Junit-3

TestCase- class should be inherited for the test case class where all the method starts 

with testX(),testY()

TestSuite- class should be inherited 

public class XTest extends TestCase {

    public File file;

    public XTest(File file) {

           super(file.toString());

           this.file = file;

    }

    public void testX() {

           fail("Failed: " + file);

    }

}

public class XTestSuite extends TestSuite {

    public static Test suite() {

           TestSuite suite = new TestSuite("XTestSuite");

           File[] files = new File(".").listFiles();

           for (File file : files) {

                       suite.addTest(new XTest(file));

           }

           return suite;

    }

}