def test_view_of_view(matrix_type, subset_func, subset_func2):
    adata = gen_adata((30, 15), X_type=matrix_type)
    adata.raw = adata
    if subset_func is single_subset:
        pytest.xfail("Other subset generating functions have trouble with this")
    var_s1 = subset_func(adata.var_names, min_size=4)
    var_view1 = adata[:, var_s1]
    var_s2 = subset_func2(var_view1.var_names)
    var_view2 = var_view1[:, var_s2]
    assert var_view2._adata_ref is adata
    obs_s1 = subset_func(adata.obs_names, min_size=4)
    obs_view1 = adata[obs_s1, :]
    obs_s2 = subset_func2(obs_view1.obs_names)
    assert adata[obs_s1, :][:, var_s1][obs_s2, :]._adata_ref is adata

    view_of_actual_copy = adata[:, var_s1].copy()[obs_s1, :].copy()[:, var_s2].copy()

    view_of_view_copy = adata[:, var_s1][obs_s1, :][:, var_s2].copy()

    assert_equal(view_of_actual_copy, view_of_view_copy, exact=True)
def test_get_volume_attachment(self):
        """Test getting volume attachments

        Attach a volume to a server, and then retrieve volume's attachments
        info.
        """
        # Create a server
        server = self.create_server()
        # Verify that a volume's attachment information is retrieved
        self.volumes_client.attach_volume(self.volume['id'],
                                          instance_uuid=server['id'],
                                          mountpoint='/dev/%s' %
                                          CONF.compute.volume_device_name)
        waiters.wait_for_volume_resource_status(self.volumes_client,
                                                self.volume['id'],
                                                'in-use')
        self.addCleanup(waiters.wait_for_volume_resource_status,
                        self.volumes_client,
                        self.volume['id'], 'available')
        self.addCleanup(self.volumes_client.detach_volume, self.volume['id'])
        volume = self.volumes_client.show_volume(self.volume['id'])['volume']
        attachment = volume['attachments'][0]

        self.assertEqual('/dev/%s' %
                         CONF.compute.volume_device_name,
                         attachment['device'])
        self.assertEqual(server['id'], attachment['server_id'])
        self.assertEqual(self.volume['id'], attachment['id'])
        self.assertEqual(self.volume['id'], attachment['volume_id'])