Introduction

A critical part of the software development process is ensuring the software works! We mentioned earlier that it is possible to logically prove that software works by constructing a state transition table for the program, but once a program reaches a certain size this strategy becomes less feasible. Similarly, it is possible to model a program mathematically and construct a theorem that proves it will perform as intended. But in practice, most software is validated through some form of testing. This chapter will discuss the process of testing object-oriented systems.

Key Terms

Some key terms to learn in this chapter are:

Informal Testing
Formal Testing
Test Plan
Test Framework
Automated Testing
Assertions
Unit tests
Testing Code Coverage
Regression Testing

Key Skills

The key skill to learn in this chapter is how to write C# unit test code using xUnit and the Visual Studio Test Explorer.