def adata():
    adata = ad.AnnData(np.zeros((100, 100)))
    adata.obsm["o"] = np.zeros((100, 50))
    adata.varm["o"] = np.zeros((100, 50))
    return adata
def test_disk_usage_sensor_is_stateless():
    sensor = disk_usage.DiskUsage()
    ok_([] != sensor.measure())