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Testing can only show the presence of errors in a program. It cannot demonstrate that there are no remaining faults. Development testing is the responsibility of the software development team. A separate team should be responsible for testing a system before it is released to customers. Development testing includes unit testing, in which you test individual objects and methods component testing in which you test related groups of objects and system testing, in which you test partial or complete systems. When testing software, you should try to ‘break’ the software by using experience and guidelines to choose types of test case that have been effective in discovering defects in other systems. Wherever possible, you should write automated tests. The tests are embedded in a program that can be run every time a change is made to a system.