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Learn Unit Testing with NUnit and C#

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  • 4½ hours
  • 54 lessons
  • 1 quiz

Certificate of Completion Offered

Build a solid foundation in Unit Testing with this course 

This course is all about writing effective unit tests using C# programming language and NUnit as a unit testing framework. Along the way, we will learn the concepts related to unit testing. Today unit testing is an absolutely required skill from any professional developer. Companies expect from developers to know how to write unit tests including all the most important topics such as mocking and test driven development (TDD in short). This course does not cover all the features of NUnit. This course is way more interesting.

Learning unit testing puts a powerful and very usefu

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What You'll Learn In This Course

Write Unit Tests
Write Manual Mocks
Practice TDD
Best Practices of Unit Testing
Run and Debug Unit Tests
Learn Mocking Framework

What You Need For This Course

You should already be familiar with the basics of CSharp

Description

Build a solid foundation in Unit Testing with this course 

This course is all about writing effective unit tests using C# programming language and NUnit as a unit testing framework. Along the way, we will learn the concepts related to unit testing. Today unit testing is an absolutely required skill from any professional developer. Companies expect from developers to know how to write unit tests including all the most important topics such as mocking and test driven development (TDD in short). This course does not cover all the features of NUnit. This course is way more interesting.

Learning unit testing puts a powerful and very useful tool at your fingertips. Being familiar with unit testing you can write reliable and maintainable applications. It is very hard to lead a project which is not covered by unit tests. 

Content and Overview

This course is primarily aimed at beginner developers. It provides solid theoretical base reinforced by tons of practical material.

We start with basics of unit testing. What is a unit test? What unit testing frameworks exist? How to run and debug unit tests. After getting acquainted with the basics, we will get to the NUnit framework. Here you’ll learn how to install the framework, set the runner. Then you’ll learn the basics of assertions and arrange-act-assert triplet. Other key features of NUnit are also covered:

  • Running tests from the console 
  • Setup and teardown unit tests 
  • Parameterized tests 
  • Grouping and ignoring 

Practicing writing of unit tests, it’s impossible to avoid applying mocks. I like the word “test double” more, in general. By the way, you’ll learn what the difference between the following notion is:

  • Test double 
  • Fake 
  • Dummy 
  • Stub 
  • Mock 

You’ll learn how to write test doubles manually. You will also see a simple example of how to use a mocking framework for using mocks. I’ll use NSubstitute mocking framework for demonstration.

At the end of this section, you’ll get acquainted with two key approaches to unit testing, Classic or Detroit School and London School of unit testing. 

You’ll separately learn the basic of test-driven development. It is hard to imagine a modern professional developer who doesn’t know about TDD, so you’ll learn what it is and what it is about. You’ll see the Red-Green-Refactor triplet in action.

I could not complete the course avoiding the best practices of writing unit tests. You’ll learn the basic concepts of the modern approach to unit testing called “pragmatic unit testing”. You’ll see what problems static classes and singletons bring regarding the unit testing. They make code harder to unit test. After that, you’ll learn the problem of extracting interfaces just for the sake of introducing shims for injecting dependencies. 

You’ll know should you write unit tests for the trivial code. You’ll learn a lot more in the course.

So, in short, the course covers the following topics:

  • Basic notions of Unit Testing 
  • NUnit and its basic features 
  • Test Doubles including fakes, dummies, stubs, spies, and mocks 
  • How to write manual test doubles and how to use a mocking framework 
  • TDD, red-green-refactor triplet 
  • A great number of best practices of writing unit tests 

In the end, we will recap what you have learned, and you will try to understand where you have to go further with the intention to master your skills.

How long is this course: The course is around 4 hours. All are video lectures. You will be able to download all the slides and code samples used in the course. 

Syllabus

All the lessons in this course
  • Getting Started
  • How to Ask Questions
  • Download Source Code and Slides
  • Outline 00:58
  • What is a Unit Test? 03:11
  • Unit-Testing Frameworks 03:25
  • Your First Unit Test 08:43
  • Naming Conventions 04:34
  • Running and Debugging Unit Tests 05:02
  • Benefits of Unit Testing 03:35
  • Who Should Write Unit Tests and When 02:51
  • Programmer's Oath 03:29
  • Conclusion 01:15
  • NUnit Framework
  • Outline 01:06
  • Assert Introduction 05:30
  • Assert Demo 10:27
  • Arrange-Act-Assert 01:01
  • Running Tests from the Console 01:51
  • SetUp and TearDown 04:51
  • OneTimeSetUp and OneTimeTearDown 02:14
  • Prameterized Unit Tests 03:12
  • Grouping and Ignoring Unit Tests 02:14
  • Code Coverage 01:42
  • Conclusion 01:38
  • Test Doubles
  • Outline 01:09
  • Demo of a Testing Problem 03:44
  • Refactoring to Make Code Testable 04:20
  • Test Doubles 05:56
  • Hand Rolled or Manual Test Doubles 11:54
  • Problems with Manual Test Doubles 01:17
  • Mocking Frameworks 07:46
  • Writing Unit Tests with a Mocking Framework 07:46
  • NSubstitute Mocking Framework. Key Features. Demo 18:07
  • Detroit School vs London School of Unit Testing 02:23
  • Conclusion 01:18
  • Test-Driven Development
  • Outline 00:41
  • What is TDD? 05:00
  • Red \ Green \ Refactor 04:16
  • TDD and Design Upfront 02:36
  • TDD Demo 40:22
  • Conclusion 00:34
  • Best Practices of Unit Testing
  • Outline 00:55
  • Do Unit Tests Guarantee the Success? 02:26
  • Pragmatic Unit Testing 05:16
  • Integration Tests 04:18
  • Singletons and Static Classes 07:03
  • Header Interfaces 05:56
  • Demo of Refactoring to a Testable Design 14:29
  • How Much Test Coverage is Enough? 02:37
  • Testing Trivial Code 02:59
  • The Rule of Testing a Single Concern 03:06
  • More on Best Practices 10:19
  • Generating Unit Test Method Signatures 01:26
  • Conclusion 02:32
  • Final Quiz 4 questions