def METHOD_NAME(self):
    """Test an input file containing a single sequence."""
    input_file = "Fasta/f001"
    self.assertTrue(os.path.isfile(input_file))
    self.assertEqual(len(list(SeqIO.parse(input_file, "fasta"))), 1)
    cline = MSAProbsCommandline(msaprobs_exe, infile=input_file)
    try:
        stdout, stderr = cline()
    except ApplicationError as err:
        if sys.platform == "win32":
            expected = 0xC0000005
        elif sys.platform == "darwin":
            expected = -11
        else:
            expected = 139  # TODO: Check return codes on various other platforms
        self.assertEqual(expected, err.returncode)
    else:
        self.fail(f"Should have failed, returned:\n{stdout}\n{stderr}")