https://github.com/git-commit-id/git-commit-id-maven-plugin/issues/562: move the 'core-tests' from git-commit-id/git-commit-id-maven-plugin@34d3c12af933ba0c0c86142ae9ba5c24d1ec2d25 into here

[TheSnoozer]

git-commit-id/git-commit-id-maven-plugin#562: move the 'core-tests' from git-commit-id/git-commit-id-maven-plugin@34d3c12 into here

Context

Contributor Checklist

• Added relevant integration or unit tests to verify the changes
• Update the Readme or any other documentation (including relevant Javadoc)
• Ensured that tests pass locally: mvn clean package
• Ensured that the code meets the current checkstyle coding style definition: mvn clean verify -Pcheckstyle -Dmaven.test.skip=true -B