angular/components

bug(MatTree): MatTreeHarness with NestedTreeControl returns wrong structure

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#23,881 创建于 2021年11月3日

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P3area: cdk/treehelp wanted

描述

Reproduction

Steps to reproduce:

  1. Create a MatTreeComponent with a NestedTreeControl and MatTreeNestedDatasource
  2. Test the component structure

https://stackblitz.com/edit/harness-issue-xgqlpl?file=src/app/tree-harness-example.spec.ts

Expected Behavior

The structure should have as many children (2 in the Stackblitz example) as visible Nodes.

{ children: [ { text: "Group 1"}, { text: "Group 2"} ] }

Actual Behavior

The structure has only one children without text.

{ children: [ { text: ""} ] }

Environment

  • Angular: 12.2.12
  • CDK/Material: 12.2.12
  • Browser(s): Test Environment
  • Operating System (e.g. Windows, macOS, Ubuntu): Windows

贡献者指南

技术栈
typescriptangularhtml
领域
frontendtesting
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-3 hours
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
Angular MaterialComponent test harnessesMatTree
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
30
研究方向
Examine the MatTreeHarness class and its getStructure method in the Angular Material source code. The reproduction demonstrates that for a NestedTreeControl, the structure only returns one child with empty text. Compare the implementation for NestedTreeControl versus FlatTreeControl. The fix likely involves correctly traversing the tree nodes using the control's expand and children accessors. Refer to the Stackblitz for exact setup.