ISBN : 978-81-963532-2-3 (E-Book) systematic approaches should be followed to design an optimal test suite. In an optimal test suite, each test case is designed to detect different errors. Functional Testing Vs. Structural Testing In the black-box testing approach, test cases are designed using only the functional specification of the software, i.e. without any knowledge of the internal structure of the software. For this reason, black-box testing is known as functional testing. On the other hand, in the white-box testing approach, designing test cases requires thorough knowledge about the internal structure of software, and therefore the white-box testing is called structural testing. Fig.Unit testingwiththehelp of driverandstub modules BLACK-BOX TESTING Testing in the large vs. testing in the small Software products are normally tested first at the individual component (or unit) level. This is referred to as testing in the small. After testing all the components individually, the components are slowly integrated and tested at each level of integration (integration testing). Finally, the fully integrated system is tested (called system testing). Integration and system testing are known as testing in the large. 90 Software Engineering Keerthana P, Manasa KN, Ganga D Bengal
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