Java: Open Source Mocking Framework

JMock is a library that supports test-driven development of Java code with mock objects.

Mock objects help you design and test the interactions between the objects in your programs.

The jMock library:

1.makes it quick and easy to define mock objects, so you don’t break the rhythm of programming.
2.lets you precisely specify the interactions between your objects, reducing the brittleness of your tests.
3.works well with the autocompletion and refactoring features of your IDE plugs into your favourite test framework is easy to extend.

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Open Source Java ByteCode Library

ASM is an all purpose Java bytecode manipulation and analysis framework. It can be used to modify existing classes or dynamically generate classes, directly in binary form. Provided common transformations and analysis algorithms allow to easily assemble custom complex transformations and code analysis tools.

The ASM bytecode manipulation framework has been designed and implemented to be small and as fast as possible. ASM’s runtime .jar is only 25KB, compared to 350KB for BCEL. The load time overhead caused by class transformation with ASM is about 60 percent with ASM, compared to 700 percent or more with BCEL. These factors have been recognized by the Java community and several well known projects have switched to ASM, such as CGLIB and AspectWerkz. The list of projects that are using form the beginning ASM also includes Speedo, Groovy, dynaop,BeanShell, and a number of others.

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