def METHOD_NAME(self):
    s = file_finder.SubjectFiles(subpath=os.path.join('path', 'to', 'm2m_sub'))
    assert s.subpath == os.path.join('path', 'to', 'm2m_sub')
    assert s.subid == 'sub'
    assert s.fnamehead == os.path.join('path', 'to', 'm2m_sub', 'sub.msh')