tests harness' handling of code calling System.exit

tests/harness/systemExit/SystemExit.java

+
+public class SystemExit {
+
+    /**
+     * Exit via System.exit(int);
+     * @param args null/empty String[], or integer exit value in args[0]
+     * @throws Exception
+     */
+    public static void main(String[] args) throws Exception {
+        int result = 0;
+        if ((null != args) && (0 < args.length)) {
+            result = Integer.valueOf(args[0]).intValue();
+        }
+        System.exit(result);
+    }
+}