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

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

describe('resemble', () => {
  test('base64', () => {
    const people_src =
      'data:image/jpeg;base64,' +
      fs.readFileSync('./demoassets/People.jpg', 'base64');
    const people2_src =
      'data:image/jpeg;base64,' +
      fs.readFileSync('./demoassets/People2.jpg', 'base64');

    return new Promise(function(resolve, reject) {
      resemble(people_src).compareTo(people2_src).onComplete(function(data) {
        // console.info('Reached oncomplete for base64_string');
        expect(data.diffBounds.bottom).toEqual(431);
        expect(data.diffBounds.left).toEqual(22);
        expect(data.diffBounds.right).toEqual(450);
        expect(data.diffBounds.top).toEqual(58);
        expect(data.dimensionDifference.height).toEqual(0);
        expect(data.dimensionDifference.width).toEqual(0);
        expect(data.isSameDimensions).toBe(true);
        expect(data.misMatchPercentage).toEqual('8.66');
        resolve();
      });
    });
  });

  test('files', () => {
    return new Promise(function(resolve, reject) {
      resemble('./demoassets/People.jpg')
        .compareTo('./demoassets/People2.jpg')
        .onComplete(function(data) {
          // console.info('Reached oncomplete for request_success');
          expect(data.diffBounds).toEqual(
            expect.objectContaining({
              bottom: expect.any(Number),
              left: expect.any(Number),
              top: expect.any(Number),
              right: expect.any(Number)
            })
          );

          expect(data.diffBounds.bottom).toEqual(431);
          expect(data.diffBounds.left).toEqual(22);
          expect(data.diffBounds.right).toEqual(450);
          expect(data.diffBounds.top).toEqual(58);
          expect(data.dimensionDifference.height).toEqual(0);
          expect(data.dimensionDifference.width).toEqual(0);
          expect(data.isSameDimensions).toBe(true);
          expect(data.misMatchPercentage).toEqual('8.66');
          resolve();
        });
    });
  });

  test('file not found', () => {
    return new Promise(function(resolve, reject) {
      resemble('../demoassets/People.jpg')
        .compareTo('../demoassets/404-image.jpg')
        .onComplete(function(data) {
          // console.info('Reached oncomplete for request_404');
          // console.log(data);
          expect(data.error).toEqual('Image load error.');
          resolve();
        });
    });
  });

  test('node buffers', () => {
    const people = fs.readFileSync('./demoassets/People.jpg');
    const people2 = fs.readFileSync('./demoassets/People2.jpg');

    return new Promise(function(resolve, reject) {
      resemble(people).compareTo(people2).onComplete(function(data) {
        // console.info('Reached oncomplete for base64_string');
        expect(data.diffBounds.bottom).toEqual(431);
        expect(data.diffBounds.left).toEqual(22);
        expect(data.diffBounds.right).toEqual(450);
        expect(data.diffBounds.top).toEqual(58);
        expect(data.dimensionDifference.height).toEqual(0);
        expect(data.dimensionDifference.width).toEqual(0);
        expect(data.isSameDimensions).toBe(true);
        expect(data.misMatchPercentage).toEqual('8.66');
        resolve();
      });
    });
  });
});