import junit.framework.TestCase;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;

public class NumberRectangleTest extends TestCase {

    public void test() throws IOException {
        final PrintStream oldSystemOut = System.out;
        final OutputStream outputStream = new ByteArrayOutputStream();
        System.setOut(new PrintStream(outputStream));
        try {

            YourMainClassNameHere.main(new String[0]);

        } finally {
            System.setOut(oldSystemOut);
        }
        outputStream.flush();
        outputStream.close();

        final String NL = System.getProperty("line.separator");
        assertEquals("" +
                        "1 5 9" + NL +
                        "2 6 10" + NL +
                        "3 7 11" + NL +
                        "4 8 12" + NL,
                outputStream.toString());
    }

}