def test_layers_view():
    X = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
    L = np.array([[10, 11, 12], [13, 14, 15], [16, 17, 18]])
    real_adata = ad.AnnData(X)
    real_adata.layers["L"] = L
    view_adata = real_adata[1:, 1:]
    real_hash = joblib.hash(real_adata)
    view_hash = joblib.hash(view_adata)

    assert view_adata.is_view

    with pytest.raises(ValueError):
        view_adata.layers["L2"] = L + 2

    assert view_adata.is_view  # Failing to set layer item makes adata not view
    assert real_hash == joblib.hash(real_adata)
    assert view_hash == joblib.hash(view_adata)

    view_adata.layers["L2"] = L[1:, 1:] + 2

    assert not view_adata.is_view
    assert real_hash == joblib.hash(real_adata)
    assert view_hash != joblib.hash(view_adata)
def prepare_request(next_link=None):
            # Construct headers
            header_parameters = {}  # type: Dict[str, Any]
            header_parameters['Accept'] = self._serialize.header("accept", accept, 'str')

            if not next_link:
                # Construct URL
                url = self.list_query_results_for_management_group.metadata['url']  # type: ignore
                path_format_arguments = {
                    'managementGroupsNamespace': self._serialize.url("management_groups_namespace", management_groups_namespace, 'str'),
                    'managementGroupName': self._serialize.url("management_group_name", management_group_name, 'str'),
                    'policyTrackedResourcesResource': self._serialize.url("policy_tracked_resources_resource", policy_tracked_resources_resource, 'str'),
                }
                url = self._client.format_url(url, **path_format_arguments)
                # Construct parameters
                query_parameters = {}  # type: Dict[str, Any]
                if _top is not None:
                    query_parameters['$top'] = self._serialize.query("top", _top, 'int', minimum=0)
                if _filter is not None:
                    query_parameters['$filter'] = self._serialize.query("filter", _filter, 'str')
                query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')

                request = self._client.post(url, query_parameters, header_parameters)
            else:
                url = next_link
                query_parameters = {}  # type: Dict[str, Any]
                request = self._client.get(url, query_parameters, header_parameters)
            return request