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Test Driven Development in ASP.NET Core - The Handbook (Udemy.com)

Get Hands-On experience using Unit testing to produce a bullet proof and testable N-Tier .NET Core application.

Created by: Trevoir Williams

Last updated November 2025

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What you will learn

  • Unit Testing - Testing Core Application Code
  • Moq Framework
  • xUnit Testing Framework
  • Integration Testing - Testing Third Library Interactions (Like EF Core)
  • Application Level Unit Testing - Testing that the MVC Application behave correctly
  • Test Driven Development - Red-Green-Refactor Cycle
  • Using Facts and Theories to write tests
  • How to write testable code
  • Know about good unit testing patterns and practices
  • Unit testing in N-tier web application projects using xUnit
  • Continuous Integration and Git Branch Protection

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Quality Score

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Overall Score : 96 / 100

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Course Description

Test Driven Development (TDD) is a powerful approach to building reliable and robust software. This course will teach you how to apply TDD in your .NET projects. Unit Testing is a type of software testing where code is written to automate the testing of sub-sections of an entire application. This methodology gives more functional coverage and reduces the need for manual regression testing when the application's code changes. The purpose is to validate that each unit of the software code performs as expected.

Everything in this course is .NET 6 / .NET 7 compatible.

You will discover the basics of unit testing and the red-green-refactor cycle. You will also learn how to test and implement business logic in a .NET Core application using xUnit as a testing framework and Moq as a mocking library.

After this course, you will have the foundational knowledge of Test Driven Development that will help you as you move forward to test and implement new features in your C# projects. You will have the skills and knowledge to create a testable and maintainable ASP.NET Core application to architect real-world enterprise .NET Core apps.

Build A Strong Foundation in Unit Testing in .NET:

  • Use xUnit Test Projects.

  • Use Moq and Shouldly(Fluent Assertions) to write unit tests.

  • GitHub Projects to Track Requirements

  • Conduct Red, Green, Refactor Test-driven development (TDD)

  • Practice Test-Driven Development in actual code

  • Learn to write testable code

  • Understand how to write unit tests, then create or refactor code

  • Review Pitfalls to avoid and common challenges

  • Learn how to set up a Continuous Integration Pipeline using GitHub.


Content and Overview

To take this course, you must have some knowledge of .NET Core development and C#.

With just over 4 hours of premium content, smartly broken up to highlight related activities based on each module in the application being built; we will also look at troubleshooting and debugging errors as we go along, implementing best practices, writing efficient logic, and understanding why developers do things the way they do. Your knowledge will grow, step by step, throughout the course, and you will be challenged to be the best you can be.

We sometimes do things differently than the first time; that is not the reality of writing code. We make mistakes and point them out and fix them around them. By doing this, we develop proficiency in using debugging tools and techniques. By the time you have finished the course, you will have moved around in Visual Studio and examined logic and syntax errors so much that it will be second nature for you when working in the .NET environment. This will put your newly learned skills into practical use and impress your boss and coworkers.

The course is complete with working files hosted on GitHub, including some files to make it easier for you to replicate the demonstrated code. You will be able to work alongside the author as you work through each lecture and will receive a verifiable certificate of completion upon finishing the course.

Clicking the Take This Course button could be the best step to increase your income and marketability quickly! Also, remember that if you think the course is not worth what you spent, you have a full 30 days to get a no questions asked refund!


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See you in the course!



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Instructor Details

Trevoir Williams

Trevoir Williams is a software and systems engineer, author, instructor, and technical educator specializing in .NET, Azure, SQL Server, microservices, DevOps, secure coding, and AI-powered application development. He holds a master’s degree in Computer Science with a focus on Software Development and has earned multiple Microsoft Azure certifications.

As an author and instructor, Trevoir focuses on practical, production-ready software development. He is the author of Microservices Design Patterns in .NET and Effective .NET Memory Management, and a contributor to the Azure Integration Guide for Business. His work helps developers understand modern architecture, data access, messaging, observability, security, cloud deployment, performance, and AI integration with real implementation context.

Trevoir has taught more than 500,000 learners through online courses on ASP.NET Core, Entity Framework Core, SQL Server, Microsoft Azure, microservices, DevOps, secure application development, and generative AI. He also teaches thousands more through his YouTube tutorials, articles, and practical technical content.

His teaching philosophy is simple: explain the why, build the how, and help learners develop the confidence to apply both in real systems.

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Reviews

4.8

506 ratings on Udemy

Select a bar to show only those reviews.Select the bar again to show every rating.

By Pavel H on 11/1/2025

The course presents the basics of testing. It's well explained. But it's only a brief introduction of the basic concepts before searching more details on the Internet or in other courses. It was helpful for me. The biggest problem I had with this course is that almost each section changes the structure of the solution completely. New projects are added, classes are moved among them, namespaces are changed, usings are fixed and so on. It takes a lot of time to get the solution to the required state so that I could continue learning. I estimate that I spend only 70% of the course time on the actual learning and 30% of my time was devoted just to moving things around, refactoring and syncing the solution structure with the expected one. Of course, it would be easier to download the solution for each of the section from the learning resources ... if they would be up-to-date. In fact, the learning resources are old - mostly in .NET 7 at the time when .NET 9 is the latest stable version and .NET 10 will be out soon. It's possible to update the learning resources yourself but because the solution is scattered in a lot of small project, this would be almost just as time-consuming as writting everything yourself. The course is not bad but the learning materials are out-dated, which is the problem for the majority of the Udemy courses.

By Prashanth Krishnan on 6/26/2023

Thank you Trevior, this is really great. You are a calm and easy going teacher. Please keep these courses coming you are doing a great job

By Anonymized User on 6/22/2023

extremely helpful and clear, I was struggling getting to grips with integration testing after moving to c#/Asp.Net from Java/Spring Boot and this course is helping me to get up to the same standard in c# as I am in Java

By Isaiah on 2/6/2023

The instructor has in-depth understanding of the course and also has good on-hands experience of the Unit Testing Processes. I highly recommend this course to other students

By Darel Johnson on 1/10/2023

This course on Test Driven Development in ASP.NET Core is a great resource for developers looking to improve their skills in writing maintainable and robust code. The instructor does a great job of breaking down the concepts of TDD and explaining how they can be applied in the context of an ASP.NET Core application. One of the things I appreciated most about this course was the focus on hands-on learning. The instructor provides a number of practical exercises throughout the course, which allowed me to immediately apply what I was learning to my own code. The course starts with a brief introduction to the basics of TDD, including the concepts of red-green-refactor, and then proceeds to cover the use of popular test frameworks such as xUnit and Moq. The course is not limited to just the testing aspect, but also includes the setup of an ASP.NET Core application for testing and for that the instructor uses an appropriate language that is not just too technical to follow. One of the other things I liked about this course is that it provides a lot of helpful tips and tricks for working with ASP.NET Core and TDD. These were incredibly useful, and have already helped me to write cleaner, more maintainable code. Overall, I would highly recommend this course to any developer looking to improve their skills in TDD and ASP.NET Core. The course is well-structured, the instructor is knowledgeable and engaging, and the hands-on exercises are a great way to apply what you're learning.

By Ryan Niño Dizon on 1/8/2023

The course is pretty straight forward and easy to understand since Trevoir explained the topics as simple as possible. I think the concept will still be applicable to the future version of .net core and other programming language. Nice Work!

By Vilfred Hebibasi on 9/12/2022

Very good and practical course. It helped me a lot to understand the important basics of unit testing in .Net and how to apply them in the project I'm currently working with.

By Callum Marshall on 6/15/2022

I needed to understand how to unit test for a N-tiered application and Trevoir provided me with the foundation I needed to gain this understanding.

By Ashley on 6/2/2022

I really enjoyed this course. I have used TDD in the past but found it hard to write tests for my seperated concerns. The course showed me how to now do this correctly. Thank you.

By Elvin Dauz on 11/13/2021

Overall, easy to follow. Talks clearly and pacing was just right. Depth of knowledge is just what I'm expecting. Only thing that I think is missing is how to get multiple data as input for testing (e.g., wrong email in one request and another is an error on date). But thanks for giving us the foundation to perform TDD!

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