Mock testing

Mocking, or mock testing, is a really well known method in writing unit tests. With "mock" in English is to imitate or replica something, a mock object in programming can be seen as a place holder for another object that has the exact same behavior. With that being said, mocking would enable developers to use the mock object to simulate the real behavior of the real object in order to perform without having to worry about dependencies of the real object.

With a little help from mock frameworks that available for the majority of the languages, mock testings has become easier and more efficient to use. The first type of mock framework is Proxy based frameworks, and it would usually creates a mock object to be called by the test, and it can handle that call by delegate it to the original object, or do operations by itself. This type of frameworks is commonly used as because of its simplicity but still does have its own drawback. For instance, proxy based frameworks can neither be able to intercept static method calls, private method calls, final method call nor build a proxy for a final class. The second type of mock frameworks is classloader mapping as the program would tell the class loader to remap the reference to the class file it loads, so essentially it would load the mock class instead of the actual class.

Article reference can be found here.

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