GRPC_CLIENT_CHANNEL_BACKUP_POLL_INTERVAL_MS can be set to change
-        # this.
-        time.sleep(5.1)
-        server = grpc.server(server_pool, (handler,), options=options)
-        server.add_insecure_port(addr)
-        server.start()
-        self.assertEqual(_RESPONSE, multi_callable(_REQUEST))
-        server.stop(None)
-        channel.close()
+            channel = grpc.insecure_channel(addr)
+            multi_callable = channel.unary_unary(_UNARY_UNARY)
+            self.assertEqual(_RESPONSE, multi_callable(_REQUEST))
+            server.stop(None)
+            # By default, the channel connectivity is checked every 5s
+            # GRPC_CLIENT_CHANNEL_BACKUP_POLL_INTERVAL_MS can be set to change
+            # this.
+            time.sleep(5.1)
+            server = grpc.server(server_pool, (handler,), options=options)
+            server.add_insecure_port(addr)
+            server.start()
+            self.assertEqual(_RESPONSE, multi_callable(_REQUEST))
+            server.stop(None)
+            channel.close()
 
 
 if __name__ == '__main__':