Exploring jasmine testing with ajax requests

I've been working on writing Jasmine unit tests for a JavaScript file that includes an Ajax call. I'm unsure how to properly test the 'Success' function using Jasmine.

Here's a snippet of the code:

function getGroups(){
 var defer = _$q.defer();
  $.ajax( {
      url: 'xyz',
      data: 'abc',
      async: false,
      type: 'POST',
      dataType: 'xml',
      success: function( xml ) {
          var groups = [];
          groups = xml.getElementsByTagName( 'requiredGroup' );
          defer.resolve( groups );
      }
  } );
  return defer.promise;
}

I've attempted various solutions, but haven't been successful in covering the code within the success function:

 describe("getGroups() does ajax call", function() {
    beforeEach(function() {
      spyOn($, 'ajax');
    });

   it("should call the success function", function() {
   getGroups();
   expect($.ajax).toHaveBeenCalled();
});

});

Answer №1

Are you looking to test the ajax call itself or the success callback function? It's important to verify that both are functioning correctly.

If your focus is on testing the success callback, one approach is to extract it into a separate variable and test it individually:

function getGroups(){
 var defer = _$q.defer();
  $.ajax( {
      url: 'xyz',
      data: 'abc',
      async: false,
      type: 'POST',
      dataType: 'xml',
      success: function(xml) {
          onSuccess(xml, defer);
      }
  } );

  return defer.promise;
}

const onSuccess = function( xml, defer) {
       var groups = [];
       groups = xml.getElementsByTagName( 'requiredGroup' );
       defer.resolve( groups );
}

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