Method addData

src/cdk/tree/tree-with-tree-control.spec.ts:1335–1344

(level: number = 1)

  }

  addData(level: number = 1) {
    const nextIndex = ++this.dataIndex;

    let copiedData = this.data.slice();
    copiedData.push(
      new TestData(`topping_${nextIndex}`, `cheese_${nextIndex}`, `base_${nextIndex}`, level),
    );

    this.data = copiedData;
  }
}

function getNodes(treeElement: Element): HTMLElement[] {