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Unit Testing-Separation of interface from implem.. Printed From: One Stop Testing Category: Types Of Software Testing @ OneStopTesting Forum Name: Unit Testing @ OneStopTesting Forum Discription: Discuss All that is need to be known about Unit Software Testing and its Tools. URL: http://forum.onestoptesting.com/forum_posts.asp?TID=2723 Printed Date: 18Dec2024 at 11:55am Topic: Unit Testing-Separation of interface from implem.. Posted By: tanushree Subject: Unit Testing-Separation of interface from implem.. Date Posted: 08Oct2007 at 12:48am Unit Testing - Separation of interface from implementation Because some classes may have references to other classes, testing a class can frequently spill over into testing another class. A common example of this is classes that depend on a database: in order to test the class, the tester often writes code that interacts with the database. This is a mistake, because a unit test should never go outside of its own class boundary. As a result, the software developer abstracts an interface around the database connection, and then implements that interface with their own mock object. By abstracting this necessary attachment from the code (temporarily reducing the net effective coupling), the independent unit can be more thoroughly tested than may have been previously achieved. This results in a higher quality unit that is also more maintainable. In this manner, the benefits themselves begin returning dividends back to the programmer creating a seemingly perpetual upward cycle in quality.

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