Function mutateData

src/cdk/tree/tree-with-tree-control.spec.ts:513–526

()

      }

      function mutateData() {
        // Swap first and second data in data array
        const copiedData = component.dataSource.data.slice();
        const temp = copiedData[0];
        copiedData[0] = copiedData[1];
        copiedData[1] = temp;

        // Remove the third element
        copiedData.splice(2, 1);

        // Add new data
        component.dataSource.data = copiedData;
        component.dataSource.addData();
      }

      it('should add/remove/move nodes with reference-based trackBy', () => {
        createTrackByTestComponent('reference');