What is White Box Testing?
The White Box Testing is a type of testing technique that mainly examines program structure and derives test data on basis of program logic or code. White box testing also referred to names like clear box testing, open box testing, logic driven testing or path driven testing or structural testing.
How Does White Box Testing Work?
The steps for White Box Testing mentioned as following in a specific order –
- Firstly all feature, components, and programs to be tested, identified first.
- Create a flow graph and identify /plot all possible paths in the flow graph.
- Identification of all possible paths from the flow graph.
- Write test cases for every single path of the flow path.
- Execute, rinse and repeat test cases.
Benefits of White Box Testing
Benefits of White Box testing explained in the following manner –
- Required knowledge of the internals of the software under test to be tested.
- It allows a finding of hidden errors, to find internal errors because it checks and works by internal functionality.
- It helps to find issues and optimize code to adopt different techniques of White Box Testing to test a developed application or website.
- It requires internal knowledge to do testing that’s why it helps in maximum coverage of code.
Why White Box Testing Matters?
White Box Testing is essential because it helps to test following –
- It is executed at different levels such as system, integration and unit level of software development.
- One primary goal of White Box Testing is to verify the working of an application.
- It involves the identification of the working flow of an application.
- It involves testing a series of predefined inputs against expected or desired outputs so that specific input does not result in the expected output, then the bug obtained and to work on those bugs.
- The functionality of conditional loops.
- Testing each statement.
- Testing of each object.
- Testing of function individually.
- Detection of Internal Security holes.
- Broken or poorly structured paths in a coding process.
- The flow of specific inputs through a code.
- It is executed at early stages and does not wait for GUI(Graphical User Interface) availability.
- Testing is done in such a way that it covers most of the paths.
How to Adopt White Box Testing?
White Box testing executed on the basis of the different type of coverage explained as following. There is a need to adopt one type of coverage depending on are requirements.
Different paths tested with White Box Testing mentioned as following –
Statement Coverage – It is a type of testing technique that tests all the defined programming statements.
Branch Coverage – It is a type of testing technique that ensures that all branches tested at least once.
Path Coverage – It is a testing technique that corresponds to the testing of all possible paths, covering each statement and branch.
Statement Testing = (Number of Statements Exercised / Total Number of Statements) x 100 %
Branch Testing = (Number of decisions outcomes tested / Total Number of decision Outcomes) x 100 %
Path Coverage = (Number paths exercised / Total Number of paths in the program) x 100 %
The above-mentioned formula determines the number of test plans and test cases executed for testing of component or application.
Best Practises of White Box Testing
To execute a White Box Testing in a good way requires execution at different levels. It is considered as one main benefit of White Box Testing because this feature is missing in a Black Box Testing.
Different levels at which White Box Testing executed explained as follows –
- Unit Testing – It is executed to test paths within a unit.
- Integration Testing – It is the testing of paths between units.
- System Testing – It test paths within an application.
White Box Testing Tools
Tools for automation of White Box Testing –
Concluding White Box Testing
White box testing helps in the testing of the application at unit, integration and system level. It also helps to verification of logical conditions and its values in the form of correct/false result values. It also helps to verify all independent paths within a module by using different techniques that are available under white box testing techniques. It helps to detect loops are optimum, and there are no extra looping works under a specified area or functionality.
The main benefit of this is that it helps to find the bugs at different levels and the errors named as a code syntax error, logical errors in code; Data flow errors and conditional errors. White Box Testing it works on an internal level and also helps to find bugs at a profound level.