filechooserは発火しないっぽい。仕様をファイル選択ではなくダウンロードに書き換えるのが良さそう？

tests/e2e/browser/音声書き出し.spec.ts

@@ -1,8 +1,20 @@
+import os from "node:os";
+import fs from "node:fs";
+import path from "node:path";
 import { test, expect } from "@playwright/test";
 
 import { gotoHome, navigateToMain } from "../navigators";
 import { getQuasarMenu } from "../locators";
 
+// 書き出し先用のディレクトリを作る
+let tempDir: string;
+test.beforeAll(async () => {
+  tempDir = fs.mkdtempSync(os.tmpdir() + "/");
+});
+test.afterAll(async () => {
+  fs.rmSync(tempDir, { recursive: true });
+});
+
 test.beforeEach(gotoHome);
 
 test.describe("音声書き出し", () => {
@@ -31,10 +43,12 @@ test.describe("音声書き出し", () => {
   });
 
   test("選択中の音声を書き出し", async ({ page }) => {
+    const fileChooserPromise = page.waitForEvent("filechooser");
+
     await page.getByRole("button", { name: "ファイル" }).click();
     await getQuasarMenu(page, "選択音声を書き出し").click();
 
-    // FileChooserでいけるかも
-    // https://playwright.dev/docs/api/class-filechooser
+    const fileChooser = await fileChooserPromise;
+    await fileChooser.setFiles(path.join(tempDir, "output.wav"));
   });
 });