White Box Testing in Software Engineering
What is White Box Testing?
White box testing, also known as structural testing or glass box testing, is a method of testing software in which the internal structure and design of the code being tested is known and used as the basis for creating test cases.
This type of testing focuses on verifying that the code functions as intended and that all statements have been executed, as well as checking for compliance with programming standards and identifying potential bugs or vulnerabilities.
It can be done by developers or testers, and it is usually done in combination with black box testing, which tests the software from the user’s perspective without knowledge of the internal structure.
Types of White Box Testing in Software Testing
White box testing is a type of software testing that examines the internal structure and design of a program or application. The following are some common types of white box testing:
Tests individual units or components of the software to ensure they function as intended.
Tests the interactions between different units or components of the software to ensure they work together correctly.
Tests the functionality of the software to ensure it meets the requirements and specifications.
Tests the performance of the software under various loads and conditions to ensure it meets performance requirements.
Tests the software for vulnerabilities and weaknesses to ensure it is secure.
Code coverage testing:
Masures the percentage of code that is executed during testing to ensure that all parts of the code are tested.
Tests the software after changes have been made to ensure that the changes did not introduce new bugs or issues.
Techniques of White Box Testing
There are some techniques which is used for white box testing –
1. Statement coverage:
Statement coverage is a testing technique in which tester traverse all statements and ensure that each statement of the code is executed at least once. Hence each line of the code is verified.
2. Branch Coverage :
Branch coverage is a technique used for testing in which test cases are designed so that each branch are tested at least once. This technique analyse every possible ways of the system.
3. Path Coverage :
Path Coverage is a software testing technique where all possible paths are defined and covered .paths are executable statements from entry to exit points in the system. It’s a time-consuming task.
4. Loop Testing :
By using this strategy, independent and dependent code loops and values are tested. Errors often occur at the beginnings and ends of loops.This strategy related to testing loops –
- Simple loops
- Nested loops
- Concatenated loops
5. Basis Path Testing :
In this basis path testing technique, control flow graphs are made from code and then Cyclomatic complexity is calculated. cyclomatic complexity defines the number of independent paths so that the minimal number of test cases can be designed.
Advantages of White Box Testing
Disadvantages of White Box Testing
Redesign of code needs test cases to be written again.
Missing functionalities cannot be detected.
This technique can be very complex and at times not realistic.
White-box testing requires a programmer with a high level of knowledge due to the complexity of the level of testing that needs to be done.
At sometimes, it is not realistic to be able to test every single existing condition of the application.
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