def test_view_of_view_modification():
    adata = ad.AnnData(np.zeros((10, 10)))
    adata[0, :][:, 5:].X = np.ones(5)
    assert np.all(adata.X[0, 5:] == np.ones(5))
    adata[[1, 2], :][:, [1, 2]].X = np.ones((2, 2))
    assert np.all(adata.X[1:3, 1:3] == np.ones((2, 2)))

    adata.X = sparse.csr_matrix(adata.X)
    adata[0, :][:, 5:].X = np.ones(5) * 2
    assert np.all(asarray(adata.X)[0, 5:] == np.ones(5) * 2)
    adata[[1, 2], :][:, [1, 2]].X = np.ones((2, 2)) * 2
    assert np.all(asarray(adata.X)[1:3, 1:3] == np.ones((2, 2)) * 2)
def wait_for_snapshot_status(self, snapshot_id, status):
        """Waits for a Snapshot to reach a given status."""
        start_time = time.time()
        old_value = value = self._get_snapshot_status(snapshot_id)
        while True:
            dtime = time.time() - start_time
            time.sleep(self.build_interval)
            if value != old_value:
                LOG.info('Value transition from "%s" to "%s"'
                         'in %d second(s).', old_value,
                         value, dtime)
            if (value == status):
                return value

            if dtime > self.build_timeout:
                message = ('Time Limit Exceeded! (%ds)'
                           'while waiting for %s, '
                           'but we got %s.' %
                           (self.build_timeout, status, value))
                raise exceptions.TimeoutException(message)
            time.sleep(self.build_interval)
            old_value = value
            value = self._get_snapshot_status(snapshot_id)