salix/back/methods/message/specs/send.spec.js

const app = require('vn-loopback/server/server');

describe('message send()', () => {
    it('should call the send method and return the response', async() => {
        let ctx = {req: {accessToken: {userId: 1}}};
        let params = {
            recipientFk: 1,
            message: 'I changed something'
        };
        let response = await app.models.Message.send(ctx, params, {transaction: 'You'});

        expect(response.message).toEqual(params.message);
    });
});