Introduction
When the code and the complexity of your software grows, generating tests to ensure your program does what it is supposed to do is the best tool to provide you with a firm footing over rocky terrain.
Tests are, in essence, double-checking the code is valid and doing what it is supposed to do. This is a deceptively simple statement, but in practice, it can be very difficult.
Mastering the ability to test is a difficult task and is worth a book or two. The tasks introduced in this chapter move from business-oriented tasks to software engineering tasks, which is a different approach. The objective of this chapter is to present some practical aspects of testing to introduce the subject.
The most important thing about a test is that it tries to check the code that is being tested independently. This involves a mindset of looking at the code and the inputs and outputs and approaching the task with a fresh look, and to not be influenced by the internal...
