html2canvas/tests/reftest-diff.ts

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import {sync} from 'glob';
import {resolve, basename} from 'path';
import {existsSync, promises} from 'fs';
import {toMatchImageSnapshot} from 'jest-image-snapshot';
const resultsDir = resolve(__dirname, '../results');
const customSnapshotsDir = resolve(__dirname, '../tmp/snapshots');
const customDiffDir = resolve(__dirname, '../tmp/snapshot-diffs');
expect.extend({toMatchImageSnapshot});
describe('Image diff', () => {
const files: string[] = sync('../tmp/reftests/**/*.png', {
cwd: __dirname,
root: resolve(__dirname, '../../')
}).filter((path) => existsSync(resolve(resultsDir, basename(path))));
it.each(files.map((path) => basename(path)))('%s', async (filename) => {
const previous = resolve(resultsDir, filename);
const previousSnap = resolve(customSnapshotsDir, `${filename}-snap.png`);
await promises.copyFile(previous, previousSnap);
const updated = resolve(__dirname, '../tmp/reftests/', filename);
const buffer = await promises.readFile(updated);
// @ts-ignore
expect(buffer).toMatchImageSnapshot({
customSnapshotsDir,
customSnapshotIdentifier: () => filename,
customDiffDir
});
});
});