Writing a custom JUnit runner for running a single method using command line

Recently I needed to create a custom JUnit runner for executing a single method using the command line.  This is how I implemented that.


package testpackage;

import org.junit.internal.TextListener;
import org.junit.runner.JUnitCore;
import org.junit.runner.Request;
import org.junit.runner.Result;
import org.junit.runner.notification.RunListener;

public class SingleJUnitTestRunner {

    /**
     * Custom built junit runner for running single method.
     * Usage:
     * java -cp ...... testpackage.SingleJUnitTestRunner testpackage.TestClass#testMethod
     */
    public static void main(String... args) throws ClassNotFoundException {
        if (args.length == 0){
            System.out.println("Usage:");
            System.out.println("java -cp ...... testpackage.SingleJUnitTestRunner testpackage.TestClass#testMethod");
            System.exit(-1);
        }
        String[] classAndMethod = args[0].split("#");

        if (classAndMethod .length != 0){
            System.out.println("Usage:");
            System.out.println("java -cp ...... testpackage.SingleJUnitTestRunner testpackage.TestClass#testMethod");
                     System.exit(-1);
        }
        System.out.println("======================================");
        System.out.println("Test Execution started for " + classAndMethod[1] + " method in class " + classAndMethod[0] + ".");
        System.out.println("=====================================");


        Request request = Request.method(Class.forName(classAndMethod[0]),
                classAndMethod[1]);
        JUnitCore core = new JUnitCore();
        // Use the text listener to get the output from test cases to console
        RunListener listener= new TextListener(System.out);
        core.addListener(listener);
        Result result = core.run(request);


        System.out.println("RunCount: " + result.getRunCount());
        System.out.println("FailureCount: " + result.getFailureCount());
        System.out.println("IgnoreCount: " + result.getIgnoreCount());
        System.exit(result.wasSuccessful() ? 0 : -1);
    }

}