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Test stub
In computer science, test stubs are programs that simulate the behaviors of software components (or modules) that a module undergoing tests depends on.
Test stubs are mainly used in incremental testing's top-down approach. Stubs are computer programs that act as temporary replacement for a called module and give the same output as the actual product or software.
==Example==
Consider a computer program that queries a database to obtain the sum price total of all products stored in the database. In this example, the query is slow and consumes a large number of system resources. This reduces the number of test runs per day. Secondly, tests may include values outside those currently in the database. The method (or call) used to perform this is ''get_total()''. For testing purposes, the source code in ''get_total()'' can be temporarily replaced with a simple statement that returns a specific value. This would be a test stub.
Several testing frameworks are available, as is software that generates test stubs based on existing source code and testing requirements.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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