angular-docs-cn/modules/@angular/router/test/utils/tree.spec.ts

import {Tree, TreeNode} from '../../src/utils/tree';

describe('tree', () => {
  it("should return the root of the tree", () => {
    const t = new Tree<any>(new TreeNode<number>(1, []));
    expect(t.root).toEqual(1);
  });

  it("should return the parent of a node", () => {
    const t = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(2, [])]));
    expect(t.parent(1)).toEqual(null);
    expect(t.parent(2)).toEqual(1);
  });

  it("should return the children of a node", () => {
    const t = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(2, [])]));
    expect(t.children(1)).toEqual([2]);
    expect(t.children(2)).toEqual([]);
  });

  it("should return the first child of a node", () => {
    const t = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(2, [])]));
    expect(t.firstChild(1)).toEqual(2);
    expect(t.firstChild(2)).toEqual(null);
  });

  it("should return the siblings of a node", () => {
    const t = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(2, []), new TreeNode<number>(3, [])]));
    expect(t.siblings(2)).toEqual([3]);
    expect(t.siblings(1)).toEqual([]);
  });

  it("should return the path to the root", () => {
    const t = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(2, [])]));
    expect(t.pathFromRoot(2)).toEqual([1, 2]);
  });

  describe("contains", () => {
    it("should work", () => {
      const tree = new Tree<any>(
        new TreeNode<number>(1, [new TreeNode<number>(2, []), new TreeNode<number>(3, [])]));
      const subtree1 = new Tree<any>(new TreeNode<number>(1, []));
      const subtree2 = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(2, [])]));
      const subtree3 = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(3, [])]));
      const notSubtree1 = new Tree<any>(new TreeNode<number>(1, [new TreeNode<number>(4, [])]));
      const notSubtree2 = new Tree<any>(
        new TreeNode<number>(1, [new TreeNode<number>(2, [new TreeNode<number>(4, [])])]));

      expect(tree.contains(subtree1)).toEqual(true);
      expect(tree.contains(subtree2)).toEqual(true);
      expect(tree.contains(subtree3)).toEqual(true);
      expect(tree.contains(notSubtree1)).toEqual(false);
      expect(tree.contains(notSubtree2)).toEqual(false);
    });
  });
});