What is white box testing?

When internal implementation and internal code structure are known to the tester, while testing an application, it is called white box testing. White box testing involves code veri fication for security holes, poorly structured code process path, data flow of inputs in code, conditional loop, testing of statement, object, and functions in each code class. Some of the testing techniques for white box testing are Statement Coverage, Branch Coverage, Decision, Condition, Control flow and Data flow testing.