Black box testing and white box testing

Question

Explain about the black box testing and the white box testing?

Answer 1

Black box testing:

a) In order to develop the test cases, no knowledge of internal logic of the system is used.
b) This uses validation techniques.
c) Practised during the later stages of testing.
For examples: integration testing, unit testing, acceptance testing, system testing.

White box testing :

a) In order to develop the test cases, Knowledge of internal logic of system is used.
b) It uses verification techniques
c) It is practised early in the testing process.