fix(ci): restore the custom test runner

.vscodeignore

@@ -15,7 +15,6 @@ demo/**
 .eslintignore
 .eslintrc.json
 eslint.config.js
-.vscode-test.mjs
 .gitattributes
 .gitignore
 .gitignore-revs

CHANGELOG.md

@@ -11,8 +11,7 @@
 ### Maintenance
 
 -   Updated CI to Node.js 24 and current Node.js 24-based GitHub Actions.
--   Migrated extension tests to the current VS Code test CLI, including automatic installation of declared extension dependencies.
--   Updated the VS Code test runtime to support current macOS runners.
+-   Updated the VS Code Electron test harness for current CI runners without replacing the project's custom test entry point.
 -   Added weekly Dependabot updates for npm packages and GitHub Actions.
 
 ## [0.5.4] - 2025-12-23

eslint.config.js

@@ -24,6 +24,10 @@ module.exports = [
             "@typescript-eslint/no-require-imports": "off",
             "@typescript-eslint/no-inferrable-types": "off",
             "@typescript-eslint/no-empty-function": "off",
+            "@typescript-eslint/no-unused-vars": [
+                "error",
+                { caughtErrors: "none" },
+            ],
         },
     },
 ];

package.json

@@ -73,7 +73,7 @@
 		"lint": "eslint src",
 		"watch": "tsc -watch -p ./",
 		"pretest": "yarn compile",
-		"test": "vscode-test"
+		"test": "node ./out/test/runTest.js"
 	},
 	"devDependencies": {
 		"@eslint/js": "^10.0.1",
@@ -82,9 +82,10 @@
 		"@types/vscode": "1.46.0",
 		"@typescript-eslint/eslint-plugin": "^8.68.0",
 		"@typescript-eslint/parser": "^8.68.0",
-		"@vscode/test-cli": "^0.0.15",
 		"@vscode/test-electron": "^3.1.0",
 		"eslint": "^10.9.1",
+		"glob": "^13.0.6",
+		"mocha": "^11.8.0",
 		"typescript": "^6.0.3"
 	},
 	"resolutions": {

src/test/node24-globals.d.ts

@@ -0,0 +1,12 @@
+/**
+ * The test launcher runs under CI's Node.js 24 runtime, while extension source
+ * is checked against the Node.js 12 runtime provided by the minimum VS Code
+ * version. Declare only the newer global required by the test launcher.
+ */
+interface TestRunnerFetchResponse {
+    readonly ok: boolean;
+    readonly status: number;
+    arrayBuffer(): Promise<ArrayBuffer>;
+}
+
+declare function fetch(input: string): Promise<TestRunnerFetchResponse>;

src/test/runTest.ts

@@ -0,0 +1,26 @@
+import * as path from "path";
+import { runTests } from "@vscode/test-electron";
+
+async function main() {
+    try {
+        // The folder containing the Extension Manifest package.json
+        // Passed to `--extensionDevelopmentPath`
+        const extensionDevelopmentPath = path.resolve(__dirname, "../../");
+
+        // The path to test runner
+        // Passed to --extensionTestsPath
+        const extensionTestsPath = path.resolve(__dirname, "./suite/index");
+
+        // Download VS Code, unzip it and run the integration test
+        await runTests({
+            extensionDevelopmentPath,
+            extensionTestsPath,
+            launchArgs: [extensionDevelopmentPath],
+        });
+    } catch (err) {
+        console.error("Failed to run tests");
+        process.exit(1);
+    }
+}
+
+main();

src/test/suite/index.ts

@@ -0,0 +1,30 @@
+import * as path from "path";
+import { glob } from "glob";
+import Mocha = require("mocha");
+
+export async function run(): Promise<void> {
+    const mocha = new Mocha({
+        ui: "tdd",
+        color: true,
+        timeout: 10_000,
+    });
+
+    const testsRoot = path.resolve(__dirname, "..");
+    const files = await glob("**/*.test.js", { cwd: testsRoot });
+
+    files.forEach((file) => mocha.addFile(path.resolve(testsRoot, file)));
+
+    return new Promise((resolve, reject) => {
+        try {
+            mocha.run((failures) => {
+                if (failures > 0) {
+                    reject(new Error(`${failures} tests failed.`));
+                } else {
+                    resolve();
+                }
+            });
+        } catch (err) {
+            reject(err);
+        }
+    });
+}