drain twice

Author: TingDaoK

tests/test_stream_manager.c

@@ -1444,6 +1444,9 @@ TEST_CASE(h2_sm_mock_max_concurrent_streams_multiple_connections) {
     ASSERT_SUCCESS(s_complete_all_fake_connection_streams());
     fprintf(stderr, "[EXTRA_LOG] Test completed successfully\n");
     s_drain_all_fake_connection_testing_channel();
+    /* completed the remain streams that can be created afterwards */
+    ASSERT_SUCCESS(s_complete_all_fake_connection_streams());
+    s_drain_all_fake_connection_testing_channel();
     /* Should complete without error */
     ASSERT_INT_EQUALS(0, s_tester.stream_complete_errors);
     ASSERT_INT_EQUALS(AWS_ERROR_SUCCESS, s_tester.stream_completed_error_code);