status-react/visual-test/setup.js

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const { configureToMatchImageSnapshot } = require('jest-image-snapshot');
const fs = require('fs');
const path = require('path');
const kebabCase = require('lodash/kebabCase');
const expect = require('expect');
const toMatchImage = configureToMatchImageSnapshot({
comparisonMethod: 'ssim', failureThreshold: 0.002, failureThresholdType: 'percent'
});
expect.extend({ toMatchImage });
expect.extend({
async toMatchImageSnapshot(screenName) {
const platform = await device.getPlatform();
const deviceName = await device.name.split(' ').slice(1).join('');
const deviceType = 'iPhone 11 Pro';
const SNAPSHOTS_DIR = `__image_snapshots__/${platform}/${deviceType}`;
const { testPath, currentTestName } = this;
const customSnapshotsDir = path.join(path.dirname(testPath), SNAPSHOTS_DIR);
const customSnapshotIdentifier = kebabCase(`${path.basename(testPath)}-${currentTestName}-${screenName}`)
const tempPath = await device.takeScreenshot(screenName);
const image = fs.readFileSync(tempPath);
expect(image).toMatchImage({ customSnapshotIdentifier, customSnapshotsDir });
return { pass: true }
},
});
global.jestExpect = expect
beforeAll(async () => {
await device.launchApp();
});