he size of the test module. Test cases can be produced from a specification or code analysis module, the corresponding test strategy can be divided into black box testing and white box testing, and there are two kinds of methods and bination, the incremental and delta test. The incremental testing testing each module respectively, then assembled into a system, no further testing; The incremental test for each module and bination test was tested modules. Incremental test can detect the error earlier. Top-down or bottom-up testing them are based on this kind of assumption: module called relationship as a directed acyclic graph. Clue is a kind of incremental testing method, es from demand of the basis of system verification. Another strategy that testing early start from software development.
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