chore: initial extension setup

test/extension.test.js

@@ -0,0 +1,15 @@
+const assert = require('assert');
+
+// You can import and use all API from the 'vscode' module
+// as well as import your extension to test it
+const vscode = require('vscode');
+// const myExtension = require('../extension');
+
+suite('Extension Test Suite', () => {
+	vscode.window.showInformationMessage('Start all tests.');
+
+	test('Sample test', () => {
+		assert.strictEqual(-1, [1, 2, 3].indexOf(5));
+		assert.strictEqual(-1, [1, 2, 3].indexOf(0));
+	});
+});