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Testing can be through black-, white- or grey-box testing.In white-box testing the tester is concerned with the execution of thestatements through the source code. In black-box testing the software is run tocheck for the defects and is less concerned with how the processing of theinput is done. Black-box testers do not have access to the source code.Grey-box testing is concerned with running the software while having anunderstanding of the source code and algorithms