Make VS Code test windows invisible on macOS

- Add scripts/hide-test-vscode.sh: patches downloaded test VS Code
  bundles with LSUIElement=true so they run as background apps (no
  Dock icon, no Cmd+Tab, no focus stealing)
- Wire the patch into test:extension and test:all npm scripts
- Add --disable-gpu and --disable-gpu-sandbox to runExtensionTests.ts
- npm run check remains unchanged (unit tests only, no VS Code)

Signed-off-by: Sebastien Tardif <sebtardif@ncf.ca>

Author: SebTardif

package.json

@@ -109,10 +109,10 @@
     "compile-uitests": "tsc -p ./tsconfig.uitest.json",
     "watch": "tsc -watch -p ./",
     "test:unit": "node --test ./out-test/test/unit/*.test.js",
-    "test:extension": "node ./out-test/test/suite/runExtensionTests.js",
+    "test:extension": "bash scripts/hide-test-vscode.sh && node ./out-test/test/suite/runExtensionTests.js",
     "test:ui": "npm run compile && npm run compile-uitests && extest setup-and-run './out-uitest/test/ui/*.test.js' --code_version max --extensions_dir .vscode-test/extensions",
     "test": "npm run compile && npm run compile-tests && npm run test:unit",
-    "test:all": "npm run compile && npm run compile-tests && npm run test:unit && npm run test:extension",
+    "test:all": "npm run compile && npm run compile-tests && bash scripts/hide-test-vscode.sh && npm run test:unit && npm run test:extension",
     "vscode:prepublish": "npm run compile",
     "package": "vsce package",
     "check": "npm run test && npm run package"

scripts/hide-test-vscode.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+# Patch all downloaded test VS Code .app bundles on macOS to run as
+# background apps (no Dock icon, no Cmd+Tab, no focus stealing).
+# Safe to run multiple times; skips already-patched bundles.
+# No-op on Linux/Windows.
+
+set -euo pipefail
+
+if [[ "$(uname -s)" != "Darwin" ]]; then
+  exit 0
+fi
+
+patched=0
+shopt -s nullglob
+
+for plist in \
+  .vscode-test/*/Visual\ Studio\ Code*.app/Contents/Info.plist; do
+  [ -f "$plist" ] || continue
+
+  if plutil -extract LSUIElement raw "$plist" >/dev/null 2>&1; then
+    continue
+  fi
+
+  plutil -insert LSUIElement -bool true "$plist"
+  patched=$((patched + 1))
+  echo "Patched: $plist"
+done
+
+if [[ $patched -eq 0 ]]; then
+  echo "No test VS Code bundles to patch"
+fi

test/suite/runExtensionTests.ts

@@ -8,7 +8,11 @@ async function main(): Promise<void> {
   await runTests({
     extensionDevelopmentPath,
     extensionTestsPath,
-    launchArgs: [extensionDevelopmentPath]
+    launchArgs: [
+      extensionDevelopmentPath,
+      "--disable-gpu",
+      "--disable-gpu-sandbox"
+    ]
   });
 }