src/checkstyle/checkstyleTest.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN" "https://checkstyle.org/dtds/configuration_1_3.dtd">
<module name="Checker">
	<property name="severity" value="error" />

	<module name="TreeWalker">
		<module name="SuppressWarningsHolder" />
		<module name="UnusedImports">
			<property name="processJavadoc" value="true" />
		</module>
		<module name="AvoidStarImport"/>
		<module name="IllegalImport">
			<property name="illegalPkgs" value="org.jetbrains.annotations" />
		</module>
	</module>

	<module name="SuppressWarningsFilter" />

	<module name="RegexpSingleline">
		<property name="format" value="@author" />
		<property name="message" value="Don't use Javadoc @author tags" />
		<property name="fileExtensions" value="java,groovy,kt" />
	</module>

</module>