// Copyright (c) Meta Platforms, Inc. and affiliates. import {describe, it, expect, afterEach} from 'vitest'; import {isFocusDetached} from './focusReturn'; describe('isFocusDetached', () => { afterEach(() => { document.body.innerHTML = ''; }); it('is true when focus rests on the body (Escape / empty-space dismiss)', () => { // Nothing focused → activeElement is . (document.activeElement as HTMLElement | null)?.blur(); expect(isFocusDetached()).toBe(true); }); it('is false when a real element holds focus (the user moved focus there)', () => { const input = document.createElement('input'); document.body.appendChild(input); input.focus(); expect(document.activeElement).toBe(input); expect(isFocusDetached()).toBe(false); }); it('treats the documentElement as detached', () => { const doc = { activeElement: document.documentElement, body: document.body, documentElement: document.documentElement, } as unknown as Document; expect(isFocusDetached(doc)).toBe(true); }); it('treats a null activeElement as detached', () => { const doc = { activeElement: null, body: document.body, documentElement: document.documentElement, } as unknown as Document; expect(isFocusDetached(doc)).toBe(true); }); });