It is reasonable to check software programs for failures after they are bought. Quality assurance service is used to ascertain that mobile, desktop and web apps contain no defects and deliver excellent user experience.
For starters, imagine that you run software that can interact with the printer completely independently. There was a time when a programmer could write a program capable of working only with one particular type of printer. If a user connected another printer to the computer, the programmer had to modify the program, adding commands to it to manage the new printer. Although this work was not particularly complicated, the need to support the program for a long time and to ensure it would work with an expanding set of devices could become a real torture.
Fortunately, this problem has already been solved. The salvation of the programmers was the concept of ‘virtual printers’ – abstract devices with a fixed set of features and commands. Namely these commands to manage virtual printers are included in the application, and the intermediate program, called a driver, translates them into the language of a particular device.
To make sure that the build continues working with new changes and they have not adversely affected the old functionality you may use regression testing services. It is a reliable way to determine whether or not the program has regressed.
In modern operating systems, a printing device’s name is specified when configuring it. Device drivers are part of the operating system and are supplied with it. If there is no device-specific driver in the system, it can be installed separately, and it will also be considered as part of the system. Typically, hardware manufacturers supply their device drivers together with their device hardware.
The advantage of this approach is that an application program does not know anything about a printer installed in the system. It sends the control commands and data to the virtual printer without worrying about how they will be transferred to a particular device and which changes will be needed for that.
All device drivers can be loaded on the system only after they are thoroughly tested for compatibility with a variety of software apps. Therefore, if the program transfers the correct information to a virtual printer, its commands will be correctly executed and translated into the language of a particular device.
Exploratory testing servicesprovided by http://testmatick.com come in useful when you need to explore each facet of software program in an unscripted environment. This test technique helps to identify all possible defects and bugs that cannot be caught through other verification methods.