Dynamic testing proceeds in the opposite order of software development life cycle. It can start with unit testing in order to verify each unit of the program in isolation, and also be completed with acceptance testing. It also includes integration testing and system testing. Dynamic testing strategies fall into two categories: namely, “black box” testing and “white box” testing. Typically, white box testing strategy is applied at the unit level and system level, while the black box testing strategy is applied at the system level and acceptance level.
The purpose of unit testing is to make sure that all the intended functions are implemented in the code and that the program delivers consistent performance and the program module works as expected. During unit testing it is common to use drivers and stubs to manage the testing process, while in system testing the graphical user interface is usually used to manage sophisticated functions of several modules or subsystems.
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The purpose of system testing is to make sure that all interfaces between the modules or subsystems correspond to the input and output parameters, as well as other shared or transmitted data, such as records and database fields, shared GUI screens or shared communication lines.
System testing can start immediately after system testing of all the units is completed, or at least those that form the main subsystem. System testing should focus on global issues such as performance, scalability, availability, environmental resiliency and end-user acceptability.
During acceptance testing, software versions that are candidates for delivery to the market are investigated in order to access their acceptability to end users. If you use the rapid test methodology to complete all these steps of Software Testing Life Cycle, less and less time is required, since most of the errors are detected and eliminated in the early stages of development. The earlier you begin testing your software the less will it cost to detect issues in it.
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