|
| 1 | +import { render, screen } from '@testing-library/react'; |
| 2 | +import userEvent from '@testing-library/user-event'; |
| 3 | +import { describe, expect, it, vi, beforeEach, afterEach } from 'vitest'; |
| 4 | +import { axe } from 'vitest-axe'; |
| 5 | +import App from '../App'; |
| 6 | +import { isDNTEnabled, useVitals } from '../hooks/useVitals'; |
| 7 | +import * as analytics from '../analytics'; |
| 8 | +import { renderHook, act } from '@testing-library/react'; |
| 9 | +import { HelmetProvider } from 'react-helmet-async'; |
| 10 | + |
| 11 | +describe('DNT Helper & Web Vitals Hook', () => { |
| 12 | + const originalNavigator = window.navigator; |
| 13 | + |
| 14 | + afterEach(() => { |
| 15 | + vi.restoreAllMocks(); |
| 16 | + }); |
| 17 | + |
| 18 | + it('detects Do-Not-Track when navigator.doNotTrack is "1"', () => { |
| 19 | + Object.defineProperty(window, 'navigator', { |
| 20 | + value: { ...originalNavigator, doNotTrack: '1' }, |
| 21 | + configurable: true, |
| 22 | + }); |
| 23 | + expect(isDNTEnabled()).toBe(true); |
| 24 | + }); |
| 25 | + |
| 26 | + it('detects Do-Not-Track when navigator.doNotTrack is "0"', () => { |
| 27 | + Object.defineProperty(window, 'navigator', { |
| 28 | + value: { ...originalNavigator, doNotTrack: '0' }, |
| 29 | + configurable: true, |
| 30 | + }); |
| 31 | + expect(isDNTEnabled()).toBe(false); |
| 32 | + }); |
| 33 | + |
| 34 | + it('suppresses tracking telemetry when DNT is enabled', () => { |
| 35 | + Object.defineProperty(window, 'navigator', { |
| 36 | + value: { ...originalNavigator, doNotTrack: '1' }, |
| 37 | + configurable: true, |
| 38 | + }); |
| 39 | + const trackSpy = vi.spyOn(analytics, 'trackEvent'); |
| 40 | + |
| 41 | + const { result } = renderHook(() => useVitals()); |
| 42 | + act(() => { |
| 43 | + result.current.recordVital('LCP', 1.2, '/'); |
| 44 | + }); |
| 45 | + |
| 46 | + expect(trackSpy).not.toHaveBeenCalled(); |
| 47 | + expect(result.current.recordedVitals.length).toBe(1); |
| 48 | + expect(result.current.recordedVitals[0]!.metric).toBe('LCP'); |
| 49 | + }); |
| 50 | + |
| 51 | + it('dispatches tracking telemetry event when DNT is disabled', () => { |
| 52 | + Object.defineProperty(window, 'navigator', { |
| 53 | + value: { ...originalNavigator, doNotTrack: '0' }, |
| 54 | + configurable: true, |
| 55 | + }); |
| 56 | + const trackSpy = vi.spyOn(analytics, 'trackEvent').mockImplementation(() => {}); |
| 57 | + |
| 58 | + const { result } = renderHook(() => useVitals()); |
| 59 | + act(() => { |
| 60 | + result.current.recordVital('INP', 45, '/'); |
| 61 | + }); |
| 62 | + |
| 63 | + expect(trackSpy).toHaveBeenCalledWith('Web Vital', { |
| 64 | + props: { |
| 65 | + metric: 'INP', |
| 66 | + value: 45, |
| 67 | + rating: 'good', |
| 68 | + page: '/', |
| 69 | + }, |
| 70 | + }); |
| 71 | + }); |
| 72 | +}); |
| 73 | + |
| 74 | +describe('Web Vitals Dashboard Page (/vitals)', () => { |
| 75 | + beforeEach(() => { |
| 76 | + window.history.replaceState({}, '', '/vitals'); |
| 77 | + }); |
| 78 | + |
| 79 | + it('renders the Web Vitals dashboard title and DNT badge', async () => { |
| 80 | + render( |
| 81 | + <HelmetProvider> |
| 82 | + <App /> |
| 83 | + </HelmetProvider>, |
| 84 | + ); |
| 85 | + |
| 86 | + expect( |
| 87 | + await screen.findByRole('heading', { name: /web vitals dashboard/i, level: 1 }), |
| 88 | + ).toBeInTheDocument(); |
| 89 | + expect(screen.getByText(/dnt respected/i)).toBeInTheDocument(); |
| 90 | + }); |
| 91 | + |
| 92 | + it('displays summary cards for LCP, INP, and CLS', async () => { |
| 93 | + render( |
| 94 | + <HelmetProvider> |
| 95 | + <App /> |
| 96 | + </HelmetProvider>, |
| 97 | + ); |
| 98 | + |
| 99 | + await screen.findByRole('heading', { name: /web vitals dashboard/i, level: 1 }); |
| 100 | + |
| 101 | + expect(screen.getAllByText('Largest Contentful Paint').length).toBeGreaterThanOrEqual(1); |
| 102 | + expect(screen.getAllByText('Interaction to Next Paint').length).toBeGreaterThanOrEqual(1); |
| 103 | + expect(screen.getAllByText('Cumulative Layout Shift').length).toBeGreaterThanOrEqual(1); |
| 104 | + }); |
| 105 | + |
| 106 | + it('allows metric tab switching and page selection filter', async () => { |
| 107 | + const user = userEvent.setup(); |
| 108 | + render( |
| 109 | + <HelmetProvider> |
| 110 | + <App /> |
| 111 | + </HelmetProvider>, |
| 112 | + ); |
| 113 | + |
| 114 | + await screen.findByRole('heading', { name: /web vitals dashboard/i, level: 1 }); |
| 115 | + |
| 116 | + // Switch metric tab to INP |
| 117 | + const inpTab = screen.getByRole('tab', { name: 'INP' }); |
| 118 | + await user.click(inpTab); |
| 119 | + expect(inpTab).toHaveAttribute('aria-selected', 'true'); |
| 120 | + expect( |
| 121 | + screen.getByRole('heading', { name: /rolling 30-day interaction to next paint/i }), |
| 122 | + ).toBeInTheDocument(); |
| 123 | + |
| 124 | + // Select page filter |
| 125 | + const select = screen.getByLabelText(/page:/i); |
| 126 | + await user.selectOptions(select, '/faq'); |
| 127 | + expect((select as HTMLSelectElement).value).toBe('/faq'); |
| 128 | + }); |
| 129 | + |
| 130 | + it('documents what each Core Web Vital metric means', async () => { |
| 131 | + render( |
| 132 | + <HelmetProvider> |
| 133 | + <App /> |
| 134 | + </HelmetProvider>, |
| 135 | + ); |
| 136 | + |
| 137 | + await screen.findByRole('heading', { name: /web vitals dashboard/i, level: 1 }); |
| 138 | + expect(screen.getByText(/understanding core web vitals/i)).toBeInTheDocument(); |
| 139 | + expect(screen.getByText(/measures perceived loading speed/i)).toBeInTheDocument(); |
| 140 | + expect(screen.getByText(/measures overall page responsiveness/i)).toBeInTheDocument(); |
| 141 | + expect(screen.getByText(/measures visual stability/i)).toBeInTheDocument(); |
| 142 | + }); |
| 143 | + |
| 144 | + it('passes accessibility checks with no violations', async () => { |
| 145 | + const { container } = render( |
| 146 | + <HelmetProvider> |
| 147 | + <App /> |
| 148 | + </HelmetProvider>, |
| 149 | + ); |
| 150 | + |
| 151 | + await screen.findByRole('heading', { name: /web vitals dashboard/i, level: 1 }); |
| 152 | + const results = await axe(container); |
| 153 | + expect(results.violations).toEqual([]); |
| 154 | + }); |
| 155 | +}); |
0 commit comments