Book Image

Learning Angular for .NET Developers

By : Rajesh Gunasundaram
Book Image

Learning Angular for .NET Developers

By: Rajesh Gunasundaram

Overview of this book

Are you are looking for a better, more efficient, and more powerful way of building front-end web applications? Well, look no further, you have come to the right place! This book comprehensively integrates Angular version 4 into your tool belt, then runs you through all the new options you now have on hand for your web apps without bogging you down. The frameworks, tools, and libraries mentioned here will make your work productive and minimize the friction usually associated with building server-side web applications. Starting off with building blocks of Angular version 4, we gradually move into integrating TypeScript and ES6. You will get confident in building single page applications and using Angular for prototyping components. You will then move on to building web services and full-stack web application using ASP.NET WebAPI. Finally, you will learn the development process focused on rapid delivery and testability for all application layers.
Table of Contents (16 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface

Unit testing a mock service


Keeping the components lean by injecting the services into it enables us to write unit tests with a mock service. We can mock the injected service by mimicking the service behavior using its interface:

class MockTodoService extends TodoService   {   
    getPending() {   
        return [];   
    }   
}      

Here, we created a mock of an existing todo service by extending and overriding the getPending method to return an empty array.

We can test this using testBed, instructing how to use the mock service, MockTodoService instead of the actual service, TodoService, as follows:

beforeEach(async(() => {   
      TestBed.configureTestingModule({   
        providers: [   
        {   
            provide: TodoService,   
            useClass:   MockTodoService   
        }   
    ]})   
    .compileComponents();   
}));   

Here, we instructed how to use MockTodoService instead of TodoService, and we can sky the outcome of testing, as follows:

it('should return empty...