def METHOD_NAME():
    du = DiskUsage(context_wrap(DU_VAR_LIB))
    assert len(du) == 1
    assert '/var/lib/pgsql' in du
    assert du.get('/var/lib/pgsql') == 186724
    assert '/var/some/fake' not in du
    assert du.get('/Fake') is None
    assert du == {'/var/lib/pgsql': 186724}
    du = DiskUsage(context_wrap(DU_VAR_LIB_STAR))
    assert len(du) == 10
    assert '/var/lib/rpm' in du
    assert du.get('/var/lib/rpm') == 110712
    assert du == {'/var/lib/alternatives': 56, '/var/lib/logrotate': 4, '/var/lib/mlocate': 5492, '/var/lib/NetworkManager': 20, '/var/lib/pgsql': 186484, '/var/lib/rhsm': 856, '/var/lib/rpm': 110712, '/var/lib/rsyslog': 4, '/var/lib/systemd': 64, '/var/lib/yum': 15200}
    du = DiskUsage(context_wrap(DU_ACCESS_ERROR_OKAY))
    assert len(du) == 1
    assert '/' in du
    assert du.get('/') == 5904560
    du = DiskUsage(context_wrap(DU_SPACES))
    assert du.get('/mnt/abc xyz') == 102400
    assert du == {'/mnt/abc xyz': 102400}
    du = DiskUsage(context_wrap(DU_4K_VAR_LOG))
    assert len(du) == 4
    assert '/var/log/httpd' in du
    assert du.get('/var/log/httpd') == 85