asyncTestingMocha

function serverRespondGet(server, api, data){
    server.respondWith( "GET", api, [200, {
            "Content-Type": "application/json",
            "Access-Control-Allow-Headers":"Origin, X-Requested-With, Content-Type, Accept",
            "Access-Control-Allow-Methods" : "POST, GET, PUT, DELETE, OPTIONS",
            "Access-Control-Allow-Origin" : "*"
        }, JSON.stringify(data)]
    );

}

describe('....', function (){
    'use strict';


    beforeEach(function(){
        server = sinon.fakeServer.create();
        server.autorespond = true;
        server.respondImmediately = true;
    });

    afterEach( () => {
        server = null;
    } );

    it('fetches data from api', function (done) {

        setTimeout(done, 1000);
        serverRespondGet( server, 'endpoint', "some response");

        window.setTimeout(function(){
            server.respond();
        }, 5000);

        axios.get('endpoint').then((r)=>{
            // do stuff
        }).catch((e) => {
            // handle error
        });


    })
});