Add translations and testing framework.

src/main/index.test.ts

@@ -0,0 +1,21 @@
+import { _electron as electron } from "playwright";
+import { test, expect } from "@playwright/test";
+
+test("example test", async () => {
+  const electronApp = await electron.launch({ args: ["."] });
+  const isPackaged = await electronApp.evaluate(async ({ app }) => {
+    // This runs in Electron's main process, parameter here is always
+    // the result of the require('electron') in the main app script.
+    return app.isPackaged;
+  });
+
+  expect(isPackaged).toBe(false);
+
+  // Wait for the first BrowserWindow to open
+  // and return its Page object
+  const window = await electronApp.firstWindow();
+  await window.screenshot({ path: "intro.png" });
+
+  // close app
+  await electronApp.close();
+});