unexpected-image/test/unexpectedImage.js

Image metadata plugin for the Unexpected assertion library

const unexpected = require('unexpected');
const pathModule = require('path');
const fs = require('fs');

describe('unexpected-image', () => {
  unexpected.output.preferredWidth = 80;

  const expect = unexpected
    .clone()
    .installPlugin(require('../lib/unexpectedImage'));

  const turtleJpegPath = pathModule.resolve(
    __dirname,
    '..',
    'testdata',
    'turtle.jpg'
  );

  const turtleJpeg = fs.readFileSync(turtleJpegPath);

  describe('with an image provided as a Buffer instance', () => {
    it('should succeed', () =>
      expect(turtleJpeg, 'to have metadata satisfying', {
        format: 'JPEG',
        size: {
          width: 481,
        },
      }));

    it('should fail with a diff', () =>
      expect(
        expect(turtleJpeg, 'to have metadata satisfying', {
          format: 'JPEG',
          size: {
            width: 481,
            height: 426,
          },
          Interlace: 'Yes',
          Resolution: '96x96 pixels/inch',
        }),
        'when rejected',
        'to have message',
        /height: 424 \/\/ should equal 426/
      ));
  });

  describe('with an image provided as a Uint8Array instance', () => {
    it('should succeed', () =>
      expect(new Uint8Array(turtleJpeg), 'to have metadata satisfying', {
        format: 'JPEG',
        size: {
          width: 481,
        },
      }));

    it('should fail with a diff', () =>
      expect(
        expect(new Uint8Array(turtleJpeg), 'to have metadata satisfying', {
          format: 'JPEG',
          size: {
            width: 481,
            height: 426,
          },
          Interlace: 'Yes',
          Resolution: '96x96 pixels/inch',
        }),
        'when rejected',
        'to have message',
        /height: 424 \/\/ should equal 426/
      ));
  });

  describe('with an image provided as a file name', () => {
    it('should succeed', () =>
      expect(turtleJpegPath, 'to have metadata satisfying', {
        format: 'JPEG',
        size: {
          width: 481,
        },
      }));

    it('should fail with a diff', () =>
      expect(
        expect(turtleJpegPath, 'to have metadata satisfying', {
          format: 'JPEG',
          size: {
            width: 481,
            height: 426,
          },
          Interlace: 'Yes',
          Resolution: '96x96 pixels/inch',
        }),
        'when rejected',
        'to have message',
        /height: 424 \/\/ should equal 426/
      ));
  });

  it('should identify an image despite of a wrong extension', () =>
    expect(
      pathModule.resolve(__dirname, '..', 'testdata', 'reallyapng.jpg'),
      'to have metadata satisfying',
      {
        format: 'PNG',
      }
    ));

  it('should fail with an error message if the file type is unsupported', () =>
    expect(
      expect(
        pathModule.resolve(__dirname, '..', 'testdata', 'foo.data'),
        'to have metadata satisfying',
        {
          format: 'PNG',
        }
      ),
      'to be rejected with',
      /gm identify: No decode delegate for this image format/
    ));

  it('should support identifying an image given by a data: url', () =>
    expect(
      'data:image/png;base64,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',
      'to have metadata satisfying',
      {
        format: 'PNG',
        Geometry: '20x20',
      }
    ));
});