Book Image

Kotlin Blueprints

By : Ashish Belagali, Akshay Chordiya, Hardik Trivedi
Book Image

Kotlin Blueprints

By: Ashish Belagali, Akshay Chordiya, Hardik Trivedi

Overview of this book

Kotlin is a powerful language that has applications in a wide variety of fields. It is a concise, safe, interoperable, and tool-friendly language. The Android team has also announced first-class support for Kotlin, which is an added boost to the language. Kotlin’s growth is fueled through carefully designed business and technology benefits. The collection of projects demonstrates the versatility of the language and enables you to build standalone applications on your own. You’ll build comprehensive applications using the various features of Kotlin. Scale, performance, and high availability lie at the heart of the projects, and the lessons learned throughout this book. You’ll learn how to build a social media aggregator app that will help you efficiently track various feeds, develop a geospatial webservice with Kotlin and Spring Boot, build responsive web applications with Kotlin, build a REST API for a news feed reader, and build a server-side chat application with Kotlin. It also covers the various libraries and frameworks used in the projects. Through the course of building applications, you’ll not only get to grips with the various features of Kotlin, but you’ll also discover how to design and prototype professional-grade applications.
Table of Contents (16 chapters)
Title Page
About the Authors
About the Reviewer
Customer Feedback


Our news feed application is ready, but it's not production ready until it is tested.

Adding Gradle dependency

We need to add JUnit and Ktor dependencies in the build.gradle file to test the application:

    // Testing
    testCompile group: 'junit', name: 'junit', version: '4.12'
    testCompile "io.ktor:ktor-server-test-host:$ktor_version"

Testing the application

We have three URL endpoints in our application, two of which return JSON data for which we will use an external tool named Postman to test them.

Testing the index URL

The preceding test case gets an instance of our application and sends a get request on the specified URL, which in this is /, aka an index URL, and it checks if the status is OK - 200 and content is Hello readers!:

    class ApplicationTest {
      fun `check index page`() = withTestApplication(Application::main)  
        with(handleRequest(HttpMethod.Get, "/")) {
          assertEquals(HttpStatusCode.OK, response.status())