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test: add a failing test for the issue 4038 (#4111)

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Chromium corrupts screenshots taller than 8192.
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Dmitry Gozman 2020-10-10 21:50:37 -07:00 committed by GitHub
parent 5648eac063
commit 80ed407033
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1 changed files with 32 additions and 0 deletions
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32
test/page-screenshot.spec.ts
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@ -19,6 +19,7 @@ import { it, expect, describe } from './fixtures';
import { verifyViewport } from './utils';
import path from 'path';
import fs from 'fs';
import { PNG } from 'pngjs';
// Firefox headful produces a different image.
@ -290,4 +291,35 @@ describe('page screenshot', (suite, { browserName, headful }) => {
const error = await page.screenshot({ path: 'file.txt' }).catch(e => e);
expect(error.message).toContain('path: unsupported mime type "text/plain"');
});
it('should work with large size', (test, { browserName }) => {
test.fail(browserName === 'chromium', 'Upstream Chromium bug');
}, async ({ page }) => {
await page.setViewportSize({ width: 1280, height: 800 });
await page.evaluate(() => {
document.body.style.margin = '0';
document.body.style.padding = '0';
document.documentElement.style.margin = '0';
document.documentElement.style.padding = '0';
const div = document.createElement('div');
div.style.width = '1250px';
div.style.height = '8440px';
div.style.background = 'linear-gradient(red, blue)';
document.body.appendChild(div);
});
const buffer = await page.screenshot({ fullPage: true });
const decoded = PNG.sync.read(buffer);
const pixel = (x: number, y: number) => {
const dst = new PNG({ width: 1, height: 1 });
PNG.bitblt(decoded, dst, x, y, 1, 1);
const pixels = dst.data;
return { r: pixels[0], g: pixels[1], b: pixels[2], a: pixels[3] };
};
expect(pixel(0, 0).r).toBeGreaterThan(128);
expect(pixel(0, 0).b).toBeLessThan(128);
expect(pixel(0, 8339).r).toBeLessThan(128);
expect(pixel(0, 8339).b).toBeGreaterThan(128);
});
});