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Kevin Jones

This course will teach you how to use JUnit 5 to write unit tests for your Kotlin code.

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This course will teach you how to use JUnit 5 to write unit tests for your Kotlin code.

Junit 5 is the de-facto standard testing framework on the JVM. It is used to test application code in many areas including enterprise, desktop and mobile applications.

This class will show how to setup Junit to test Kotlin code, including the some of the issues you will encounter that are unique to Kotlin.

The class will also extend some of the features of Junit, for example by using an assertions library to extend the range and flexibility of the assertions that are available. Finally we will look at ‘mocking’, something that JUnit does not provide itself, for this we will use the MockK, a mocking framework written in and for Kotlin.

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What's inside

Syllabus

Course Overview
Writing Your First Test
Writing Better Tests with JUnit 5 and Kotlin
Parameterized Tests
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Writing Fluent Assertions with the Kluent Library in Kotlin
Writing Mocks with MockK
Testing Hard to Test Things

Good to know

Know what's good
, what to watch for
, and possible dealbreakers
Is highly aligned to what enterprise Kotlin developers need to know
Helps students learn more about JUnit 5 and its new features
Teaches how to write better tests with JUnit 5 and Kotlin
Shows how to mock in Kotlin, a feature that JUnit 5 does not provide itself
Taught by Kevin Jones, who is an experienced instructor in Kotlin
Requires students to be familiar with Kotlin to get the most out of the course

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Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in Kotlin Unit Testing with JUnit with these activities:
Review Basic Kotlin Concepts
This activity ensures you have a strong foundation in Kotlin before learning JUnit testing.
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Show steps
  • Review the Kotlin documentation
  • Run through a few basic Kotlin tutorials
  • Try solving some simple Kotlin coding challenges
Read 'JUnit Testing with Kotlin' by Nick Samoylov
Familiarize yourself with concepts covered in this course through reading about JUnit testing in Kotlin.
Show steps
  • Find and acquire a copy of the book.
  • Read the book thoroughly, taking notes as you go.
  • Reflect on the concepts you have learned.
Practice Writing Test Cases
This activity helps you sharpen your test writing skills, which is crucial for effective JUnit testing.
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  • Write test cases for a simple function
  • Try to break your own code by writing test cases that cover edge cases
  • Submit your test cases for feedback
22 other activities
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Review Basic Java Syntax
Refresh basic Java syntax to provide a foundation for learning Kotlin.
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  • Review data types, variables, and operators.
  • Practice writing simple Java programs.
JUnit and Kotlin Tutorial
Learn the basics of JUnit and how to use it to test your Kotlin code.
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  • Read the official JUnit documentation
  • Watch a tutorial on JUnit and Kotlin
  • Try out the examples in the tutorial
Create a JUnit 5 project in Kotlin
Starting a project will help you put the course content into practice immediately so that you can better master the fundamentals of code testing in Kotlin.
Show steps
  • Create a new Kotlin project
  • Add the JUnit 5 dependency
  • Write a simple test case
Follow External JUnit 5 Tutorials
Enhance your comprehension of JUnit 5 by exploring and completing external video or interactive tutorials.
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Show steps
  • Identify and curate high-quality JUnit 5 tutorials.
  • Follow the tutorials, taking notes and completing any exercises or assignments.
  • Apply what you've learned in the tutorials to your own Kotlin testing projects.
JUnit Testing Fundamentals Project
Develop a simple Java program to apply JUnit testing concepts.
Show steps
  • Design a Java class to test.
  • Write JUnit test cases for the Java class.
  • Run the JUnit tests and verify the results.
Join a JUnit 5 Study Group
Benefit from the collective knowledge and support of peers in a study group dedicated to JUnit 5.
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Show steps
  • Connect with other students taking this course or from online communities.
  • Schedule regular meetings to discuss course topics.
  • Share learnings, ask questions, and collaborate on practice exercises.
Follow a tutorial on Writing Mocks with MockK
MockK is an important tool for testing Kotlin code. This tutorial will help you get started with MockK and improve your understanding of its usage.
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Show steps
  • Find a tutorial on Writing Mocks with MockK
  • Follow the tutorial and complete the exercises
JUnit 5 Unit Test
Sharpen your understanding of JUnit 5 by completing several practice drills.
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Show steps
  • Set up a JUnit 5 testing environment in your Kotlin project.
  • Write a series of unit tests for a simple Kotlin function or class, covering various scenarios.
  • Assert the expected results of your unit tests.
  • Run the unit tests and analyze the results.
JUnit Parameterized Tests Exercises
Complete exercises to practice writing parameterized tests using JUnit.
Show steps
  • Solve exercises on writing parameterized tests for different scenarios.
  • Review solutions and identify areas for improvement.
JUnit 5 Unit Test Drills
Deepen your understanding of JUnit 5 through focused practice.
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Show steps
  • Access an online coding platform with unit testing drills.
  • Solve practice problems on JUnit 5 unit testing.
  • Review your answers and learn from your mistakes.
Write and run a variety of JUnit 5 tests
The best way to master writing JUnit 5 tests is through practice. This activity will provide you with opportunities to practice writing and running different types of JUnit 5 tests.
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Show steps
  • Create a new test class
  • Write a variety of test methods
  • Run the tests and check the results
Coding Katas
Improve your problem solving skills and practice writing efficient code.
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Show steps
  • Solve a kata for each section of the course
  • Try to solve a kata without looking at the solution
  • Submit your solution for feedback
JUnit Study Group
Meet with a group of fellow students to discuss JUnit and your experiences using it.
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Show steps
  • Find a group of students who are also taking the course
  • Meet regularly to discuss the course material
  • Work together on practice problems
Advanced JUnit Assertions with Kluent Tutorial
Extend the range of assertions using Kluent, enriching the testing capabilities.
Show steps
  • Follow a tutorial on using Kluent for advanced assertions.
  • Practice writing assertions using Kluent.
JUnit 5 Tutorial
Develop a comprehensive tutorial on JUnit 5, providing clear explanations and code examples.
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Show steps
  • Gather information and resources on JUnit 5.
  • Outline the tutorial, covering key concepts and examples.
  • Write the tutorial content, ensuring clarity and accuracy.
  • Edit and proofread the tutorial.
  • Publish or share the tutorial with others.
Read Clean Code
Understand the importance of writing high quality code that is maintainable and easy to read.
Show steps
  • Read the first three chapters
  • Implement one of the principles in your own code
  • Write a blog post or give a presentation about what you learned
JUnit Resources Collection
Gather resources on JUnit and Kotlin testing to help you learn and retain the material.
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Show steps
  • Create a document or spreadsheet to organize your resources
  • Add links to relevant tutorials, articles, and documentation
  • Share your collection with your fellow students
Kotlin and JUnit Blog Post
Write a blog post summarizing JUnit testing in Kotlin, reinforcing the concepts.
Show steps
  • Research and gather information about JUnit testing in Kotlin.
  • Draft the blog post, explaining the key concepts.
  • Review and edit the blog post for clarity and accuracy.
Learn Mockito with Step-by-Step Tutorials
Master the basics of Mockito, a popular mocking framework in Kotlin, through guided instructions.
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Show steps
  • Identify online resources that provide step-by-step Mockito tutorials.
  • Follow the tutorials, performing the steps and examples provided.
  • Experiment with the concepts learned by applying them to your own test cases.
JUnit Testing Project
Build a project that uses JUnit to test your code.
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Show steps
  • Create a new Java project
  • Add JUnit to your project
  • Write unit tests for a simple function
  • Run your tests and fix any errors
  • Test-drive the development of a new feature
Develop a Personal Project Using JUnit 5
Apply your JUnit 5 skills by building a personal project that incorporates unit testing.
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Show steps
  • Brainstorm and choose a project idea that aligns with your interests and this course.
  • Design and implement the project, ensuring to incorporate unit tests using JUnit 5.
  • Test the project thoroughly, making revisions as needed.
  • Document your project and share it with others.
Create a JUnit 5 Unit Testing Tutorial
Consolidate your understanding of JUnit 5 by creating a tutorial that explains its concepts and usage.
Browse courses on JUnit 5
Show steps
  • Identify and research the key concepts of JUnit 5.
  • Develop a clear and concise outline for your tutorial.
  • Write the tutorial, providing examples and explanations.
  • Review and edit your tutorial for clarity and accuracy.
  • Share your tutorial with others to help them learn about JUnit 5.

Career center

Learners who complete Kotlin Unit Testing with JUnit will develop knowledge and skills that may be useful to these careers:
Software Engineer
Software Engineers write code and design software. A background in JUnit and the skills to write automated tests are essential for a successful career in this space. This course will teach you automated testing with JUnit 5 and Kotlin. While many programming languages use JUnit, the experience you gain from this course will help you stand out in the Kotlin ecosystem.
Test Engineer
Test Engineers play a vital role in creating quality software. In this job, you are responsible for analyzing, reviewing, documenting and testing software to ensure that it meets customer/product requirements. This course in JUnit and automated testing will give you a leg up in this career.
Quality Assurance (QA) Analyst
A Quality Assurance (QA) Analyst is responsible for the quality of a software product. They analyze, review, document and test software to ensure that it meets customer/product requirements. This course on JUnit will help you get the skills you need to succeed in this role, particularly in modern software development.
Software Developer
Software Developers work on the design, coding and testing of software. This course covers all of the testing aspect of being a Software Developer and it will help you stand out as a candidate for roles in the Kotlin ecosystem.
Mobile Application Developer
Mobile Application Developers write code for mobile applications. An understanding of JUnit and automated testing is essential for success in this fast-paced environment. This course will put you ahead of the curve.
Full-Stack Developer
Full Stack Developers have expertise in both front-end and back-end development. JUnit is used on both sides of the stack so a course on writing tests in JUnit will open up more career opportunities for you.
Application Architect
Application Architects design, create and maintain the software architecture of an application. This course covers the design of automated tests which is an important skill for an Application Architect to have.
Web Developer
Web Developers design, code, and maintain websites. Automated testing with JUnit is now an essential skill for Web Developers and having a background in this will make you stand out in this role.
Data Analyst
Data Analysts collect, clean, and analyze large datasets to find trends and patterns. This course may help you as you will learn techniques for analyzing and testing data.
Business Analyst
Business Analysts analyze an organization's business processes and make recommendations for improvements. This course in automated testing may help as you can apply these techniques to business processes you analyze.
Project Manager
Project Managers plan and execute projects. This course may aid you as it will give you the skills to analyze and test business processes which is a core Project Management skill.
Product Manager
Product Managers manage the development and launch of new products. This course in automated testing may help as you learn techniques to analyze and test product features.
Scrum Master
Scrum Masters facilitate Agile development teams. This course may or may not help you as the subject matter is disjoint but the experience of learning JUnit will be helpful.
Database Administrator
Database Administrators manage and maintain databases. This course is disjoint, but the experience of learning JUnit will be helpful.
Network Engineer
Network Engineers design, implement, and maintain computer networks. This course is disjoint, but the experience of learning JUnit will be helpful.

Reading list

We've selected seven books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in Kotlin Unit Testing with JUnit.
Collection of best practices and design patterns for Kotlin. It covers a wide range of topics, from basic syntax to advanced features such as concurrency and functional programming.
Provides a comprehensive overview of the Kotlin programming language. It covers all the basics of Kotlin, as well as more advanced topics such as concurrency and functional programming.
Practical guide to Kotlin for Java developers. It covers all the basics of Kotlin, as well as more advanced topics such as object-oriented programming and functional programming.
Classic guide to unit testing. It covers the principles of unit testing, as well as practical advice on how to write effective unit tests.
Beginner-friendly guide to Kotlin. It covers the basics of Kotlin, as well as more advanced topics such as object-oriented programming and functional programming.
Practical guide to using Kotlin for Android development. It covers all the basics of Kotlin, as well as more advanced topics such as Android-specific features and best practices.

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