Testing an Angular Controller that incorporates Kendo Grid and Datasource functionality

Currently, my project is utilizing AngularJS along with Kendo-UI. I am facing an issue while attempting to test one of my Controllers that incorporates a Kendo-UI Grid:

angular.module('myApp')('DevicesCtrl', function ($scope) {

    $scope.gridOptions = {
        dataSource: {
            transport: {
                read: {
                    url: "/devices",
                    dataType: "json"
                }
            },
            change: function(){
                var view = this.view();
                $scope.devices = [];

                $.each(view, function(i, v) {
                    $scope.devices.push({id: v.id, description: v.name, status: v.status  == 0 ? "failure" : "success"});
                });
                $scope.$apply();
            }
        },
        columns: [
            {
                field: "name",
                title: "Name",
                width: 250,
                template: function (item) {
                    var itemStatus = item.status == 0 ? 'failure' : 'success';
                    return '<div label size="small" operation="' + itemStatus + '" label="' + item.name + '"></div>';
                }
            },
            {
                field: "status",
                title: "Status"
            }
        ]
    };
});

While creating my unit test, I had expected a GET request to be triggered:

describe('deviceCtrl', function () {

    var scope, deviceCtrl, httpBackend, timeout;

    beforeEach(module("myApp"));
    beforeEach(module('src/modules/devices/views/device.html'));

    beforeEach(inject(function ($controller, $rootScope, $httpBackend, $timeout, $state) {
        scope = $rootScope.$new();

        httpBackend = $httpBackend;
        timeout = $timeout;

        httpBackend.expectGET('languages/en_US.json').respond({});

        deviceCtrl = $controller("DeviceCtrl", {
            $scope: scope
        });

        $state.go("devices");
        timeout.flush()

    }));

    it('should load the switch list', function () {

        httpBackend.expectGET("/devices").respond(
            [{"id":"1","name":"name 1","status":"1"},
            {"id":"2","name":"name 2","status":"2"}]
        );

        httpBackend.flush();

    });

});

However, I found that the anticipated expectation was not met as no requests were initiated. Hence, my query pertains to whether there exists a method to compel Kendo Grid/Datasource to make this call, allowing me to simulate it?

In my research, I stumbled upon some instances illustrating how Mockjax could achieve this (http://www.telerik.com/forums/best-practice-mocking-with-datasource). Nevertheless, I would prefer to explore utilizing angular libraries for this purpose.

Answer №1

After conducting extensive research, I have discovered effective methods for testing Controllers that utilize Kendo Datasource.

Kendo's unique way of handling Ajax calls to retrieve data can pose a challenge when using traditional Angular $http methods for testing with tools like angular-mocks. Let's explore the available options:

1 – Utilize standard Angular approaches for Ajax calls.

By modifying how Kendo fetches data, instead of the usual method shown below:

dataSource: new kendo.data.DataSource({
            transport: {
                read: {
                    url: "/devices",
                    dataType: "json"
                }
            },
            change: function(){
                var view = this.view();
                $scope.devices = [];

                $.each(view, function(i, v) {
                    $scope.devices.push({id: v.id, description: v.name, status: v.status == 0 ? "failure" : "success"});
                });
                $scope.$apply();
            }
});

We would adjust it to:

dataSource: new kendo.data.DataSource({
            transport: {
                read: function(options){
                    $http.get("/devices").then(function(response){
                        options.success(response.data);
                        $scope.devices = [];
                        response.data.forEach(function(v){
                            $scope.devices.push({id: v.id, description: v.name, status: v.status == 0 ? "failure" : "success"});
                        });
                    });
                }
            }
});

This modification allows us to utilize standard $httpBackend.expectGET(url) for mocking the Ajax call. Personally, I find this method beneficial as it provides more control over testing processes. P.S.: By utilizing the variable “options” within the function, we can access Grid filter, sorting, and paging values.

2 – Simulate the Kendo Ajax Call.

In this approach, minimal changes are required in the Controller. The only adjustment needed is to instantiate a new Datasource using new kendo.data.DataSource({}) instead of directly passing the options object. This adjustment is necessary because we invoke the read function during testing. I experimented with various methods for mocking this Ajax request, and the most successful one was employing a tool called Jasmine-Ajax. In the test case, the code snippet would look like:

var request = jasmine.Ajax.requests.mostRecent();
request.response(MockData);

I trust these insights will be valuable to others facing similar challenges.

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