Black box testing vs white box testing
Combine black box, gray box and white box testing for the most comprehensive analysis of your application.
Black box tests are developed from sources such as user stories and functional specifications. They enable QA to focus on verifying features and usability without reliance on the underlying code. This can help catch defects that might be missed due to assumptions about the code.
By contrast, white box tests such as unit and integration tests are created with an understanding of the internals of the application and access to the source code. White box testing may catch defects that are unobserved or that can’t be tested directly in the user interface. Gray box tests combine the other approaches: they are developed from the user perspective, but with some understanding of how particular features were implemented.
A combination of black box, grey box and white box testing allows you to benefit from the strengths of each approach and offset the drawbacks.