By Jim Lavin
Layout, construct, and attempt providers to create a origin in your AngularJS applications
About This Book
Understand how companies are an essential part of the AngularJS framework and the way leveraging companies can gain your applicationDesign and constitution your AngularJS prone and study the easiest practices utilized in designing AngularJS servicesEffectively write, attempt, and eventually installation your application
Who This publication Is For
What you'll Learn
Write Jasmine situations to check your AngularJS services
Implement universal performance that may be leveraged via the controllers, directives, and different prone on your application
Build providers that create, retrieve, replace, and delete your application's facts on exterior servers
Move company common sense to the customer part to construct a brand new classification of serverless applications
Optimize your AngularJS software for max performance
This publication provide you with the talents and top practices had to create AngularJS prone. It begins with the basics of what prone are and their position in a standard AngularJS program. you'll stroll throughout the improvement of a real-world program utilizing companies around the quite a few software layers after which circulate directly to create providers that offer cross-cutting issues comparable to messaging, logging, and authentication.
Next, the ebook covers providers that supply info entry displaying you ways to engage with exterior cloud-based information companies and the way to cache information at the purchaser to minimize community latency. The publication then indicates you the way to write down companies that leverage different cloud-based companies to create mashups and comprise performance on your program with no writing loads of code.
You also will methods to create enterprise good judgment gadgets, principles engines, and finite country machines, which are used to supply company common sense to your software.
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Extra resources for AngularJS Services
In the example scenario, we check to see if the checkUser method of the service calls the retrieveUser method of the data_service. To do this, we use Jasmine's spyOn() method, which intercepts the call to the retrieveUser method and tracks how many times the method is called. We also need to tell Jasmine what to do after it intercepts the call. We can either have it return a value, call a different function, or call through to the original implementation. In our case, we'll just have it call through to the original implementation of our mock service.
We can either have it return a value, call a different function, or call through to the original implementation. In our case, we'll just have it call through to the original implementation of our mock service. Next, we call the checkUser method on the service. This should invoke our mock service that, in turn, creates the deferred object, stores the deferred object, and returns the promise to the service, which then waits for the promise to be resolved. resolve(), and as we are outside the AngularJS world, we have to call the digest() method on rootScope to have AngularJS invoke the then() clause in our service.
Once this happens, the code in the then() clause of our service will be executed, and we can execute our assertions to make sure that the code performed as we expected it to. In this case, we check to see if the retrieveUser method of the service was called. resolve(). As you've seen, writing unit tests for service methods that have code that handles promises is a bit more complicated, as you have to manage creating the promise and resolving it, but it becomes straightforward after a few tests.
AngularJS Services by Jim Lavin