You are in the development stage for a new ASP.Net web application, WebPartsToGo. 
Customers of Parts To Go, a national auto parts distribution company, will use the web site. 
As a member of the development team, it is your job to write ASP.Net code and test the web applications you are developing. 
Developers are tasked with testing each individual function and block of code. 

What is this type of testing called?

Unit testing involves testing each piece of code to be sure it works as intended. A product unit is the smallest piece of code that can be tested, independently.