[testing] restore the printing of the actual/expected when tests fail.

src/delombok/lombok/delombok/PrettyPrinter.java

@@ -278,7 +278,6 @@ public class PrettyPrinter extends JCTree.Visitor {
 		aligned = false;
 	}
 	
-	
 	private void println() {
 		try {
 			out.write(LINE_SEP);

src/support/lombok/ant/SimpleTestFormatter.java

@@ -42,13 +42,15 @@ public class SimpleTestFormatter implements JUnitResultFormatter {
     }
 
     @Override
-    public void setSystemError(String err) {
-        // don't echo test error output
+    public void setSystemError(String msg) {
+        if (msg.trim().isEmpty()) return;
+        out.println(msg);
     }
 
     @Override
-    public void setSystemOutput(String out) {
-        // don't echo test output
+    public void setSystemOutput(String msg) {
+        if (msg.trim().isEmpty()) return;
+        out.println(msg);
     }
 
     @Override