feat: vscode extension setup

src/test/extension.test.ts

@@ -0,0 +1,11 @@
+import * as assert from "assert";
+import * as vscode from "vscode";
+
+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));
+	});
+});