CF

C# Unit Testing Essentials

2h 35m 23s
English
Paid
Updated September 2026

C# Unit Testing Essentials is a 44-lesson 2 hours 35 minutes self-paced course by Julio Casal. C# Unit Testing Essentials is taught by Julio Casal, a Microsoft software engineer who has written thousands of unit tests across production C# applications.

Course facts

Lessons
44
Duration
2 hours 35 minutes
Level
All levels
Language
English
Updated
2026-09-11
Instructor
Julio Casal
Price
Premium

C# Unit Testing Essentials is taught by Julio Casal, a Microsoft software engineer who has written thousands of unit tests across production C# applications.

Starting From the Fundamentals

The course builds up step by step from what unit testing actually is and why it matters, rather than assuming you already know the vocabulary.

What You'll Learn

  • The fundamentals of unit testing in C#, from first principles
  • The modern tools and libraries .NET developers currently use for testing
  • How to apply testing concepts to real-world scenarios, not just toy examples

Across 44 lessons, the aim is confidence: finishing able to write and structure your own tests rather than just recognizing what a test looks like.

Key Features of the Course:

  • Foundation in Unit Testing: You will learn the fundamentals of unit testing in C#, starting from the basics and advancing step by step.
  • Expert Guidance: Julio Casal's extensive experience, particularly in writing unit tests for C# applications, offers valuable insights and practical knowledge.
  • Focus on Modern Tools and Libraries: The course covers the latest and most popular tools and libraries used by .NET developers today for unit testing, ensuring that learners are up-to-date with current industry standards.
  • Building Confidence in Writing Tests: By the end of the course, you will not only understand the importance of unit testing but also gain confidence in writing your tests effectively.
  • Practical and Hands-on Approach: The course promises a practical approach, allowing learners to apply their knowledge to real-world scenarios and build a strong foundation in unit testing.


Who teaches C# Unit Testing Essentials? Julio Casal

Julio Casal thumbnail

Julio Casal is a US software engineer and one of the more active independent .NET / C# educators publishing course material on the modern .NET stack. His courses focus on the production-engineering side of .NET microservices and the cloud-native patterns that show up in real .NET applications running on Azure and AWS.

The course catalog covers ASP.NET Core, .NET microservices with Docker and Kubernetes, Azure cloud deployment patterns, the testing tracks, and the broader cloud-native .NET work that separates Julio's material from generic .NET tutorial content. Course material is taught at the level of a working senior .NET engineer.

The CourseFlix listing under this source carries 9 Julio Casal courses spanning that range. Material is paid and aimed at intermediate-and-up .NET developers building production microservices and cloud-native applications.

What lessons are included in C# Unit Testing Essentials?

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#1: Course introduction
All Course Lessons (44)
#Lesson TitleDurationAccess
1
Course introduction Demo
00:37
2
Course outline
00:58
3
Is this course for you?
00:27
4
Software prerequisites
00:41
5
Introduction
00:24
6
What is automated testing?
03:52
7
Types of tests
03:10
8
What is unit testing?
03:47
9
Do I need unit tests?
05:37
10
How many tests should I have?
01:28
11
Introduction
00:25
12
Choosing a unit testing framework
01:49
13
Setting up VS Code for unit testing
02:12
14
Write your first unit test
09:19
15
Running your unit test
04:15
16
Debugging your unit test
02:29
17
Unit testing with Visual Studio
04:55
18
Introduction
00:21
19
Unit test naming
03:13
20
Using the AAA pattern
03:09
21
Testing all code paths
04:33
22
Catching a regression
02:52
23
Refactoring with confidence
02:23
24
Introduction
00:23
25
The xUnit test lifecycle
06:55
26
Getting test output
04:19
27
Writing parameterized tests
07:35
28
Ignoring tests
03:14
29
Testing internal methods
03:06
30
Introduction
00:25
31
Asserting numbers, strings and dates
07:31
32
Using FluentAssertions
07:13
33
Asserting objects
06:28
34
Asserting collections
03:11
35
Asserting exceptions
02:45
36
Asserting raised events
02:33
37
Introduction
00:33
38
The problem with dependencies
07:09
39
Refactoring towards loose coupling
04:12
40
Using test doubles
08:04
41
Stubs vs mocks
01:16
42
Stubbing with NSubstitute
04:00
43
Mocking with NSubstitute
05:29
44
Stubbing and Mocking with Moq
06:06
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Frequently asked questions

What are the prerequisites for taking this course?
Before enrolling in this course, you should have a basic understanding of C# programming. Familiarity with Visual Studio Code or Visual Studio is recommended, as the course includes lessons on setting up these environments for unit testing. The 'Software prerequisites' lesson provides additional details about the necessary software tools.
What will I build or accomplish by the end of this course?
By the end of the course, you will be able to write, run, and debug unit tests for C# applications. You'll learn to use frameworks like xUnit and tools such as NSubstitute and Moq for stubbing and mocking. The course covers building unit tests that assert numbers, strings, collections, exceptions, and events, ensuring robust testing coverage for your applications.
Who is the target audience for this course?
This course is designed for C# developers who want to improve their skills in writing unit tests. It's suitable for both beginners who are new to automated testing and experienced developers looking to refine their testing practices. The lesson 'Is this course for you?' provides more insights into who will benefit most.
How does this course compare in depth and scope to similar courses?
The course offers a comprehensive guide to unit testing in C#, covering everything from basic to advanced topics. With 44 lessons, it goes beyond introductory concepts to include advanced techniques like parameterized tests, testing internal methods, and using test doubles. It provides a thorough exploration of unit testing frameworks and tools, which might be more detailed than shorter courses.
Which specific tools and platforms are covered in this course?
The course covers key tools and platforms for unit testing in C#. This includes setting up and using Visual Studio Code and Visual Studio, selecting a unit testing framework, and employing tools like xUnit, NSubstitute, and Moq for various testing scenarios, including stubbing and mocking.
What topics are not covered in this course?
The course does not cover topics related to integration testing or end-to-end testing. It focuses exclusively on unit testing within C# applications, emphasizing writing and managing tests at the unit level. For those interested in broader testing methodologies, additional courses would be necessary.
What is the expected time commitment for this course?
The course consists of 44 lessons, but the total runtime and recommended study time are not specified. Typically, such a course might require a commitment of several hours per week over a few weeks, depending on your prior experience with C# and unit testing concepts.