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Pmdtester is a regression testing tool that ensures no new problems and unexpected behaviors will be introduced to PMD after fixing an issue. It can also be used to verify, that new rules work as expected. It has been integrated into travis CI and is actually used automatically for PRs. Regression difference reports are commented back to the PR for the reviewer’s information e.g. https://github.com/pmd/pmd/pull/1265#issuecomment-408945709

Run pmdtester locally

Install pmdtester

gem install pmdtester --pre

Verifying your local changes and generate a diff-report locally


The regression difference report is placed in the YOUR_WORKING_DIR/target/reports/diff directory.

For more documentation on pmdtester, see README.rdoc

Tags: devdocs