Mastering Unit Testing with Moq and NSubstitute!

Name: Mastering Unit Testing with Moq and NSubstitute!
Rating: 5.0 (2 reviews)

From zero to hero in unit testing: Use Moq and NSubstitute to build better .NET applications.

Created byDipali Naik

Last updated 5/2025

English

What you'll learn

Understand the principles of unit testing and mocking in .NET applications.
Implement test-driven development (TDD) using Moq and NSubstitute frameworks.
Write effective and maintainable unit tests to validate business logic.
Apply mocking techniques to simulate dependencies and improve test reliability.

Course content

7 sections • 13 lectures • 49m total length

Introduction to the Course1:48
Learn core unit testing and mocking in C# by practicing interface mocking with mock and substitute to validate behavior for strings, collections, and exceptions, with best practices for clean tests.

What is Unit Testing?3:13
Learn what unit testing is by verifying each small piece of code with mock and nsubstitute, and see how it fits with requirements, coding, and integration and system testing.
Why is Unit Testing Important?1:37
Discover why unit testing matters by comparing each function to a solid brick, catching bugs early, saving time, and giving you confidence that your code remains reliable as it evolves.

Introduction to Moq and NSubstitute0:49
Compare two popular .NET mocking tools, mock and nsubstitute, for creating fake services or interfaces. Use mock for more control and features, or nsubstitute for quicker, readable syntax.
Installing Moq, NSubstitute, and xUnit in Visual Studio2:33
Set up a Visual Studio xUnit test project, and install mock and nsubstitute via NuGet or package manager, then start writing tests with mocked dependencies.

Project Structure Explained2:42
Explore the core project structure and test project, using interfaces for inventory, order, payment, and shipping, and unit tests with XUnit and mocking with Moq or NSubstitute.
Writing Unit Tests with Moq13:33
Learn to write unit tests with Moq and NSubstitute by mocking inventory, payment, and shipping services to verify the place order method under happy and negative scenarios.
Using NSubstitute for Unit Testing2:37
Discover how to implement unit tests with nsubstitute, creating a substitute for IPaymentService and setting up processPayment without setup, while comparing fluent syntax to mock.
Improving Test Structure by Separating Mock Setup9:28
Move mock creation to dedicated classes in a separate mocks folder, reducing repetition in tests. Initialize default isInStock, processPayment, and calculateShipping in constructors, and override as needed for specific scenarios.

Requirements

Basic knowledge of C# and .NET development.
Familiarity with object-oriented programming concepts.

Description

Are you ready to level up your unit testing skills and write more reliable, maintainable code?

In Mastering Unit Testing with Moq and NSubstitute!, you’ll learn how to build robust unit tests using industry-standard frameworks like Moq, NSubstitute, and xUnit — whether you’re a developer looking to improve code quality or a tester wanting to strengthen your automation toolkit.

What You’ll Learn:

The fundamentals of unit testing and why it’s essential for modern software development
How to effectively use Moq and NSubstitute to mock dependencies
Setting up your testing environment with xUnit in Visual Studio
Writing clean, maintainable unit tests for different return types and scenarios
Structuring test projects for scalability and readability
Best practices to avoid over-mocking while keeping tests isolated and efficient

Course Structure:

We’ll start with the basics of unit testing and mocking, then dive into practical, hands-on examples where you’ll learn to:

Set up and configure Moq and NSubstitute
Write tests for various data types and return types
Improve test organization by separating mock setup logic
Apply real-world techniques to improve your overall testing strategy

By the end of this course, you’ll have the confidence to implement unit tests in your .NET applications and optimize your workflow with powerful mocking frameworks.

Who This Course Is For:

Software Developers looking to strengthen their testing skills
Testers/QA Engineers interested in automating unit tests
Anyone working with C#/.NET who wants to improve code quality using Moq and NSubstitute
Beginners in unit testing who want a clear, step-by-step approach

Prerequisites:

Basic knowledge of C#/.NET
Visual Studio installed (any recent version)
A desire to improve code quality through testing!

Why Take This Course?

Unit testing not only helps you catch bugs early but also gives you confidence when making changes to your codebase. With Moq and NSubstitute in your toolkit, you’ll be able to mock dependencies with ease and create cleaner, more maintainable tests.

Ready to master unit testing and take your coding skills to the next level?
Let’s get started!

Who this course is for:

software developers
QA engineers
SDETs

Mastering Unit Testing with Moq and NSubstitute!

What you'll learn

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Course content

Course Overview1 lecture • 2min

Introduction to Unit Testing2 lectures • 5min

Introduction to Mocking2 lectures • 3min

Introduction To Moq and Nsubstitute2 lectures • 3min

Setting Up Mocks for Unit Testing4 lectures • 28min

Advanced Unit Testing with Moq1 lecture • 6min

Wrapping Up & Final Thoughts1 lecture • 1min

Requirements

Description

Who this course is for: