zhangxiang
7c0af54897
- Increase use-focus-trap mutation score from 42.62% to 85.25% (exceeds 50% target) - Add 40 new test cases: focus cycling, Edge Cases, Focusable Elements Detection - Fix jsdom offsetParent limitation via prototype-level mock - Remove temporary debug file (__debug.test.tsx) - Update test-strategy-plan.md to v1.9 with mutation score and debt tracking - Update README.md with final acceptance progress - Quality gates: TypeScript 0 errors, ESLint 0 errors, 121 suites/1549 tests passed - Coverage: 73.62% stmts / 82.52% branches (all thresholds met)
631 lines
22 KiB
TypeScript
631 lines
22 KiB
TypeScript
import { describe, it, expect, beforeEach, jest } from '@jest/globals';
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import { renderHook, render, screen, fireEvent } from '@testing-library/react';
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import { useState } from 'react';
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import { useFocusTrap } from './use-focus-trap';
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describe('useFocusTrap', () => {
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beforeEach(() => {
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jest.clearAllMocks();
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document.body.style.overflow = 'unset';
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// Mock offsetParent at prototype level for jsdom compatibility
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// jsdom 不支持 layout，offsetParent 始终返回 null，导致 getFocusableElements 过滤失效
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Object.defineProperty(HTMLElement.prototype, 'offsetParent', {
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get: () => document.body,
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configurable: true,
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});
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});
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describe('Initial State', () => {
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it('should return a ref', () => {
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const { result } = renderHook(() => useFocusTrap<HTMLDivElement>(false));
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expect(result.current).toBeDefined();
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expect(result.current.current).toBeNull();
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});
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});
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describe('When Active', () => {
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it('should store previous active element', () => {
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const activeElement = document.createElement('button');
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document.body.appendChild(activeElement);
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activeElement.focus();
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const { result } = renderHook(() => useFocusTrap<HTMLDivElement>(true));
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expect(result.current).toBeDefined();
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document.body.removeChild(activeElement);
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});
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it('should add keydown event listener', () => {
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const addEventListenerSpy = jest.spyOn(document, 'addEventListener');
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renderHook(() => useFocusTrap<HTMLDivElement>(true));
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expect(addEventListenerSpy).toHaveBeenCalledWith('keydown', expect.any(Function));
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});
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it('should set body overflow to hidden', () => {
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renderHook(() => useFocusTrap<HTMLDivElement>(true));
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expect(document.body.style.overflow).toBe('hidden');
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});
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});
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describe('When Inactive', () => {
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it('should not add keydown event listener', () => {
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const addEventListenerSpy = jest.spyOn(document, 'addEventListener');
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renderHook(() => useFocusTrap<HTMLDivElement>(false));
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expect(addEventListenerSpy).not.toHaveBeenCalled();
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});
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it('should not set body overflow', () => {
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renderHook(() => useFocusTrap<HTMLDivElement>(false));
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expect(document.body.style.overflow).toBe('unset');
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});
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});
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describe('Cleanup', () => {
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it('should remove keydown event listener on unmount', () => {
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const removeEventListenerSpy = jest.spyOn(document, 'removeEventListener');
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const { unmount } = renderHook(() => useFocusTrap<HTMLDivElement>(true));
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unmount();
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expect(removeEventListenerSpy).toHaveBeenCalledWith('keydown', expect.any(Function));
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});
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it('should restore body overflow on unmount', () => {
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const { unmount } = renderHook(() => useFocusTrap<HTMLDivElement>(true));
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unmount();
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expect(document.body.style.overflow).toBe('unset');
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});
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it('should clean up event listener when deactivating', () => {
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const removeEventListenerSpy = jest.spyOn(document, 'removeEventListener');
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const { rerender } = renderHook(
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({ isActive }) => useFocusTrap<HTMLDivElement>(isActive),
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{ initialProps: { isActive: true } }
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);
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rerender({ isActive: false });
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expect(removeEventListenerSpy).toHaveBeenCalledWith('keydown', expect.any(Function));
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});
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});
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describe('Focus Cycling', () => {
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function TrapComponent({ isActive }: { isActive: boolean }) {
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const ref = useFocusTrap<HTMLDivElement>(isActive);
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return (
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<div>
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<button>outside</button>
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<div ref={ref} data-testid="trap">
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<button data-testid="first-btn">first</button>
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<button data-testid="last-btn">last</button>
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</div>
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</div>
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);
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}
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it('should cycle focus from last to first on Tab', () => {
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render(<TrapComponent isActive />);
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const lastButton = screen.getByTestId('last-btn');
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// Focus the last button
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lastButton.focus();
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expect(document.activeElement).toBe(lastButton);
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// Tab should cycle to first button
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fireEvent.keyDown(document, { key: 'Tab' });
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// The handler should call preventDefault and firstElement.focus()
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expect(() => {
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fireEvent.keyDown(document, { key: 'Tab' });
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}).not.toThrow();
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});
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it('should cycle focus from first to last on Shift+Tab', () => {
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render(<TrapComponent isActive />);
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const firstButton = screen.getByTestId('first-btn');
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// Focus the first button
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firstButton.focus();
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expect(document.activeElement).toBe(firstButton);
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// Shift+Tab should cycle to last button
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expect(() => {
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fireEvent.keyDown(document, { key: 'Tab', shiftKey: true });
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}).not.toThrow();
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});
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it('should do nothing for Tab on middle element (not last)', () => {
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function ThreeButtonTrap() {
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const ref = useFocusTrap<HTMLDivElement>(true);
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return (
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<div>
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<button>outside</button>
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<div ref={ref} data-testid="trap-3btn">
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<button data-testid="first-btn">first</button>
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<button data-testid="middle-btn">middle</button>
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<button data-testid="last-btn">last</button>
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</div>
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</div>
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);
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}
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render(<ThreeButtonTrap />);
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const middleButton = screen.getByTestId('middle-btn');
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middleButton.focus();
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expect(document.activeElement).toBe(middleButton);
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// Tab on middle should NOT cycle (middle is not last)
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expect(() => {
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fireEvent.keyDown(document, { key: 'Tab' });
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}).not.toThrow();
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});
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it('should call preventDefault on Tab when focus is on last element', () => {
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const preventDefaultSpy = jest.spyOn(Event.prototype, 'preventDefault');
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render(<TrapComponent isActive />);
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const lastButton = screen.getByTestId('last-btn');
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lastButton.focus();
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fireEvent.keyDown(document, { key: 'Tab' });
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// The handler should call preventDefault because activeElement === lastElement
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expect(preventDefaultSpy).toHaveBeenCalled();
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preventDefaultSpy.mockRestore();
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});
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it('should call preventDefault on Shift+Tab when focus is on first element', () => {
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const preventDefaultSpy = jest.spyOn(Event.prototype, 'preventDefault');
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render(<TrapComponent isActive />);
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fireEvent.keyDown(document, { key: 'Tab', shiftKey: true });
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// The handler should call preventDefault because activeElement === firstElement
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expect(preventDefaultSpy).toHaveBeenCalled();
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preventDefaultSpy.mockRestore();
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});
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it('should not call preventDefault on Tab when focus is on middle element', () => {
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function ThreeButtonTrap() {
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const ref = useFocusTrap<HTMLDivElement>(true);
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return (
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<div>
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<button>outside</button>
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<div ref={ref} data-testid="trap-3btn">
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<button data-testid="first-btn">first</button>
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<button data-testid="middle-btn">middle</button>
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<button data-testid="last-btn">last</button>
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</div>
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</div>
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);
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}
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const preventDefaultSpy = jest.spyOn(Event.prototype, 'preventDefault');
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render(<ThreeButtonTrap />);
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const middleButton = screen.getByTestId('middle-btn');
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middleButton.focus();
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fireEvent.keyDown(document, { key: 'Tab' });
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// Middle element is not the last, so preventDefault should NOT be called
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expect(preventDefaultSpy).not.toHaveBeenCalled();
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preventDefaultSpy.mockRestore();
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});
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it('should not call preventDefault on Shift+Tab when focus is on last element', () => {
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function ThreeButtonTrap() {
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const ref = useFocusTrap<HTMLDivElement>(true);
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return (
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<div>
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<button>outside</button>
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<div ref={ref} data-testid="trap-3btn">
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<button data-testid="first-btn">first</button>
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<button data-testid="middle-btn">middle</button>
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<button data-testid="last-btn">last</button>
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</div>
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</div>
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);
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}
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const preventDefaultSpy = jest.spyOn(Event.prototype, 'preventDefault');
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render(<ThreeButtonTrap />);
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const lastButton = screen.getByTestId('last-btn');
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lastButton.focus();
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fireEvent.keyDown(document, { key: 'Tab', shiftKey: true });
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// Last element is not the first, so preventDefault should NOT be called
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expect(preventDefaultSpy).not.toHaveBeenCalled();
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preventDefaultSpy.mockRestore();
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});
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});
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describe('Escape Key Behavior', () => {
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function TrapComponent({ isActive }: { isActive: boolean }) {
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const ref = useFocusTrap<HTMLDivElement>(isActive);
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return (
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<div>
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<div ref={ref}>
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<button>first</button>
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<button>last</button>
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</div>
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</div>
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);
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}
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it('should call preventDefault on Escape key when active', () => {
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const preventDefaultSpy = jest.spyOn(Event.prototype, 'preventDefault');
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render(<TrapComponent isActive />);
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fireEvent.keyDown(document, { key: 'Escape' });
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expect(preventDefaultSpy).toHaveBeenCalled();
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preventDefaultSpy.mockRestore();
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});
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it('should call focus on previous active element on Escape', () => {
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const previous = document.createElement('button');
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previous.textContent = 'previous';
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const focusSpy = jest.spyOn(previous, 'focus');
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document.body.appendChild(previous);
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previous.focus();
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render(<TrapComponent isActive />);
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fireEvent.keyDown(document, { key: 'Escape' });
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expect(focusSpy).toHaveBeenCalled();
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document.body.removeChild(previous);
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focusSpy.mockRestore();
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});
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it('should not call preventDefault on non-Escape keys', () => {
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const preventDefaultSpy = jest.spyOn(Event.prototype, 'preventDefault');
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render(<TrapComponent isActive />);
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fireEvent.keyDown(document, { key: 'Enter' });
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fireEvent.keyDown(document, { key: 'ArrowUp' });
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// preventDefault should only be called for Tab and Escape, not for Enter/ArrowUp
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expect(preventDefaultSpy).not.toHaveBeenCalled();
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preventDefaultSpy.mockRestore();
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});
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it('should not call preventDefault on Escape when inactive', () => {
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const preventDefaultSpy = jest.spyOn(Event.prototype, 'preventDefault');
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render(<TrapComponent isActive={false} />);
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fireEvent.keyDown(document, { key: 'Escape' });
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// When inactive, no handler is registered, so preventDefault should not be called
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expect(preventDefaultSpy).not.toHaveBeenCalled();
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preventDefaultSpy.mockRestore();
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});
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it('should handle Escape without crashing when no previous element', () => {
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render(<TrapComponent isActive />);
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expect(() => {
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fireEvent.keyDown(document, { key: 'Escape' });
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}).not.toThrow();
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});
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});
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describe('State Changes', () => {
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it('should handle activation change', () => {
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const { result, rerender } = renderHook(
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({ isActive }) => useFocusTrap<HTMLDivElement>(isActive),
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{ initialProps: { isActive: false } }
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);
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expect(result.current).toBeDefined();
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rerender({ isActive: true });
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expect(document.body.style.overflow).toBe('hidden');
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rerender({ isActive: false });
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expect(document.body.style.overflow).toBe('unset');
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});
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it('should stop responding to events when deactivated', () => {
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const preventDefaultSpy = jest.spyOn(Event.prototype, 'preventDefault');
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const { rerender } = renderHook(
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({ isActive }) => useFocusTrap<HTMLDivElement>(isActive),
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{ initialProps: { isActive: true } }
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);
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// Deactivate
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rerender({ isActive: false });
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// With correct deps: listener is removed, so Escape should NOT trigger preventDefault
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// With wrong deps ([]): listener is still attached with isActive=true from closure
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fireEvent.keyDown(document, { key: 'Escape' });
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expect(preventDefaultSpy).not.toHaveBeenCalled();
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preventDefaultSpy.mockRestore();
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});
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it('should re-register event listener when isActive changes back to true', () => {
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const addEventListenerSpy = jest.spyOn(document, 'addEventListener');
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const { rerender } = renderHook(
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({ isActive }) => useFocusTrap<HTMLDivElement>(isActive),
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{ initialProps: { isActive: true } }
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);
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// Clear initial calls
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addEventListenerSpy.mockClear();
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// Deactivate - cleanup removes listener
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rerender({ isActive: false });
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// Activate again - should re-add listener
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rerender({ isActive: true });
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// Should have added a new listener when reactivating
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expect(addEventListenerSpy).toHaveBeenCalledWith('keydown', expect.any(Function));
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addEventListenerSpy.mockRestore();
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});
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it('should not respond to Escape when deactivated via state toggle (dependency tracking)', () => {
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function TrapWithToggle() {
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const [active, setActive] = useState(true);
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const ref = useFocusTrap<HTMLDivElement>(active);
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return (
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<div>
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<button data-testid="toggle-btn" onClick={() => setActive(false)}>Deactivate</button>
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<div ref={ref}>
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<button>first</button>
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<button>last</button>
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</div>
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</div>
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);
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}
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const preventDefaultSpy = jest.spyOn(Event.prototype, 'preventDefault');
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render(<TrapWithToggle />);
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// Deactivate via state toggle
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fireEvent.click(screen.getByTestId('toggle-btn'));
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// With correct deps: listener is removed, Escape should NOT trigger preventDefault
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// With wrong deps ([]): listener is still attached with isActive=true, Escape DOES trigger preventDefault
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fireEvent.keyDown(document, { key: 'Escape' });
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expect(preventDefaultSpy).not.toHaveBeenCalled();
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preventDefaultSpy.mockRestore();
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});
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it('should restore body overflow when deactivated via state toggle (dependency tracking)', () => {
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function TrapWithToggle() {
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const [active, setActive] = useState(true);
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const ref = useFocusTrap<HTMLDivElement>(active);
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return (
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<div>
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<button data-testid="toggle-overflow-btn" onClick={() => setActive(false)}>Deactivate</button>
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<div ref={ref}>
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<button>first</button>
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<button>last</button>
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</div>
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</div>
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);
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}
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render(<TrapWithToggle />);
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expect(document.body.style.overflow).toBe('hidden');
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// Deactivate via state toggle
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fireEvent.click(screen.getByTestId('toggle-overflow-btn'));
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// With correct deps: cleanup restores overflow to 'unset'
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// With wrong deps ([]): cleanup doesn't run, overflow stays 'hidden'
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expect(document.body.style.overflow).toBe('unset');
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});
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});
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describe('Edge Cases', () => {
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it('should handle empty container with no focusable elements', () => {
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function EmptyContainer() {
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const ref = useFocusTrap<HTMLDivElement>(true);
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return <div ref={ref} data-testid="empty" />;
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}
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render(<EmptyContainer />);
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expect(() => {
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fireEvent.keyDown(document, { key: 'Tab' });
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}).not.toThrow();
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});
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it('should handle disabled focusable elements', () => {
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function ContainerWithDisabled() {
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const ref = useFocusTrap<HTMLDivElement>(true);
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return (
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<div ref={ref} data-testid="disabled-container">
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<button disabled>disabled</button>
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<button data-testid="enabled-btn">enabled</button>
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</div>
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);
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}
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render(<ContainerWithDisabled />);
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// After useEffect, the first non-disabled focusable element is focused
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// Since the disabled button is excluded from focusable elements,
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// the enabled button should be focused (it's the only focusable element).
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// It's both first and last, so Tab should cycle to the same element.
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const preventDefaultSpy = jest.spyOn(Event.prototype, 'preventDefault');
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fireEvent.keyDown(document, { key: 'Tab' });
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// preventDefault should be called because activeElement === lastElement (same element)
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expect(preventDefaultSpy).toHaveBeenCalled();
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preventDefaultSpy.mockRestore();
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});
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it('should handle hidden focusable elements', () => {
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function ContainerWithHidden() {
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const ref = useFocusTrap<HTMLDivElement>(true);
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return (
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<div ref={ref} data-testid="hidden-container">
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<button style={{ display: 'none' }}>hidden</button>
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<button data-testid="visible-btn">visible</button>
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</div>
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);
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}
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render(<ContainerWithHidden />);
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// Override the prototype-level mock for the hidden element to test filtering
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const hiddenBtn = screen.getByTestId('hidden-container').querySelector('button:first-child');
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if (hiddenBtn) {
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Object.defineProperty(hiddenBtn, 'offsetParent', {
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value: null,
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configurable: true,
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});
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}
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const visibleButton = screen.getByTestId('visible-btn');
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visibleButton.focus();
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// Only the visible button is focusable, so it's both first and last.
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// Tab should cycle the visible element (it's first and last)
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const preventDefaultSpy = jest.spyOn(Event.prototype, 'preventDefault');
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fireEvent.keyDown(document, { key: 'Tab' });
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expect(preventDefaultSpy).toHaveBeenCalled();
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preventDefaultSpy.mockRestore();
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});
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it('should not respond to non-Tab non-Escape keys', () => {
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function SimpleTrap() {
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const ref = useFocusTrap<HTMLDivElement>(true);
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return (
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<div ref={ref}>
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<button data-testid="the-btn">btn</button>
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</div>
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);
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}
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render(<SimpleTrap />);
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const btn = screen.getByTestId('the-btn');
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btn.focus();
|
||
|
||
// Non-Tab/Escape keys should not trigger any focus change
|
||
expect(() => {
|
||
fireEvent.keyDown(document, { key: 'Enter' });
|
||
fireEvent.keyDown(document, { key: 'ArrowUp' });
|
||
fireEvent.keyDown(document, { key: ' ' });
|
||
}).not.toThrow();
|
||
});
|
||
});
|
||
|
||
describe('Key Event Filtering', () => {
|
||
function SimpleTrap() {
|
||
const ref = useFocusTrap<HTMLDivElement>(true);
|
||
return (
|
||
<div ref={ref}>
|
||
<button>first</button>
|
||
<button>last</button>
|
||
</div>
|
||
);
|
||
}
|
||
|
||
it('should not crash on Tab key when active', () => {
|
||
render(<SimpleTrap />);
|
||
expect(() => {
|
||
fireEvent.keyDown(document, { key: 'Tab' });
|
||
}).not.toThrow();
|
||
});
|
||
|
||
it('should not crash on Escape key when active', () => {
|
||
render(<SimpleTrap />);
|
||
expect(() => {
|
||
fireEvent.keyDown(document, { key: 'Escape' });
|
||
}).not.toThrow();
|
||
});
|
||
|
||
it('should not respond to events when inactive', () => {
|
||
function InactiveTrap() {
|
||
const ref = useFocusTrap<HTMLDivElement>(false);
|
||
return (
|
||
<div ref={ref}>
|
||
<button>first</button>
|
||
<button>last</button>
|
||
</div>
|
||
);
|
||
}
|
||
|
||
render(<InactiveTrap />);
|
||
|
||
// No handler registered, so events should not crash
|
||
expect(() => {
|
||
fireEvent.keyDown(document, { key: 'Tab' });
|
||
fireEvent.keyDown(document, { key: 'Escape' });
|
||
}).not.toThrow();
|
||
});
|
||
});
|
||
|
||
describe('Focusable Elements Detection', () => {
|
||
it('should handle various focusable element types', () => {
|
||
function ManyFocusableTypes() {
|
||
const ref = useFocusTrap<HTMLDivElement>(true);
|
||
return (
|
||
<div ref={ref} data-testid="many-types">
|
||
<button>button</button>
|
||
<a href="#">link</a>
|
||
<input data-testid="input-elem" />
|
||
<select><option>1</option></select>
|
||
<textarea />
|
||
<span tabIndex={0}>tabindex-zero</span>
|
||
</div>
|
||
);
|
||
}
|
||
|
||
render(<ManyFocusableTypes />);
|
||
|
||
// Focus the last focusable element (span with tabIndex=0) to trigger Tab cycling
|
||
const lastFocusable = screen.getByTestId('many-types').querySelector('[tabindex="0"]') as HTMLElement;
|
||
if (lastFocusable) lastFocusable.focus();
|
||
|
||
const preventDefaultSpy = jest.spyOn(Event.prototype, 'preventDefault');
|
||
fireEvent.keyDown(document, { key: 'Tab' });
|
||
// Multiple elements exist, so Tab should cycle
|
||
expect(preventDefaultSpy).toHaveBeenCalled();
|
||
preventDefaultSpy.mockRestore();
|
||
});
|
||
|
||
it('should handle container with only tabindex=-1 elements', () => {
|
||
function ContainerWithNegativeTabIndex() {
|
||
const ref = useFocusTrap<HTMLDivElement>(true);
|
||
return (
|
||
<div ref={ref} data-testid="negative-tab">
|
||
<button tabIndex={-1} data-testid="neg-btn">focusable-programmatically</button>
|
||
</div>
|
||
);
|
||
}
|
||
|
||
render(<ContainerWithNegativeTabIndex />);
|
||
|
||
const negBtn = screen.getByTestId('neg-btn');
|
||
negBtn.focus();
|
||
|
||
// tabindex=-1 is excluded by the selector, so no focusable elements
|
||
// Tab should not crash
|
||
expect(() => {
|
||
fireEvent.keyDown(document, { key: 'Tab' });
|
||
}).not.toThrow();
|
||
});
|
||
|
||
it('should handle detached ref (getFocusableElements returns [])', () => {
|
||
function NullContainer() {
|
||
useFocusTrap<HTMLDivElement>(true);
|
||
return <div>no ref attached</div>;
|
||
}
|
||
|
||
render(<NullContainer />);
|
||
|
||
expect(() => {
|
||
fireEvent.keyDown(document, { key: 'Tab' });
|
||
}).not.toThrow();
|
||
});
|
||
});
|
||
}); |