White Box Testing is a software testing approach where the internal structure, logic, and code of an application are fully visible to the tester. Instead of only checking what the software does from the outside, the tester examines how the program works internally. This includes reviewing code, verifying logic paths, checking conditions, loops, and data flows to ensure everything functions correctly.
In White Box Testing, the tester usually has programming knowledge because they need to understand the code. They design test cases based on how the code is written, ensuring that all possible paths, branches, and conditions are tested. The main goal is to make sure that the internal operations of the software are accurate, efficient, and secure.
This type of testing helps identify issues such as logical errors, incorrect assumptions, security vulnerabilities, and inefficient code. For example, a tester might check whether all conditions in an if-else statement are properly handled or whether loops terminate correctly. It also ensures that every line of code is executed at least once, which is often referred to as code coverage.
White Box Testing is commonly performed during the development phase by developers or testers with coding skills. It complements other testing methods by focusing on internal quality rather than just external behavior. While it can be time-consuming and requires technical expertise, it is highly effective in improving code quality and preventing defects early in the software development lifecycle.
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