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Question 1

I know the difference between unit testing, integration testing, A/B testing

Answer 1

• unit testing: refers to the practice of testing certain functions and areas – or units – of our code. This gives us the ability to verify that our functions work as expected. That is to say that for any function and given a set of inputs, we can determine if the function is returning the proper values and will gracefully handle failures during the course of execution should invalid input be provided.
• integration testing: Integration Testing is a level of software testing where individual units are combined and tested as a group. The purpose of this level of testing is to expose faults in the interaction between integrated units.
• A/B testing: is a controlled experiment with two variants, A and B