February 22, 2009

Explain Unit Testing, Interface Testing and Integration Testing. Also explain the types of Integration Testing in brief.

Unit Testing

Unit Testing is done to check whether the individual modules of the source code is working properly. i.e Testing each and every unit of the application separately by the developer in developers environment.

Interface Testing

Interface Testing is done to check whether the individual modules are communicating properly one among other as per the specifications.

Interface Testing is mostly used in testing the user interface of GUI applications.

Integration Testing

Integration Testing is done to check the connectivity by combining all the individual modules together and test the functionality.

The types of Integration Testing are,

1) Big Bang Integration Testing

In Big Bang Integration Testing, the individual modules are not integrated until all the modules are ready. Then they will run to check whether it is performing well.

In this type of testing, some disadvantages might occur like,

Defects can be found at the later stage.

It would be difficult to find out whether the defect arouse in Interface or in module.

2) Top Down Integration Testing

In Top Down Integration Testing, the high level modules are integrated and tested first. i.e Testing from main module to sub module. In this type of testing, Stubs are used as temporary module if a module is not ready for integration testing.

3) Bottom Up Integration Testing

In Bottom Up Integration Testing, the low level modules are integrated and tested first i.e Testing from sub module to main module. Same like Stubs, here drivers are used as a temporary module for integration testing.


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31 Comments:

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very nice...... Thanks alot

12:32 PM  
Blogger Quality Assurance said...

Read all the related Posts:

64 Software Manual Testing Interview Questions

Answers To Common Job Interview Questions

Behavioral Questions In Interviews

Questions to Ask at an Interview

Competency based Interview Questions

9:08 PM  
Blogger SoftwareQATestings.com said...

Here is one more example on this:Test cases for input box which accepts numbers between 1 and 100 using Boundary value analysis:Test cases with test data exactly as the input boundaries of input domain i.e. values 1 and 100 in our case.Test data with values just below the extreme edges of input domains i.e. values 0 and 99.Test data with values just above the extreme edges of input domain i.e. values 2 and 101.

For more examples visit 5 Boundary Value Analysis Examples

Thanks Dav

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Blogger SoftwareQATestings.com said...

Writing test cases is one of the major and most important activities which any tester performs during the entire testing cycle. The approach for writing good test cases will be to identify, define and analyse the requirements.
When you begin writing the test cases, there are few steps which you need to follow to ensure that you are writing good test cases

If you are interested then also go through the following article to check a step by step approach to write a good test case:

How to write a good test case?

9:42 PM  
Blogger SoftwareQATestings.com said...

If by STLC you mean Software Testing Life Cycle, the domain is very broad.

The typical steps of STLC are:
- Pinpointing Requirements and creating Use Case Documents
- Defining a Test Plan
- Defining Test Cases
- Executing Test Cases
- Bug Analysis and Reporting
- Retesting the reported bugs, after bug fixing sessions.

It's about defining interaction scenarios from the point of view of the future user(s), performing walk-troughs and reporting possible problems to the development team(s), in a structured standardized manner.

The requirements analysis is actually a part of the Software Development Life cycle, but is required in the testing stage.
Links:
What is the difference between SDLC and STLC?

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