White box testing and black box testing are two different testing methodologies based on the level of knowledge about the internal workings of the software being tested.
White box testing, also known as glass box or clear box testing, is a testing methodology where the tester has complete knowledge of the internal workings of the software and its code. The tester can use this knowledge to test individual functions, data structures, and algorithms within the code, and verify that they are working correctly. The goal of white box testing is to ensure that the individual components of the software are working correctly and are properly integrated.
On the other hand, black box testing is a testing methodology where the tester does not know the software's internal workings. The tester only has knowledge of the inputs and outputs of the software and is only concerned with verifying that the software produces the expected results for a given set of inputs. The goal of black box testing is to confirm that the software functions correctly from the end-users perspective and that it meets the requirements and specifications.
In summary, white box testing focuses on the internal workings of the software, while black box testing focuses on the external behavior of the software.
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