Resemble.js/nodejs-tests/errorPixelTransform.test.js

/* eslint-env jest*/

const resemble = require('../resemble');
const fs = require('fs');

const testErrorPixelTransform = transform => {
    const people = fs.readFileSync('./demoassets/ghost1.png');
    const people2 = fs.readFileSync('./demoassets/ghost2.png');

    return new Promise(resolve => {
        resemble.outputSettings({
            errorType: transform,
            errorColor: {
                red: 255,
                green: 255,
                blue: 0
            }
        });

        resemble(people)
            .compareTo(people2)
            .onComplete(data => {
                const buffer = data.getBuffer();

                expect(buffer).toBeInstanceOf(Buffer);

                const comparison = fs.readFileSync(
                    `./nodejs-tests/assets/pixelErrorTransform/${transform}.png`
                );

                expect(buffer.equals(comparison)).toBe(true);
                resolve();
            });
    });
};

describe('errorPixelTransform', () => {
    test('flat', async () => testErrorPixelTransform('flat'));

    test('movement', async () => testErrorPixelTransform('movement'));

    test('flatDifferenceIntensity', async () =>
        testErrorPixelTransform('flatDifferenceIntensity'));

    test('movementDifferenceIntensity', async () =>
        testErrorPixelTransform('movementDifferenceIntensity'));

    test('diffOnly', async () => testErrorPixelTransform('diffOnly'));
});