What are the reasons behind to perform white box testing?

There are three main reasons behind performing the white box testing.

• Programmers may have some incorrect assumptions while designing or implementing some functions.

• Certain assumptions on flow of control and data may lead programmer to make design errors. To uncover the errors on logical path, white box testing is must.

• There may be certain typographical errors that remain undetected even after syntax and type checking mechanisms. Such errors can be uncovered during white box testing.