Tuesday December 17, 2019
Software development life cycles are incomplete without software testing. Software testing plays a major role in ensuring the quality and proper functioning of your software product. There are two ways in which software testing can be carried out.
White box testing: Line to line testing of the code
Black box testing: Based on inputs and outputs.
In this article, we will read in detail about the white box testing.
What is White Box Testing?
Also referred to as clear, glass box or structural testing. It is a testing method that tests the internal structure of an application. As opposed to black-box testing, it does not focus on the functionality but involves line to line assessment of the code.
In white box testing, the tester has to go through the code line by line to ensure that internal operations are executed as per the specification and all internal modules are properly implemented.
White Box Testing Coverage
Why We Use White Box Testing?
To discover the following types of bugs:
Do Testers Require Programming Skills to Conduct White Box Testing?
As a tester, you will require to create test cases to cover the program logic completely. And hence you will require good programming skills for testing.
Testing each and every path of the loop from a large system is very exhaustive and hence is not possible. But you can select the important paths and test them to get desired results.
Difference Between White Box Testing and Black Box Testing
Both of them are two major classifications of software testing. They are very different from each other.
Steps to Perform White Box Testing
Step #1 – Learn about the functionality of the code. As a tester, you have to be well versed in programming language, testing tools, and various software development techniques.
Step #2– Develop the test cases and execute them.
Types of White Box Testing
White box testing includes various types of testing, some of them are:
Techniques of White Box Testing
These techniques do not find bugs in the code but detect the path, statements, and branches that are not covered during testing.
White Box Testing Example
Let us consider the following code snippet:
INPUT A & B
C = A + B
PRINT “ITS DONE”
Now in the first, line, we assign the value of A and B. Let us suppose A = 60 and B = 50. Moving on to the second line, now C is assigned a value of A+B, here A = 60 and B = 50, hence C = 110. Moving on to the third line, we will check if C > 100, here the condition is true and hence we should get our result as ITS DONE
White Box Testing Tools
Veracode is a prominent toolkit that helps in identifying and resolving the defects quickly, economically and easily. It supports various programming languages like .NET, C++, JAVA, etc. It also supports security testing.
EclEmma is a free Java code coverage tool. It has various features that ease the testing process. It is widely used by the testers to conduct white box testing on their code.
It is free to use tool for testing C programs.
It is a framework for testing C/C++ codes. It makes the complete process of developing test suites simple and easy. It is specifically designed for NT Kernel mode and Win32.
This C++ test framework by Google has an extensive list of features including test Discovery, Death tests, Value-parameterized tests, fatal & non-fatal failures, XML test report generation, etc. It supports various platforms like Linux, Windows, Symbian, Mac OS X, etc.
A perfect tool for programs based on JAVA code. It comes with various useful features to assists testers in testing their code.
The list doesn’t end here. However, listed here are the most used/prominent ones.
Advantages of White Box Testing
Disadvantages of White Box Testing
White box testing is a predominantly used software testing technique. It is based on evaluating the code to test which line of the code is causing the error. The process requires good programming language skills and is generally carried out by both developers and testers.
White box testing is used to test the internal structure, design and implementation capability etc.
You can use white box testing as a method for code optimization. test case automation, test path coverage etc.
In white box testing coding of the software along with flow of outputs and inputs in a system can be tested
Types of white box testing include, unit testing, memory leak testing, penetration testing, code efficiency testing and mutation testing
Since test of coding is involved developers are mostly relied on when it comes to white box testing. However, testers with programming language can also perform the process.