Book Image

Learn Qt 5

By : Nicholas Sherriff
Book Image

Learn Qt 5

By: Nicholas Sherriff

Overview of this book

Qt is a mature and powerful framework for delivering sophisticated applications across a multitude of platforms. It has a rich history in the Linux world, is widely used in embedded devices, and has made great strides in the Mobile arena over the past few years. However, in the Microsoft Windows and Apple Mac OS X worlds, the dominance of C#/.NET and Objective-C/Cocoa means that Qt is often overlooked. This book demonstrates the power and flexibility of the Qt framework for desktop application development and shows how you can write your application once and deploy it to multiple operating systems. Build a complete real-world line of business (LOB) solution from scratch, with distinct C++ library, QML user interface, and QtTest-driven unit-test projects. This is a suite of essential techniques that cover the core requirements for most LOB applications and will empower you to progress from a blank page to shipped application.
Table of Contents (11 chapters)

Unit testing

The essence of unit testing is to break an application down into its smallest functional blocks (units) and then test each unit with real-world scenarios within the scope of the initiative. For example, take a simple method that takes two signed integers and adds them together:

int add(intx, int y);

Some example scenarios can be as listed:

  • Adding two positive numbers
  • Adding two negative numbers
  • Adding two zeroes
  • Adding one positive and one negative number
  • Adding zero and a positive number
  • Adding zero and a negative number

We can write a test for each of these scenarios and then every time our code base changes (any code, not just our add() method), these tests can be executed to ensure that the code still behaves as expected. It is a really valuable tool to give you confidence that any code changes you make aren’t having a detrimental effect on the existing...