Spec testing XMLHttpRequests javascript jasmine

Trying to write a test for our XmlhttpRequests I am trying to test the following

 getMove(){
    var image = 'placeholder'
    let url = `http://localhost:8000/pong/bot?&bally=${Math.round(this.ball.position.y)}&paddley=${this.players[1].position.y}&reward=${this.aggregateReward}&img=${image}`
    var that = this
    var xmlhttp = new XMLHttpRequest()
    xmlhttp.onreadystatechange = function() {
      if (this.readyState == 4 && this.status == 200) {
        var myArr = JSON.parse(this.responseText);
        that._move = myArr['up'];
        that.botUpdate(that._move);
        that.responseReceived = true;
      }
    };
    xmlhttp.open('GET', url, true);

    xmlhttp.send();

  }

Trying to mock the request so (is this the correct idea?) I wrote this test for it

describe("getMove", function() {
   it("should communicate data with XHR request", function() {

    var xhr = {

       open: jasmine.createSpy('open')
   };

   XMLHttpRequest = jasmine.createSpy('XMLHttpRequest');
   XMLHttpRequest.and.callFake(function () {
       return xhr;

   });

   submit();

   expect(xhr.open).toHaveBeenCalled(); 
    })
  })

However I get a submit is not defined, am confused as to whats happening here