Unit Testing and Its Techniques

 What is Unit Or Component Testing :

• Unit testing is a software development process in which  individual units of source code , sets of one or more computer program modules are tested to determine whether they are fit for use or not. 
• Testing is conduct by developer or white box tester.
• To conduct this testing programming knowledge is required. 
• This technique allows developers to analyze code, catch bugs earlier, and fix them faster.

Levels of Software Testing:

Advantages of Unit Testing 

• Unit testing significantly improves code quality. 
• Unit testing helps identify all kinds of issues with the software at a very early stage.
• If there are any problems, they are detected early on and making changes to the system thus becomes much easier.
• Reduce Costs

Unit Testing Techniques

• Structural Testing Techniques
• Functional Testing 
• Error Based Testing Techniques 

1. Structural Testing Techniques

Structure-based testing techniques use the internal structure of a software to derive test cases. It is a white box testing technique it required programming skills

Structure-based techniques can also be used at all levels of testing

•  Statement Testing :- Testing each line in programming at least one time.
•  Condition Testing:- Verify the conditional statement are working correct or not.
•  Branch Testing:- Verify all the branch statement are working correct.
•  Path Testing:- Testing the flow of the execution of the program. 

2. Functional Testing 

• FUNCTIONAL TESTING is a type of software testing whereby the system is tested against the functional requirements
•  Functions (or features) are tested by feeding them input and examining the output.
•  Functional testing ensures that the requirements are properly satisfied by the application.
•  Functional testing is a quality assurance process and a type of black-box testing.

3. Error Guessing Testing Techniques 

• Error Guessing is a Software Testing technique on guessing the error which can prevail in the code.
• It is a black box testing.
• Error guessing is a technique in which there is no specific method for identifying the error. It is based on the experience of the test analyst
• Testing is conducted to analyses the impact of the defect on the application.

Please refer below video for more detail on Unit testing: