Experiment with vscode/test-cli package

.vscode-test.js

@@ -0,0 +1,12 @@
+const { defineConfig } = require('@vscode/test-cli');
+
+module.exports = defineConfig([
+  {
+    label: 'integration-tests',
+    files: 'out/test/**/*.test.js',
+    version: 'stable',
+    workspaceFolder: './test-workspace',
+    installExtensions: ['justusadam.language-haskell'],
+  }
+  // you can specify additional test configurations, too
+]);

package.json

@@ -1294,7 +1294,7 @@
     "push-tag": "git tag -a $npm_package_version -m \"Version $npm_package_version\" && git push origin $npm_package_version",
     "pretest": "tsc --alwaysStrict -p ./",
     "format": "prettier . --write",
-    "test": "node ./out/test/runTest.js"
+    "test": "vscode-test"
   },
   "husky": {
     "hooks": {
@@ -1309,6 +1309,7 @@
     "@types/which": "^3.0.4",
     "@typescript-eslint/eslint-plugin": "^7.18.0",
     "@typescript-eslint/parser": "^7.18.0",
+    "@vscode/test-cli": "^0.0.10",
     "@vscode/test-electron": "^2.4.1",
     "eslint": "^8.57.0",
     "eslint-webpack-plugin": "^4.2.0",