CF

Mastering C# Unit Testing

3h 59m 22s
English
Paid
Updated September 2026

Mastering C# Unit Testing is a 44-lesson 3 hours 59 minutes self-paced course by Julio Casal. Mastering C# Unit Testing teaches testing by studying real code side by side — what makes a test reliable, and what quietly makes one fail under pressure.

Course facts

Lessons
44
Duration
3 hours 59 minutes
Level
All levels
Language
English
Updated
2026-09-11
Instructor
Julio Casal
Price
Premium

Mastering C# Unit Testing teaches testing by studying real code side by side — what makes a test reliable, and what quietly makes one fail under pressure.

Good Tests vs. Bad Tests

Instead of starting from testing theory, the course compares tests that hold up against ones that don't, showing why some tests break constantly and how to fix the underlying habits that cause it.

What You'll Practice

  • Naming, structuring, and scoping tests so they stay easy to read and trust
  • Working with test runners, mocks, and behavior-checking tools
  • Writing tests against real C# code — files, services, and other common app pieces, not toy samples

Drawing on patterns from years of fixing tests in production apps, the course's 44 lessons focus on plain, repeatable rules rather than guesswork.

Who teaches Mastering C# Unit Testing? 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 Mastering C# Unit Testing?

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#1: Course introduction
All Course Lessons (44)
#Lesson TitleDurationAccess
1
Course introduction Demo
00:39
2
Course outline
01:03
3
Is this course for you?
00:42
4
Software prerequisites
00:49
5
Setting up VS Code for unit testing
02:06
6
Introduction
00:32
7
Avoid testing implementation details
06:04
8
Use fakes wisely
09:34
9
Avoid multiple AAA sections
03:31
10
Avoid logic in tests
04:41
11
Reusing test fixtures
07:29
12
Working with time
07:08
13
Testing private methods
07:14
14
Introduction
00:23
15
Choosing what to test
02:59
16
The ASP.NET Core API you will unit test
12:18
17
Refactoring overcomplicated code – Take 1
06:30
18
Refactoring overcomplicated code – Take 2
06:31
19
Refactoring overcomplicated code – Take 3
07:10
20
Introduction
00:26
21
Testing entities
11:42
22
Testing application services
12:09
23
Testing error mapping logic
07:34
24
Testing data repositories
02:30
25
Testing controllers
08:21
26
Testing minimal APIs
08:49
27
Introduction
00:28
28
What is code coverage?
01:32
29
Using code coverage in VS Code
10:54
30
Using code coverage in Visual Studio
03:00
31
What’s the ideal code coverage number?
02:12
32
Configuring what to include in code coverage
06:55
33
Increasing the coverage
04:55
34
Introduction
00:25
35
Running tests in parallel
04:10
36
Using AutoFixture
08:03
37
Using live unit testing
06:24
38
Unit testing with ChatGPT
12:49
39
Introduction
00:22
40
Clean architecture quick recap
03:01
41
The application to test
13:34
42
What should you test?
03:03
43
Unit testing the application
13:19
44
Running code coverage
05:22
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Frequently asked questions

What are the prerequisites for enrolling in this course?
To enroll in this course, you should have a basic understanding of C# programming. Familiarity with Visual Studio Code or Visual Studio is helpful but not required, as the course will guide you through setting up VS Code for unit testing. The course does not cover introductory C# programming, so prior experience working with C# code is necessary.
What types of projects will I work on during the course?
The course involves writing tests for real C# code, focusing on practical application rather than toy examples. You will work on projects involving files, services, and app components, such as testing ASP.NET Core APIs, application services, and data repositories. This hands-on approach helps you understand how to apply unit testing in real-world scenarios.
Who is the target audience for this course?
This course is designed for C# developers who want to improve their unit testing skills. It is suitable for those who already have experience in C# programming and are looking to write more reliable and maintainable tests. The course is ideal for developers aiming to enhance their testing practices in production environments.
How does the depth of this course compare to other C# testing courses?
Unlike some introductory testing courses, this course delves into advanced topics such as avoiding common testing mistakes, using fakes wisely, and testing private methods. It also covers the use of specific tools like test runners and mocks, providing detailed guidance on when and how to use them effectively. The course emphasizes real-world applications and best practices developed from years of experience.
What specific tools and platforms will I learn to use?
You will learn to work with common C# testing tools, including test runners and mocks. The course also covers the use of code coverage tools in VS Code and Visual Studio, helping you understand and apply code coverage metrics effectively. Additionally, you will explore using AutoFixture and running tests in parallel to enhance your testing strategy.
Are there any topics or tools that are not covered in this course?
The course does not cover introductory C# programming or the basics of software development. It assumes prior knowledge in these areas. While it provides a comprehensive overview of unit testing in C#, it does not delve into other testing methodologies such as integration testing or system testing.
How much time should I expect to commit to complete the course?
The course comprises 44 lessons, but the total runtime is not specified. Given the detailed nature of the lessons, including practical exercises and real-world code testing, you should expect to invest significant time in hands-on practice to fully grasp the material. It is designed to be a thorough exploration of unit testing in C#.