What does mean by white box testing ?

Answer 1

White box testing is a testing which is done by the devloper . in this type of testing devloper checks each and every line of code.
It is done in two ways. first is manually and second is with the help of UTP (Unit test program). UTP is nothing but it is just a program which is used to check the main program code. there are so many UTP tools by which a devloper can create a UTP program.
In white box testing, devloper test the code in three ways :-
1) path check
2) conditional check
3) loop check

Answer 2

There are various types of testing techniques which are used while testing a software component or product.
Majorly, two names are used one is known as "black box" testing and "white box" testing.
In white box testing, a tester chooses test cases based on an analysis of internal structures (Code coverage, branch coverage, statement coverage, path coverage and statement coverage etc) of a system or component.
Different types of white box testing:
1. Statement coverage.
2. Decision coverage.