def METHOD_NAME(self, m_isfile):
    """Test good entry."""
    m_isfile.return_value = True
    usb_ids_content = textwrap.dedent("""
        0042  ACME
        \t0042  Seafourium
    """)
    mopen = mock_open(read_data=usb_ids_content)
    with patch('builtins.open', mopen):
        ids = UsbIds()
        self.assertEqual(ids.decode_product(0x42, 0x42), 'ACME Seafourium')