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Dynamic testing takes place when the program itself is run. These two approaches are used to describe the point of view that the tester takes when designing test cases. A hybrid approach called grey-box testing may also be applied to software testing methodology. White-box testing White-box testing also known as clear box testing, glass box testing, transparent box testing, and structural testing verifies the internal structures or workings of a program, as opposed to the functionality exposed to the end-user.
In white-box testing, an internal perspective of the system the source codeas well as programming skills, are used to design test cases. The tester chooses inputs to exercise paths through the code and determine the appropriate outputs.
While white-box testing can be applied at the unitintegrationand system levels of the software testing process, it is usually done at the unit level. Though this method of test design can uncover many errors or problems, it might not detect unimplemented parts of the specification or missing requirements.
Techniques used in white-box testing include: This allows the software team to examine parts of a system that are rarely tested and ensures that the most important function points have been tested.
This is helpful in ensuring correct functionality, but not sufficient since the same code may process different inputs correctly or incorrectly. Pseudo-tested functions and methods are those that are covered but not specified it is possible to remove their body without breaking any test case.
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Black-box testing Black box diagram Black-box testing also known as functional testing treats the software as a "black box", examining functionality without any knowledge of internal implementation, without seeing the source code. The testers are only aware of what the software is supposed to do, not how it does it. Test cases are built around specifications and requirements, i. It uses external descriptions of the software, including specifications, requirements, and designs to derive test cases.
These tests can be functional or non-functionalthough usually functional. Specification-based testing may be necessary to assure correct functionality, but it is insufficient to guard against complex or high-risk situations. Whatever biases the programmers may have had, the tester likely has a different set and may emphasize different areas of functionality. On the other hand, black-box testing has been said to be "like a walk in a dark labyrinth without a flashlight.
This method of test can be applied to all levels of software testing: Component interface testing Component interface testing is a variation of black-box testingwith the focus on the data values beyond just the related actions of a subsystem component. One option for interface testing is to keep a separate log file of data items being passed, often with a timestamp logged to allow analysis of thousands of cases of data passed between units for days or weeks.
Tests can include checking the handling of some extreme data values while other interface variables are passed as normal values. Visual testing[ edit ] The aim of visual testing is to provide developers with the ability to examine what was happening at the point of software failure by presenting the data in such a way that the developer can easily find the information she or he requires, and the information is expressed clearly.
Visual testing, therefore, requires the recording of the entire test process — capturing everything that occurs on the test system in video format. Output videos are supplemented by real-time tester input via picture-in-a-picture webcam and audio commentary from microphones.
Visual testing provides a number of advantages. The quality of communication is increased drastically because testers can show the problem and the events leading up to it to the developer as opposed to just describing it and the need to replicate test failures will cease to exist in many cases. The developer will have all the evidence he or she requires of a test failure and can instead focus on the cause of the fault and how it should be fixed.