utils.spec.js

import { isDataURI, dataURItoByteString } from './utils';

describe('isDataURI()', () => {
  it.each`
    input                                            | expectedResult
    ${'potato'}                                      | ${false}
    ${'data:,Hello%2C%20world%21'}                   | ${true}
    ${'data:text/plain;base64,SGVsbG8sIHdvcmxkIQ=='} | ${true}
  `('returns $expectedResult given $input', ({ input, expectedResult }) => {
    const result = isDataURI(input);

    expect(result).toBe(expectedResult);
  });
});

describe('dataURItoByteString()', () => {
  it('throws given invalid data URI', () => {
    expect(() => dataURItoByteString('potato')).toThrow();
  });

  it('returns a byte string given plain text data URI', () => {
    const result = dataURItoByteString('data:,Hello%2C%20world%21');

    expect(result).toBe('Hello, world!');
  });

  it('returns a byte string given base64 data URI', () => {
    const result = dataURItoByteString('data:text/plain;base64,SGVsbG8sIHdvcmxkIQ==');

    expect(result).toBe('Hello, world!');
  });

  it('returns a byte string given base64 PDF data URI', () => {
    const result = dataURItoByteString(
      'data:application/pdf;base64,JVBERi0xLg10cmFpbGVyPDwvUm9vdDw8L1BhZ2VzPDwvS2lkc1s8PC9NZWRpYUJveFswIDAgMyAzXT4+XT4+Pj4+Pg==',
    );

    expect(result).toBe('%PDF-1.\rtrailer<</Root<</Pages<</Kids[<</MediaBox[0 0 3 3]>>]>>>>>>');
  });

  it('returns a byte string given base64 PDF data URI with filename', () => {
    const result = dataURItoByteString(
      'data:application/pdf;filename=generated.pdf;base64,JVBERi0xLg10cmFpbGVyPDwvUm9vdDw8L1BhZ2VzPDwvS2lkc1s8PC9NZWRpYUJveFswIDAgMyAzXT4+XT4+Pj4+Pg==',
    );

    expect(result).toBe('%PDF-1.\rtrailer<</Root<</Pages<</Kids[<</MediaBox[0 0 3 3]>>]>>>>>>');
  });
});