Difference between white box and black box testing

Software testing can be mainly classified into two - white box testing and black box testing. Most QA engineers do black box testing to certify the product. In interviews, people ask about white box and black box testing, differences, techniques, and all. So it is good to know about definitions and differences between white box and black box testing. Also, we will try to understand this terminology with real-life examples.

I have created a youtube video on our Software testing tips and tricks channel, in which I have discussed

1. White box testing vs Black box testing with examples
2. White box and black box testing techniques
3. Functional vs non-functional testing
4. Advantages and disadvantages of white box and black box testing

So check it out and Don't forget to subscribe to the channel.

White box testing -

is the testing method in which the internal code of the software is tested. The white box itself describes, we understand what is inside box and test it. Ideally while reviewing PRs one should do white box testing.

Who does this?- Mostly developers or SDETs

white box testing techniques -

Condition testing
Data flow testing
Loop testing

Black box testing -

is the testing method in which the functionality of the software is tested without worrying about internal development. As the name suggested it is a black box, so we don't know what is inside it but we can test the use cases of the software.

Who does this? - Mostly QAs

It can be further divided into functional and non-functional testing.

Sanity, smoke, regression, acceptance, etc are functional testing where the functionality of the product is tested whereas load, performance, and security are nonfunctional testing where another nonfunctional strength of the product is tested.

Black box testing techniques -

Boundary Value Analysis
Equivalence partitioning
State Transition Testing
Decision Table Testing
Graph-Based Testing
Error Guessing Technique