how to set res.body in chai-http code example

Example: get chai.request()

it('fails, as expected', function(done) { // <= Pass in done callback
  chai.request('http://localhost:8080')
  .get('/')
  .end(function(err, res) {
    expect(res).to.have.status(123);
    done();                               // <= Call done to signal callback end
  });
});

it('succeeds silently!', function() {   // <= No done callback
  chai.request('http://localhost:8080')
  .get('/')
  .end(function(err, res) {
    expect(res).to.have.status(123);    // <= Test completes before this runs
  });
});