Mocking Ext.Ajax.request in ExtJS 4.2.1 is a process of em

When it comes to frontend unit testing using Jasmine, one of the challenges I faced was mocking all the requests in my application.

Luckily, I have already tackled a method to mock all my proxies successfully:

proxy: appname.classes.proxy.ProxyNegotiator.getModelProxy("User")

This method essentially determines the type of proxy based on configuration settings:

getModelProxy: function(config) {
    var url = this.getUrl(config);

    if (this.getProxyType() == 'api') {
        return appname.classes.proxy.WebApiProxy.getModelProxy(url);
    } else if (this.getProxyType() == 'test') {
        return appname.classes.proxy.LocalTestProxy.getModelProxy(url);
    }
    return undefined;
}

By configuring the ProxyType, I am able to seamlessly switch between web api proxy and local test proxy for CRUD operations.

However, another issue that arises is dealing with other types of requests in the application, such as validating usernames:

//check if Username is Valid
Ext.Ajax.request({
    url: '/api/User',
    method: 'GET',
    async: false,
    params: { id: user.get('Id'), username: user.get('UserName') },
    failure: function(response, opts) {
        myErrors.push({
            field: 'UserName',
            message: appname.locale.ErrorInvalidUsername
        });
    }
});

Unfortunately, I am struggling with mocking these Ext.Ajax.request calls. Despite searching extensively online, I haven't found a satisfactory solution yet. Any advice or ideas on best practices for mocking such requests would be highly appreciated. Please assist!

Answer №1

Starting with version 4.0.7, all versions of Ext JS come equipped with the Ext.ux.ajax.SimManager class. While it's not included in the base library builds, you can find the unminified source under examples/ux/ajax within your Ext JS folder.

Using this class involves registering a URL along with a Simlet configuration that specifies the return data.

Ext.onReady(function () {
    Ext.ux.ajax.SimManager.init({
        delay: 500  // Simulates network latency/server processing time
    }).register({
        '/api/User': {
            stype: 'json',  // stype is what kind of Simlet you want to use
            data:  [
                // JSON response data, if needed
            ]
        }
    });
});

Once this setup is complete, you can proceed to make Ajax requests as usual, and the SimManager will handle rerouting the request through the registered Simlet.

Answer №2

If you need to mock AJAX requests in your Ext heavy application, I recommend looking into sinon js. We have been using it for our unit tests and it works great. Check it out here: http://sinonjs.org/docs/#fakeServer

Here is an example of how you can test your ajax request with sinon:

{
    setUp: function () {
        this.server = sinon.fakeServer.create();
    },

    tearDown: function () {
        this.server.restore();
    },

    "test user" : function () {
        this.server.respondWith("GET", "/api/User",
                                [500, { "Content-Type": "application/json" },
                                 '[{ "id": 12, "comment": "Hey there" }]']);

        Ext.Ajax.request({
            url: '/api/User',
            method: 'GET',
            async: false,
            params: { id: user.get('Id'), username: user.get('UserName') },
            failure: function(response, opts) {
                myErrors.push({
                    field: 'UserName',
                    message: appname.locale.ErrorInvalidUsername
                });
            }
        });

        this.server.respond();

        //assert myErrors
    }
}

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