White Box Testing is a software testing method in which bodily structure, design, and coding of software are examined to verify the progress of input-output and to better design, usability, and safety. In white-box testing, code is transparent to testers. This makes it furthermore described as Open box testing, transparent box testing, Code-based testing, Clear box testing, or even Glass box testing.

It is one of two pieces of the Box Testing strategy to software testing. Its counterpart, Blackbox testing, includes testing from outside or end-user-type prospects. On the other hand, White box testing in software engineering is based on internal operations.

What do you verify in White Box Testing?

White box testing includes the testing of the software code for the following:

  • Internal security breaches
  • Defective or poorly structured routes in the coding processes
  • The flow of particular inputs through the code
  • Conventional output
  • The functionality of dependent loops
  • Testing of every statement, object, and function on an exclusive basis

How do you perform White Box Testing?

To give you an uncomplicated explanation of white box testing, we have divided it into two primary steps. This is what testers do when inquiring about an application utilizing the white box testing technique:


The first thought a tester will often do is study and assume the source code of the application. The validator must be very proficient in the programming languages utilized in the applications they are testing because white box testing requires the testing of the inner workings of an application. Also, the testing person must be extremely aware of secure coding methods. Security is often one of the principal purposes of testing software. The tester should be able to find protection issues and deter intrusions from hackers and inexperienced users who might inject wicked code into the application either intentionally or unknowingly.


The second essential step to white box testing includes testing the application’s source code for peculiar flow and structure. One way is by rewriting more code to test the application’s source code. The tester will produce small tests for each process or group of processes in the application. This method demands that the tester must have familiar knowledge of the code and is usually done by the developer. Other methods cover Manual Testing, trial, and failure testing, and the use of testing tools.

White Box Testing Techniques

A significant White Box testing technique does Code Coverage analysis. Code Coverage analysis reduces gaps in a Test Case suite. It recognizes areas of a plan that are not operated by a set of test cases. Once holes are known, you create test cases to support untested portions of the code. Thereby developing the condition of the final software product.

There are automated tools ready to implement Code coverage analysis. Below are some coverage analysis techniques a box tester can accept:

Statement Coverage:- This technique wants every possible statement in the code to be examined at least once during the testing method of software engineering.

Branch Coverage – This technique experiments with every credible path (if-else and other conditional loops) of a software application.

Following are some other great WhiteBox Testing Techniques:

  • Statement Coverage
  • Decision Coverage
  • Branch Coverage
  • Finite State Machine Coverage
  • Path Coverage
  • Control flow testing
  • Data flow testing
  • Condition Coverage
  • Multiple Condition Coverage

Types of White Box Testing

White box testing comprises various testing types. They are majorly used to evaluate the usability of an application, block of code, or appropriate software package. Some of them are listed below,

Unit Testing: It is frequently the primary type of testing executed on an application. Unit Testing is conducted on each unit or block of code as it is received. A programmer performs the unit testing. As a software developer, you acquire a few lines of code, a single function, or an object and examine it to make sure it works before proceeding Unit Testing helps recognize a preponderance of bugs, early in the software development lifecycle. Bugs distinguished in this stage are more economical and simple to fix.

Testing for Memory Leaks: Memory leaks are the principal causes of more backward running applications. In a situation where you have a slow-running software application, you will want a QA expert who is experienced at distinguishing memory leaks.

Apart from the above, a few testing standards are part of both black box and white box testing. They are arranged below

  • White Box Penetration Testing: In this testing, the tester/developer has full knowledge of the application’s source code, complete network information, IP addresses included, and all server data the application runs on. The aim is to advance the code from several points to detect security intimidations.
  • White Box Mutation Testing: Mutation testing is usually used to identify the most proven coding techniques to practice for developing a software solution.

Advantages of White Box Testing

  • Code is optimized by finding hidden errors.
  • White box tests problems can be quickly automated.
  • Testing is more accurate as all code paths are regularly included.
  • Testing can start fresh in SDLC also if GUI is not possible.

Disadvantages of WhiteBox Testing

  • White box testing can be quite complicated and costly.
  • Developers who regularly execute white box test cases loathe it.
  • White-box testing is time-consuming, more influential programming applications take the course to test thoroughly.

Ending Notes: White box testing can be pretty complex. The complexity required has a lot to do with the application being examined. A small application that offers a single simple operation could be white box tested in few moments, while more extensive programming applications take times, weeks, and even longer to fully experiment. If you want White box testing in software testing should be done on your software application, then consult with Skyhidev, one of the top software company in Toronto.