'Pytest passes when run in debug mode but fails otherwise

Following is the pytest code that I execute to test the add connection command.

 def test_cli_connection_add(self, cmd, expected_output, expected_conn):
        runner = CliRunner()
        result = runner.invoke(connections, cmd)
        assert result.output.strip() == expected_output

It fails with issue that tells the expected output should have newline.

>       assert result.output.strip() == expected_output
E       AssertionError: assert ('Successfully added `conn_id`=new4 : '\n 'hive_metastore://airflow:******@host:9083/airflow') == ('Successfully added `conn_id`=new4 :   \n'\n 'hive_metastore://airflow:******@host:9083/airflow')
E         + Successfully added `conn_id`=new4 : hive_metastore://airflow:******@host:9083/airflow
E         - Successfully added `conn_id`=new4 :
E         - hive_metastore://airflow:******@host:9083/airflow

tests/cli/commands/test_connection.py:558: AssertionError

To debug this issue further I added set_trace in the code:

 def test_cli_connection_add(self, cmd, expected_output, expected_conn):
        pytest.set_trace()
        runner = CliRunner()
        result = runner.invoke(connections, cmd)
        assert result.output.strip() == expected_output

When I execute the code via debugger, the assertion pass. Can anyone help me why this works this way?

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'Pytest passes when run in debug mode but fails otherwise

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