@jsreport/node-signpdf/src/helpers/plainAddPlaceholder/createBufferPageWithAnnotation.test.js

Simple signing of PDFs in node.

import createBufferPageWithAnnotation from './createBufferPageWithAnnotation';
import findObject from './findObject';

jest.mock('./findObject', () => ({
    __esModule: true,
    default: jest.fn(),
}));

describe('createBufferPageWithAnnotation', () => {
    it('Adds annotation to an existing array', () => {
        findObject.mockImplementation(() => (
            '/Annots [1 0 R]\n/Something [ELSE HERE]'
        ));
        const info = {xref: {}};
        info.xref.offsets = new Map();
        info.xref.offsets.set(1, 1);
        const buffer = createBufferPageWithAnnotation(
            'pdf',
            info,
            '1 0 R',
            '2 0 R',
        );
        expect(buffer.toString().indexOf('/Annots [1 0 R 2 0 R]')).not.toBe(-1);
    });
    it('Adds annotation when one does not exist', () => {
        findObject.mockImplementation(() => (
            '/There /Is /Other [] /Stuff /But /No /xxAnnotsxx'
        ));
        const info = {xref: {}};
        info.xref.offsets = new Map();
        info.xref.offsets.set(1, 1);
        const buffer = createBufferPageWithAnnotation(
            'pdf',
            info,
            '1 0 R',
            '2 0 R',
        );
        const regex = /\/Annots\s+\[\s*2 0 R\s*\]/m;
        expect(regex.test(buffer.toString())).toBe(true);
    });
});