Chrome-Extensions Jasmine Testing, Chrome,onMessage request methods not Identified

So I've written a small chrome extension that gets my selection in chrome and adds it to a small textbox in a popup window.

For that Chrome Extension I want to write some small tests using Jasmine. However, whenever I try to test my Message request.method to be a set request.method, Jasmine always returns Error: Expected undefined to be 'get_sel_chrome. This might seem very minor but I just cant find the thing I am doing wrong.

Here are my Files:

//Jasmine Main Specification File

//Creating Suite
describe("Lacy-R Functionality Requirement Min Tests: ", function(){

//telling Jasmine to make sure that these are setup before each tests
beforeEach(function(){
      chrome = {
        extension: {
          onMessage: {
            addListener: function(request, sender, sendResponse){}
          }
        }
      }

});

 it('Check if Jasmine is loading. Just a small basic Jasmine test', function(){
     expect(1).toEqual(1);
    });


it('Checks if the request method is get_sel_chrome' , function(){
    expect(chrome.extension.onMessage.addListener(function(request, sender, sendResponse){request.method})).toBe("undefined");
});

it('Using Chrome API functions' , function(){

});
});

My main JS file:

//stuff chrome does
chrome.extension.onMessage.addListener(function(request, sender, sendResponse){

    if (request.method = "get_sel_chrome"){

    sendResponse({data: window.getSelection().toString()});
}

    else{
    sendResponse({});} //empty response
});

Second File

$(function(){
  $('#btn_run').click(function(){get_Info();});
});

function get_Info() {
  chrome.tabs.query({active:true, windowId: chrome.windows.WINDOW_ID_CURRENT}, 

  function(tab) {
    chrome.tabs.sendMessage(tab[0].id, {method: "get_sel_chrome"}, 

    function(response){
      var text = document.getElementById('text'); 
      text.innerHTML = response.data;

    });
  });
}