def test_exec_command_failure__expect_error(self):
        """
        Test exec_command for command execution failure.
        """
        cmd = "nonexistent_command"

        exit_status, result, error = self.operations.exec_command(cmd, verbose=True, wait_exit=True, shell=True, expect_error=True)

        assert error == b'bash: line 1: nonexistent_command: command not found\n'
        assert exit_status == 127
        assert result == b''