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Message Icon Topic: Separation of Interface from Implementation

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sunita
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Joined: 26Mar2007
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Quote sunita Replybullet Topic: Separation of Interface from Implementation
    Posted: 02Apr2007 at 4:25am
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 finds herself writing 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. This results in loosely coupled code, thus minimizing dependencies in the system



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