Enable concurrent vitest execution (#36998)

Enable
[`sequence.concurrent`](https://vitest.dev/config/sequence.html#sequence-concurrent)
to run all js tests in parallel. This will help catch potential
concurrency bugs in the future. The "Repository Branch Settings" test
was not concurrency-safe, it was refactored to remove shared mutable
state.

Co-Authored-By: Claude (claude-opus-4-6) <noreply@anthropic.com>

---------

Co-authored-by: Claude (claude-opus-4-6) <noreply@anthropic.com>

vitest.config.ts

@@ -14,6 +14,9 @@ export default defineConfig({
     globals: true,
     watch: false,
     isolate: false,
+    sequence: {
+      concurrent: true,
+    },
   },
   plugins: [
     stringPlugin(),

web_src/js/features/repo-settings-branches.test.ts

@@ -1,8 +1,7 @@
 import {initRepoSettingsBranchesDrag} from './repo-settings-branches.ts';
 import {POST} from '../modules/fetch.ts';
 import {createSortable} from '../modules/sortable.ts';
-import type {SortableEvent, SortableOptions} from 'sortablejs';
+import type {SortableEvent} from 'sortablejs';
-import type Sortable from 'sortablejs';
 
 vi.mock('../modules/fetch.ts', () => ({
   POST: vi.fn(),
@@ -12,63 +11,48 @@ vi.mock('../modules/sortable.ts', () => ({
   createSortable: vi.fn(),
 }));
 
+const branchesHTML = `
+  <div id="protected-branches-list" data-update-priority-url="some/repo/branches/priority">
+    <div class="flex-item tw-items-center item" data-id="1">
+      <div class="drag-handle"></div>
+    </div>
+    <div class="flex-item tw-items-center item" data-id="2">
+      <div class="drag-handle"></div>
+    </div>
+    <div class="flex-item tw-items-center item" data-id="3">
+      <div class="drag-handle"></div>
+    </div>
+  </div>
+`;
+
 describe('Repository Branch Settings', () => {
-  beforeEach(() => {
-    document.body.innerHTML = `
-      <div id="protected-branches-list" data-update-priority-url="some/repo/branches/priority">
-        <div class="flex-item tw-items-center item" data-id="1" >
-          <div class="drag-handle"></div>
-        </div>
-        <div class="flex-item tw-items-center item" data-id="2" >
-          <div class="drag-handle"></div>
-        </div>
-        <div class="flex-item tw-items-center item" data-id="3" >
-          <div class="drag-handle"></div>
-        </div>
-      </div>
-    `;
-
-    vi.clearAllMocks();
-  });
-
   test('should initialize sortable for protected branches list', () => {
+    document.body.innerHTML = branchesHTML;
+    const callsBefore = vi.mocked(createSortable).mock.calls.length;
     initRepoSettingsBranchesDrag();
-
+    const newCalls = vi.mocked(createSortable).mock.calls.slice(callsBefore);
-    expect(createSortable).toHaveBeenCalledWith(
+    expect(newCalls).toHaveLength(1);
-      document.querySelector('#protected-branches-list'),
+    expect(newCalls[0][0]).toBe(document.querySelector('#protected-branches-list'));
-      expect.objectContaining({
+    expect(newCalls[0][1]).toMatchObject({handle: '.drag-handle', animation: 150});
-        handle: '.drag-handle',
-        animation: 150,
-      }),
-    );
   });
 
   test('should not initialize if protected branches list is not present', () => {
-    document.body.innerHTML = '';
+    document.querySelector('#protected-branches-list')?.remove();
-
+    const callsBefore = vi.mocked(createSortable).mock.calls.length;
     initRepoSettingsBranchesDrag();
-
+    expect(vi.mocked(createSortable).mock.calls.length).toBe(callsBefore);
-    expect(createSortable).not.toHaveBeenCalled();
   });
 
-  test('should post new order after sorting', async () => {
+  test('should post new order after sorting', () => {
+    document.body.innerHTML = branchesHTML;
     vi.mocked(POST).mockResolvedValue({ok: true} as Response);
-
+    const callsBefore = vi.mocked(createSortable).mock.calls.length;
-    // Mock createSortable to capture and execute the onEnd callback
-    vi.mocked(createSortable).mockImplementation(async (_el: HTMLElement, options: SortableOptions | undefined) => {
-      if (options?.onEnd) {
-        options.onEnd(new Event('SortableEvent') as SortableEvent);
-      }
-      return {destroy: vi.fn()} as unknown as Sortable;
-    });
-
     initRepoSettingsBranchesDrag();
-
+    const onEnd = vi.mocked(createSortable).mock.calls[callsBefore][1]!.onEnd!;
+    onEnd(new Event('SortableEvent') as SortableEvent);
     expect(POST).toHaveBeenCalledWith(
       'some/repo/branches/priority',
-      expect.objectContaining({
+      expect.objectContaining({data: {ids: [1, 2, 3]}}),
-        data: {ids: [1, 2, 3]},
-      }),
     );
   });
 });

web_src/js/markup/render-iframe.test.ts

@@ -28,6 +28,7 @@ describe('navigateToIframeLink', () => {
   });
 
   test('unsafe links', () => {
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => undefined);
     window.location.href = 'http://localhost:3000/';
 
     // eslint-disable-next-line no-script-url
@@ -41,6 +42,7 @@ describe('navigateToIframeLink', () => {
     expect(openSpy).toHaveBeenCalledTimes(0);
     expect(assignSpy).toHaveBeenCalledTimes(0);
     expect(window.location.href).toBe('http://localhost:3000/');
+    errorSpy.mockRestore();
     vi.clearAllMocks();
   });
 });