what is unit testing code example

Example 1: what is unit testing

UNIT TESTING is a  software testing where individual
units or components of a software are tested.
The purpose is to validate that each unit of the 
software performs as designed.

Example 2: Unit Testing

It is part of the white box testing.
It’s done by the developers before 
they deploy the code from Development 
environment to QA environment. 
• Since it is performed by developers, 
I have never done unit testing yet. 
But I think I can learn it and do it if it is needed

Example 3: what is component testing

Testing each component of the application
separately. In application it could be
one component. One component has
stand-alone functionality.
Ex. in amazon.com Seller functionality
can be one component. Buyer can be another
component. Also, Amazon prime videos
can be another component.

Example 4: what is a unit testable code

public class SomeClass
{
    public SomeClass(calculatedParams)
    {
        ...
    }
}

    public interface ISomeClassCreator
    {
        SomeClass Create(params);
    }

public class SomeClassCreator: ISomeClassCreator
{
    public SomeClass Create(params)
    {
        ...
    }
}