playwright/tests/page/page-emulate-media.spec.ts

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/**
* Copyright 2018 Google Inc. All rights reserved.
* Modifications copyright (c) Microsoft Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { test as it, expect } from './pageTest';
it.skip(({ isAndroid }) => isAndroid);
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it('should emulate type @smoke', async ({ page }) => {
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expect(await page.evaluate(() => matchMedia('screen').matches)).toBe(true);
expect(await page.evaluate(() => matchMedia('print').matches)).toBe(false);
await page.emulateMedia({ media: 'print' });
expect(await page.evaluate(() => matchMedia('screen').matches)).toBe(false);
expect(await page.evaluate(() => matchMedia('print').matches)).toBe(true);
await page.emulateMedia({});
expect(await page.evaluate(() => matchMedia('screen').matches)).toBe(false);
expect(await page.evaluate(() => matchMedia('print').matches)).toBe(true);
await page.emulateMedia({ media: null });
expect(await page.evaluate(() => matchMedia('screen').matches)).toBe(true);
expect(await page.evaluate(() => matchMedia('print').matches)).toBe(false);
});
it('should throw in case of bad media argument', async ({ page }) => {
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let error = null;
// @ts-expect-error 'bad' is not a valid media type
await page.emulateMedia({ media: 'bad' }).catch(e => error = e);
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expect(error.message).toContain('media: expected one of (screen|print|null)');
});
it('should emulate colorScheme should work @smoke', async ({ page }) => {
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await page.emulateMedia({ colorScheme: 'light' });
expect(await page.evaluate(() => matchMedia('(prefers-color-scheme: light)').matches)).toBe(true);
expect(await page.evaluate(() => matchMedia('(prefers-color-scheme: dark)').matches)).toBe(false);
await page.emulateMedia({ colorScheme: 'dark' });
expect(await page.evaluate(() => matchMedia('(prefers-color-scheme: dark)').matches)).toBe(true);
expect(await page.evaluate(() => matchMedia('(prefers-color-scheme: light)').matches)).toBe(false);
});
it('should default to light', async ({ page }) => {
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expect(await page.evaluate(() => matchMedia('(prefers-color-scheme: light)').matches)).toBe(true);
expect(await page.evaluate(() => matchMedia('(prefers-color-scheme: dark)').matches)).toBe(false);
await page.emulateMedia({ colorScheme: 'dark' });
expect(await page.evaluate(() => matchMedia('(prefers-color-scheme: dark)').matches)).toBe(true);
expect(await page.evaluate(() => matchMedia('(prefers-color-scheme: light)').matches)).toBe(false);
await page.emulateMedia({ colorScheme: null });
expect(await page.evaluate(() => matchMedia('(prefers-color-scheme: dark)').matches)).toBe(false);
expect(await page.evaluate(() => matchMedia('(prefers-color-scheme: light)').matches)).toBe(true);
});
it('should throw in case of bad colorScheme argument', async ({ page }) => {
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let error = null;
// @ts-expect-error 'bad' is not a valid media type
await page.emulateMedia({ colorScheme: 'bad' }).catch(e => error = e);
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expect(error.message).toContain('colorScheme: expected one of (dark|light|no-preference|null)');
});
it('should work during navigation', async ({ page, server }) => {
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await page.emulateMedia({ colorScheme: 'light' });
const navigated = page.goto(server.EMPTY_PAGE);
for (let i = 0; i < 9; i++) {
await Promise.all([
page.emulateMedia({ colorScheme: (['dark', 'light'] as const)[i & 1] }),
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new Promise(f => setTimeout(f, 1)),
]);
}
await navigated;
expect(await page.evaluate(() => matchMedia('(prefers-color-scheme: dark)').matches)).toBe(true);
});
it('should change the actual colors in css', async ({ page }) => {
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await page.setContent(`
<style>
@media (prefers-color-scheme: dark) {
div {
background: black;
color: white;
}
}
@media (prefers-color-scheme: light) {
div {
background: white;
color: black;
}
}
</style>
<div>Hello</div>
`);
function getBackgroundColor() {
return page.$eval('div', div => window.getComputedStyle(div).backgroundColor);
}
await page.emulateMedia({ colorScheme: 'light' });
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expect(await getBackgroundColor()).toBe('rgb(255, 255, 255)');
await page.emulateMedia({ colorScheme: 'dark' });
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expect(await getBackgroundColor()).toBe('rgb(0, 0, 0)');
await page.emulateMedia({ colorScheme: 'light' });
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expect(await getBackgroundColor()).toBe('rgb(255, 255, 255)');
});
it('should emulate reduced motion', async ({ page }) => {
expect(await page.evaluate(() => matchMedia('(prefers-reduced-motion: no-preference)').matches)).toBe(true);
await page.emulateMedia({ reducedMotion: 'reduce' });
expect(await page.evaluate(() => matchMedia('(prefers-reduced-motion: reduce)').matches)).toBe(true);
expect(await page.evaluate(() => matchMedia('(prefers-reduced-motion: no-preference)').matches)).toBe(false);
await page.emulateMedia({ reducedMotion: 'no-preference' });
expect(await page.evaluate(() => matchMedia('(prefers-reduced-motion: reduce)').matches)).toBe(false);
expect(await page.evaluate(() => matchMedia('(prefers-reduced-motion: no-preference)').matches)).toBe(true);
await page.emulateMedia({ reducedMotion: null });
});
it('should emulate forcedColors ', async ({ page, browserName, isElectron }) => {
it.skip(browserName === 'webkit', 'https://bugs.webkit.org/show_bug.cgi?id=225281');
it.fixme(isElectron);
expect(await page.evaluate(() => matchMedia('(forced-colors: none)').matches)).toBe(true);
await page.emulateMedia({ forcedColors: 'none' });
expect(await page.evaluate(() => matchMedia('(forced-colors: none)').matches)).toBe(true);
expect(await page.evaluate(() => matchMedia('(forced-colors: active)').matches)).toBe(false);
await page.emulateMedia({ forcedColors: 'active' });
expect(await page.evaluate(() => matchMedia('(forced-colors: none)').matches)).toBe(false);
expect(await page.evaluate(() => matchMedia('(forced-colors: active)').matches)).toBe(true);
await page.emulateMedia({ forcedColors: null });
expect(await page.evaluate(() => matchMedia('(forced-colors: none)').matches)).toBe(true);
});