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/**
* @license
* Copyright 2018 Google Inc.
* SPDX-License-Identifier: Apache-2.0
*/
import assert from 'assert';
import expect from 'expect';
import {getTestState, launch, setupTestBrowserHooks} from './mocha-utils.js';
describe('Screenshots', function () {
setupTestBrowserHooks();
describe('Page.screenshot', function () {
it('should work', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.goto(server.PREFIX + '/grid.html');
const screenshot = await page.screenshot();
expect(screenshot).toBeGolden('screenshot-sanity.png');
});
it('should clip rect', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.goto(server.PREFIX + '/grid.html');
const screenshot = await page.screenshot({
clip: {
x: 50,
y: 100,
width: 150,
height: 100,
},
});
expect(screenshot).toBeGolden('screenshot-clip-rect.png');
});
it('should get screenshot bigger than the viewport', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 50, height: 50});
await page.goto(server.PREFIX + '/grid.html');
const screenshot = await page.screenshot({
clip: {
x: 25,
y: 25,
width: 100,
height: 100,
},
});
expect(screenshot).toBeGolden('screenshot-offscreen-clip.png');
});
it('should clip clip bigger than the viewport without "captureBeyondViewport"', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 50, height: 50});
await page.goto(server.PREFIX + '/grid.html');
const screenshot = await page.screenshot({
captureBeyondViewport: false,
clip: {
x: 25,
y: 25,
width: 100,
height: 100,
},
});
expect(screenshot).toBeGolden('screenshot-offscreen-clip-2.png');
});
it('should run in parallel', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.goto(server.PREFIX + '/grid.html');
const promises = [];
for (let i = 0; i < 3; ++i) {
promises.push(
page.screenshot({
clip: {
x: 50 * i,
y: 0,
width: 50,
height: 50,
},
})
);
}
const screenshots = await Promise.all(promises);
expect(screenshots[1]).toBeGolden('grid-cell-1.png');
});
it('should take fullPage screenshots', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.goto(server.PREFIX + '/grid.html');
const screenshot = await page.screenshot({
fullPage: true,
});
expect(screenshot).toBeGolden('screenshot-grid-fullpage.png');
});
it('should take fullPage screenshots without captureBeyondViewport', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.goto(server.PREFIX + '/grid.html');
const screenshot = await page.screenshot({
fullPage: true,
captureBeyondViewport: false,
});
expect(screenshot).toBeGolden('screenshot-grid-fullpage-2.png');
expect(page.viewport()).toMatchObject({width: 500, height: 500});
});
it('should run in parallel in multiple pages', async () => {
const {server, context} = await getTestState();
const N = 2;
const pages = await Promise.all(
Array(N)
.fill(0)
.map(async () => {
const page = await context.newPage();
await page.goto(server.PREFIX + '/grid.html');
return page;
})
);
const promises = [];
for (let i = 0; i < N; ++i) {
promises.push(
pages[i]!.screenshot({
clip: {x: 50 * i, y: 0, width: 50, height: 50},
})
);
}
const screenshots = await Promise.all(promises);
for (let i = 0; i < N; ++i) {
expect(screenshots[i]).toBeGolden(`grid-cell-${i}.png`);
}
await Promise.all(
pages.map(page => {
return page.close();
})
);
});
it('should work with odd clip size on Retina displays', async () => {
const {page} = await getTestState();
// Make sure documentElement height is at least 11px.
await page.setContent(`<div style="width: 11px; height: 11px;">`);
const screenshot = await page.screenshot({
clip: {
x: 0,
y: 0,
width: 11,
height: 11,
},
});
expect(screenshot).toBeGolden('screenshot-clip-odd-size.png');
});
it('should return base64', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.goto(server.PREFIX + '/grid.html');
const screenshot = await page.screenshot({
encoding: 'base64',
});
expect(Buffer.from(screenshot, 'base64')).toBeGolden(
'screenshot-sanity.png'
);
});
});
describe('ElementHandle.screenshot', function () {
it('should work', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.goto(server.PREFIX + '/grid.html');
await page.evaluate(() => {
return window.scrollBy(50, 100);
});
using elementHandle = (await page.$('.box:nth-of-type(3)'))!;
const screenshot = await elementHandle.screenshot();
expect(screenshot).toBeGolden('screenshot-element-bounding-box.png');
});
it('should work with a null viewport', async () => {
const {server} = await getTestState({
skipLaunch: true,
});
const {browser, close} = await launch({
defaultViewport: null,
});
try {
const page = await browser.newPage();
await page.goto(server.PREFIX + '/grid.html');
await page.evaluate(() => {
return window.scrollBy(50, 100);
});
using elementHandle = await page.$('.box:nth-of-type(3)');
assert(elementHandle);
const screenshot = await elementHandle.screenshot();
expect(screenshot).toBeTruthy();
} finally {
await close();
}
});
it('should take into account padding and border', async () => {
const {page} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.setContent(`
something above
<style>div {
border: 2px solid blue;
background: green;
width: 50px;
height: 50px;
}
</style>
<div></div>
`);
using elementHandle = (await page.$('div'))!;
const screenshot = await elementHandle.screenshot();
expect(screenshot).toBeGolden('screenshot-element-padding-border.png');
});
it('should capture full element when larger than viewport', async () => {
const {page} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.setContent(`
something above
<style>
:root {
scrollbar-width: none;
}
div.to-screenshot {
border: 1px solid blue;
width: 600px;
height: 600px;
margin-left: 50px;
}
</style>
<div class="to-screenshot"></div>
`);
using elementHandle = (await page.$('div.to-screenshot'))!;
const screenshot = await elementHandle.screenshot();
expect(screenshot).toBeGolden(
'screenshot-element-larger-than-viewport.png'
);
expect(
await page.evaluate(() => {
return {
w: window.innerWidth,
h: window.innerHeight,
};
})
).toEqual({w: 500, h: 500});
});
it('should scroll element into view', async () => {
const {page} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.setContent(`
something above
<style>div.above {
border: 2px solid blue;
background: red;
height: 1500px;
}
div.to-screenshot {
border: 2px solid blue;
background: green;
width: 50px;
height: 50px;
}
</style>
<div class="above"></div>
<div class="to-screenshot"></div>
`);
using elementHandle = (await page.$('div.to-screenshot'))!;
const screenshot = await elementHandle.screenshot();
expect(screenshot).toBeGolden(
'screenshot-element-scrolled-into-view.png'
);
});
it('should work with a rotated element', async () => {
const {page} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.setContent(`<div style="position:absolute;
top: 100px;
left: 100px;
width: 100px;
height: 100px;
background: green;
transform: rotateZ(200deg);"> </div>`);
using elementHandle = (await page.$('div'))!;
const screenshot = await elementHandle.screenshot();
expect(screenshot).toBeGolden('screenshot-element-rotate.png');
});
it('should fail to screenshot a detached element', async () => {
const {page} = await getTestState();
await page.setContent('<h1>remove this</h1>');
using elementHandle = (await page.$('h1'))!;
await page.evaluate((element: HTMLElement) => {
return element.remove();
}, elementHandle);
const screenshotError = await elementHandle.screenshot().catch(error => {
return error;
});
expect(screenshotError.message).toBe(
'Node is either not visible or not an HTMLElement'
);
});
it('should not hang with zero width/height element', async () => {
const {page} = await getTestState();
await page.setContent('<div style="width: 50px; height: 0"></div>');
using div = (await page.$('div'))!;
const error = await div.screenshot().catch(error_ => {
return error_;
});
expect(error.message).toBe('Node has 0 height.');
});
it('should work for an element with fractional dimensions', async () => {
const {page} = await getTestState();
await page.setContent(
'<div style="width:48.51px;height:19.8px;border:1px solid black;"></div>'
);
using elementHandle = (await page.$('div'))!;
const screenshot = await elementHandle.screenshot();
expect(screenshot).toBeGolden('screenshot-element-fractional.png');
});
it('should work for an element with an offset', async () => {
const {page} = await getTestState();
await page.setContent(
'<div style="position:absolute; top: 10.3px; left: 20.4px;width:50.3px;height:20.2px;border:1px solid black;"></div>'
);
using elementHandle = (await page.$('div'))!;
const screenshot = await elementHandle.screenshot();
expect(screenshot).toBeGolden('screenshot-element-fractional-offset.png');
});
it('should work with webp', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 100, height: 100});
await page.goto(server.PREFIX + '/grid.html');
const screenshot = await page.screenshot({
type: 'webp',
});
expect(screenshot).toBeInstanceOf(Buffer);
});
it('should run in parallel in multiple pages', async () => {
const {browser, server} = await getTestState();
const context = await browser.createBrowserContext();
const N = 2;
const pages = await Promise.all(
Array(N)
.fill(0)
.map(async () => {
const page = await context.newPage();
await page.goto(server.PREFIX + '/grid.html');
return page;
})
);
const promises = [];
for (let i = 0; i < N; ++i) {
promises.push(
pages[i]!.screenshot({
clip: {x: 50 * i, y: 0, width: 50, height: 50},
})
);
}
const screenshots = await Promise.all(promises);
for (let i = 0; i < N; ++i) {
expect(screenshots[i]).toBeGolden(`grid-cell-${i}.png`);
}
await Promise.all(
pages.map(page => {
return page.close();
})
);
await context.close();
});
it('should use element clip', async () => {
const {page} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.setContent(`
something above
<style>div {
border: 2px solid blue;
background: green;
width: 50px;
height: 50px;
}
</style>
<div></div>
`);
using elementHandle = (await page.$('div'))!;
const screenshot = await elementHandle.screenshot({
clip: {
x: 10,
y: 10,
width: 20,
height: 20,
},
});
expect(screenshot).toBeGolden('screenshot-element-clip.png');
});
});
describe('Cdp', () => {
it('should use scale for clip', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.goto(server.PREFIX + '/grid.html');
const screenshot = await page.screenshot({
clip: {
x: 50,
y: 100,
width: 150,
height: 100,
scale: 2,
},
});
expect(screenshot).toBeGolden('screenshot-clip-rect-scale2.png');
});
it('should allow transparency', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 100, height: 100});
await page.goto(server.EMPTY_PAGE);
const screenshot = await page.screenshot({omitBackground: true});
expect(screenshot).toBeGolden('transparent.png');
});
it('should render white background on jpeg file', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 100, height: 100});
await page.goto(server.EMPTY_PAGE);
const screenshot = await page.screenshot({
omitBackground: true,
type: 'jpeg',
});
expect(screenshot).toBeGolden('white.jpg');
});
it('should work in "fromSurface: false" mode', async () => {
const {page, server} = await getTestState();
await page.setViewport({width: 500, height: 500});
await page.goto(server.PREFIX + '/grid.html');
const screenshot = await page.screenshot({
fromSurface: false,
});
expect(screenshot).toBeDefined();
});
});
});