How to run

mvn install
mvn compile exec:java -Dexec.mainClass="com.ramprasadg.generic.ArrayRotation"  

How to run unit tests

#runs specific test files
mvn test -Dtest=TestMyComparator test

#runs all test files
mvn test

for more refer https://mkyong.com/maven/how-to-run-unit-test-with-maven/