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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

Grouping objects into collections and performing actions on this collection are one of the most fundamental programming tasks. Given its importance, it's helpful to recall the `ICollection` class and some of its capabilities.

The `ICollection` class is a base interface for all other classes in the `System.Collections` namespace. The generic equivalent is the `System.Collections.Generic.ICollection<T>` interface. The `ICollection` interface itself extends the `IEnumerable` interface. This basic schematic is shown in the figure below:




# Introduction

Grouping objects into collections and performing actions on this collection are one of the most fundamental programming tasks. Given its importance, it's helpful to recall the `ICollection` class and some of its capabilities.

The `ICollection` class is a base interface for all other classes in the `System.Collections` namespace. The generic equivalent is the `System.Collections.Generic.ICollection<T>` interface. The `ICollection` interface itself extends the `IEnumerable` interface. This basic schematic is shown in the figure below:




Learn when and how to assert lists and objects contained in lists.

Assertions and Test Cases for Enumerables and Collections

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

Assertions and Test Cases for Enumerables and Collections

Introduction