TESTING METHODOLOGY (OR) TESTING TECHNIQUES

There are 3 methods are there
1) Black Box Testing
2) White Box Testing
3) Gray Box Testing
1 Black Box Testing
It is a method of testing in which one will perform testing only on the functional part of an application with out having any structural knowledge. Usually test engineers perform it.
2 White box Testing (Or) Glass box Testing (Or) Clear box Testing
It is a method of testing in which one will perform testing on the structural part of an application. Usually developers are white box testers perform it.
3 Gray box Testing
It is a method of testing in which one will perform testing on both the functional part as well as the structural part of an application.
Note:
The Test engineer with structural Knowledge will perform gray box testing.