To run from cmd line:
run shell script validate_approvals --approvers <names> --changed-files <files>

e.g:
sh validate_approvals --approvers alovelace,ghopper --changed-files src/com/twitter/follow/Follow.java,src/com/twitter/user/User.java

Files:
Validate.java: contains main logic for validating approvals
Helper.java: helper class for maintaining owner and dependency properties
TestSuite.java: Junit test suite class
TestValidate.java: Individual test cases

To run tests from cmd line:
javac -cp libs/junit-4.13.2.jar:libs/commons-collections4-4.4.jar:libs/hamcrest-core-1.3.jar TestValidate.java Validate.java Helper.java
java -cp .:libs/junit-4.13.2.jar:libs/commons-collections4-4.4.jar:libs/hamcrest-core-1.3.jar org.junit.runner.JUnitCore TestValidate

Jenkins:
Included video of local jenkins server kicking off Junit tests