feat: final bug fixes

src/seqta/utils/waitForSeqtaShell.test.ts

@@ -0,0 +1,48 @@
+/**
+ * @jest-environment jsdom
+ */
+import { waitForElm } from "@/seqta/utils/waitForElm";
+import {
+  resetSeqtaShellWaiters,
+  waitForSeqtaMenu,
+  waitForSeqtaTitle,
+} from "./waitForSeqtaShell";
+
+jest.mock("@/seqta/utils/waitForElm", () => ({
+  waitForElm: jest.fn(),
+}));
+
+describe("waitForSeqtaShell", () => {
+  beforeEach(() => {
+    resetSeqtaShellWaiters();
+    document.body.innerHTML = "";
+    jest.mocked(waitForElm).mockReset();
+  });
+
+  it("returns existing #title without calling waitForElm", async () => {
+    const el = document.createElement("div");
+    el.id = "title";
+    document.body.append(el);
+
+    await expect(waitForSeqtaTitle()).resolves.toBe(el);
+    expect(waitForElm).not.toHaveBeenCalled();
+  });
+
+  it("shares one waitForElm promise for concurrent #menu waiters", async () => {
+    let resolveWait!: (el: Element) => void;
+    const pending = new Promise<Element>((resolve) => {
+      resolveWait = resolve;
+    });
+    jest.mocked(waitForElm).mockReturnValue(pending);
+
+    const a = waitForSeqtaMenu();
+    const b = waitForSeqtaMenu();
+    expect(waitForElm).toHaveBeenCalledTimes(1);
+
+    const menu = document.createElement("div");
+    menu.id = "menu";
+    resolveWait(menu);
+
+    await expect(Promise.all([a, b])).resolves.toEqual([menu, menu]);
+  });
+});