SOFTWARE TESTING PRINCIPLES

TESTING SHOWS PRESENCE OF DEFECTS

• But cannot prove there are no defects
• No 100% defect free software

EXHAUSTIVE TESTING S IMPOSSIBLE

• If there are 15 fields each with 5 input combination to test all there combination,we need 5^15 tests.

EARLY TESTING

DEFECT CLUSTERING

• Small number of modules contains most of the defects during pre- release testing.

TESTICIDE PARODOX

• Small set of test cases will not be able to find any new bugs.
• It is important to review test cases regularly and write view test cases

TESTING IS CONTEXT DEPENDENT

• Different kinds of sites are tested dfferently
• e.g. Banking site, ecommerce

ABSENCE OF ERROR FALLACY

• If the software does not fulfill the user needs and expectations then finding and fixing defects does not clear.