Fix tests that failed in environments where XDG_DATA_HOME is set

[mizdra]

close: #285400

$ export XDG_DATA_HOME="/Users/mizdra/.local/share"; ./scripts/test.sh --run 'vs/workbench/contrib/terminalContrib/history/test/common/history.test.js' --grep fetchFishHistory

> [email protected] electron
> node build/lib/electron.ts

Found --crash-reporter-directory argument. Setting crashDumps directory to be '/Users/mizdra/src/github.com/microsoft/vscode/.build/crashes'
[29260:1230/171826.353523:INFO:CONSOLE:2] "The vm module of Node.js is unsupported in Electron's renderer process due to incompatibilities with the Blink rendering engine. Crashes are likely and avoiding the module is highly recommended. This module may be removed in a future release.", source: node:electron/js2c/renderer_init (2)
[29260:1230/171826.488522:INFO:CONSOLE:2] "Platform browser has already been set. Overwriting the platform with [object Object].", source: /Users/mizdra/src/github.com/microsoft/vscode/node_modules/@vscode/vscode-languagedetection/dist/lib/index.js (2)
(node:29265) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `Code - OSS Helper (Renderer) --trace-deprecation ...` to show where the warning was created)
(node:29265) [DEP0025] DeprecationWarning: sys is deprecated. Use util instead.
(node:29265) ExperimentalWarning: WASI is an experimental feature and might change at any time


  Terminal history
    fetchFishHistory
      local
        ✔ current OS
      local (overriden path)
        ✔ current OS
      remote
        ✔ Windows
        ✔ macOS
        ✔ Linux
      remote (overriden path)
        ✔ Windows
        ✔ macOS
        ✔ Linux
      sanitizeFishHistoryCmd
        ✔ valid new-lines
        ✔ invalid new-lines


  10 passing (6ms)

[mizdra]

@microsoft-github-policy-service agree

[Copilot]

Pull request overview

This PR fixes test failures that occurred when the XDG_DATA_HOME environment variable is set on the system. The tests were previously only handling the HOME environment variable but not XDG_DATA_HOME, which affected the Fish shell history path resolution in certain environments.

Key Changes:

• Updated test setup/teardown to preserve and restore XDG_DATA_HOME environment variable
• Added explicit deletion of XDG_DATA_HOME in test setup to ensure clean test state