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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,48 +1,63 @@ | ||
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| const { setupPage } = require('../lib/jest-utilities.js') | ||
| const configPaths = require('../lib/paths.js') | ||
| const PORT = configPaths.testPort | ||
| const { goTo, isVisible } = require('../lib/puppeteer-helpers.js') | ||
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| let page | ||
| const baseUrl = 'http://localhost:' + PORT | ||
| describe('Back to top', () => { | ||
| let $module | ||
| let $backToTopLink | ||
| let pageHeight | ||
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| beforeAll(async () => { | ||
| page = await setupPage() | ||
| }) | ||
| async function setup (page) { | ||
| $module = await page.$('[data-module="app-back-to-top"]') | ||
| $backToTopLink = await $module.$('a') | ||
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| afterAll(async () => { | ||
| await page.close() | ||
| }) | ||
| // Scrollable height of body | ||
| pageHeight = await page.$eval('body', ($element) => $element.scrollHeight) ?? 0 | ||
| } | ||
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| const BACK_TO_TOP_LINK_SELECTOR = '[data-module="app-back-to-top"] a' | ||
| function scrollTo (page, scrollY) { | ||
| return page.evaluate((y) => window.scroll(0, y), scrollY) | ||
| } | ||
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| beforeEach(async () => { | ||
| await page.setJavaScriptEnabled(true) | ||
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| await goTo(page, '/styles/colour/') | ||
| await scrollTo(page, 0) | ||
| await setup(page) | ||
| }) | ||
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| describe('Back to top', () => { | ||
| it('is always visible when JavaScript is disabled', async () => { | ||
| await page.setJavaScriptEnabled(false) | ||
| await page.goto(`${baseUrl}/styles/colour/`, { waitUntil: 'load' }) | ||
| const isBackToTopVisible = await page.waitForSelector(BACK_TO_TOP_LINK_SELECTOR, { visible: true }) | ||
| expect(isBackToTopVisible).toBeTruthy() | ||
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| // Reload page again | ||
| await page.reload() | ||
| await setup(page) | ||
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| // Visible on page | ||
| await expect(isVisible($backToTopLink)).resolves.toBe(true) | ||
| }) | ||
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| it('is hidden when at the top of the page', async () => { | ||
| await page.goto(`${baseUrl}/styles/colour/`, { waitUntil: 'load' }) | ||
| const isBackToTopHidden = await page.waitForSelector(BACK_TO_TOP_LINK_SELECTOR, { visible: false }) | ||
| expect(isBackToTopHidden).toBeTruthy() | ||
| await scrollTo(page, 0) | ||
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| // Visible on page, hidden from viewport | ||
| await expect(isVisible($backToTopLink)).resolves.toBe(true) | ||
| await expect($backToTopLink.isIntersectingViewport()).resolves.toBe(false) | ||
| }) | ||
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| it('is visible when at the bottom of the page', async () => { | ||
| await page.goto(`${baseUrl}/styles/colour/`, { waitUntil: 'load' }) | ||
| // Scroll to the bottom of the page | ||
| await page.evaluate(() => window.scrollBy(0, document.body.scrollHeight)) | ||
| const isBackToTopVisible = await page.waitForSelector(BACK_TO_TOP_LINK_SELECTOR, { visible: true }) | ||
| expect(isBackToTopVisible).toBeTruthy() | ||
| await scrollTo(page, pageHeight) | ||
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| // Visible on page, shown in viewport | ||
| await expect(isVisible($backToTopLink)).resolves.toBe(true) | ||
| await expect($backToTopLink.isIntersectingViewport()).resolves.toBe(true) | ||
| }) | ||
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| it('goes back to the top of the page when interacted with', async () => { | ||
| await page.goto(`${baseUrl}/styles/colour/`, { waitUntil: 'load' }) | ||
| // Scroll to the bottom of the page | ||
| await page.evaluate(() => window.scrollBy(0, document.body.scrollHeight)) | ||
| // Make sure the back to top component is available to click | ||
| await page.waitForSelector(BACK_TO_TOP_LINK_SELECTOR, { visible: true }) | ||
| await page.click(BACK_TO_TOP_LINK_SELECTOR) | ||
| const isAtTopOfPage = await page.evaluate(() => window.scrollY === 0) | ||
| expect(isAtTopOfPage).toBeTruthy() | ||
| await scrollTo(page, pageHeight) | ||
| await $backToTopLink.click() | ||
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| // Scrolled to top | ||
| await expect(page.evaluate(() => window.scrollY)).resolves.toBe(0) | ||
| }) | ||
| }) |
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