salix/back/methods/image/specs/download.spec.js

const {models} = require('vn-loopback/server/server');

describe('image download()', () => {
    const collection = 'user';
    const size = '160x160';
    const employeeId = 1;
    const ctx = {req: {accessToken: {userId: employeeId}}};

    it('should return the image content-type of the user', async() => {
        const userId = 9;
        const image = await models.Image.download(ctx, collection, size, userId);
        const contentType = image[1];

        expect(contentType).toEqual('image/png');
    });
});