fix(settings): confirm destructive defaults reset

tests/helpers/extension-test-utils.js

@@ -42,6 +42,7 @@ function applyJSDOMWindow(win) {
   win.Date = globalThis.Date;
   win.open = vi.fn();
   win.close = vi.fn();
+  win.confirm = vi.fn(() => true);
 }
 
 function loadHtmlString(html, options) {

tests/helpers/jsdom-globals.js

@@ -27,4 +27,5 @@ export function applyJSDOMWindow(win) {
 
   win.open = vi.fn();
   win.close = vi.fn();
+  win.confirm = vi.fn(() => true);
 }

tests/options.integration.test.js

@@ -390,4 +390,22 @@ describe("options page", () => {
     ).toEqual(expect.any(Number));
     expect(chrome.storage.local.__state.unrelatedLocalValue).toBe("keep");
   });
+
+  it("leaves settings untouched when restoring defaults is cancelled", async () => {
+    const chrome = await setupOptions({ sync: { rememberSpeed: true } });
+    window.confirm.mockReturnValueOnce(false);
+    chrome.storage.sync.set.mockClear();
+    chrome.storage.sync.remove.mockClear();
+    chrome.storage.local.set.mockClear();
+    chrome.storage.local.remove.mockClear();
+
+    globalThis.restore_defaults();
+
+    expect(window.confirm).toHaveBeenCalledOnce();
+    expect(chrome.storage.sync.set).not.toHaveBeenCalled();
+    expect(chrome.storage.sync.remove).not.toHaveBeenCalled();
+    expect(chrome.storage.local.set).not.toHaveBeenCalled();
+    expect(chrome.storage.local.remove).not.toHaveBeenCalled();
+    expect(chrome.storage.sync.__state.rememberSpeed).toBe(true);
+  });
 });