angular/components

bug(MatTree): MatTreeHarness with NestedTreeControl returns wrong structure

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#23,881 建立於 2021年11月3日

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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

貢獻者指南

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.
技術棧
typescriptangularhtml
領域
frontendtesting
議題類型
錯誤
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 小時
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
較久未更新
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
清晰
前置要求
Angular MaterialComponent test harnessesMatTree
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
30