Gain insights into unit testing principles, and delve into configuring and using NUnit. Discover how to write effective tests, maximize coverage, and elevate your testing projects.

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Industry, employers, startups, and amateur developers are increasingly looking towards unit testing their software. Unit testing is one of the most reliable ways to find and keep software bugs at bay, thus reducing costs and development pains. Developers working with the .NET framework are overwhelmingly turning to NUnit to meet their unit testing needs.

In this course, you’ll learn the principles of unit testing, and in the process, learn to configure and use the NUnit testing framework. Given that the course places an emphasis on principles, these skills are transferable to other unit testing frameworks. Alongside these, you’ll also get hands-on experience with projects and exercises that provide ample opportunities to learn how to design effective tests in the NUnit framework.

At the end of the course, you’ll be able to quickly write unit tests that maximize logical coverage, test complex applications, and better organize your testing projects—setting you up as a natural leader in your organization.

Mastering Unit Testing Principles with NUnit

## Introduction

The essence of object-oriented code is summarized as code that has elements of inheritance, encapsulation, and polymorphism. Each of these concepts can be summarized as follows:
- **Inheritance** is an abstraction for sharing similarities among classes.
- **Encapsulation** is the grouping some related data items and the methods that operate on that data into a single unit.
- **Polymorphism** allows access to objects of different types through the same interface.

In the context of inheritance, it is important to distinguish whether an instance is an exact type or whether an instance is an "is-a" type. This distinction is important since it sometimes informs the way tests are written.

## Quick recap on inheritance

When speaking about inheritance, we always refer to a base class and a derived class. The **derived class** is the class that inherits from the base class. The **base class** is the class being inherited from. In this lesson, we’ll refer to the example of using inheritance to model animals:

# Introduction

The essence of object-oriented code is summarized as code that has elements of inheritance, encapsulation, and polymorphism. Each of these concepts can be summarized as follows:
- **Inheritance** is an abstraction for sharing similarities among classes.
- **Encapsulation** is the grouping some related data items and the methods that operate on that data into a single unit.
- **Polymorphism** allows access to objects of different types through the same interface.

In the context of inheritance, it is important to distinguish whether an instance is an exact type or whether an instance is an "is-a" type. This distinction is important since it sometimes informs the way tests are written.

# Quick recap on inheritance

When speaking about inheritance, we always refer to a base class and a derived class. The **derived class** is the class that inherits from the base class. The **base class** is the class being inherited from. In this lesson, we’ll refer to the example of using inheritance to model animals:

Learn when and how to assert types of objects and whether their type is part of an inheritance tree.

Fundamentals of Unit Testing

Testing Conditions With Classic And Fluent Assertions

Making Unit Testing More Effective

Unit Testing Code with External Dependencies

Conclusion

Appendix - Unit Test Project Organization and Console Setup

Asserting Types

Introduction

Quick recap on inheritance