PMD rule test classes source for benchmarking

Are there any test classes where PMD rule can be tested ? Basically i want to benchmark some other tool again PMD's basic rule set. Like PMd must be testing its rule against some te开发者_运维知识库st code..

I dugg through PMD source but could not figure out where such classes are.

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The rule guidelines page describes the -benchmark flag where you can see how long a rule takes against given source code - they suggest the JDK code itself.