Update DecoratorPatternTest.java

Author: Deepak-Vohra

core-java-modules/core-java-lang-oop-patterns-2/src/test/java/com/baeldung/overridemethod/decorator/DecoratorPatternTest.java

@@ -12,5 +12,6 @@ void testDecoratorWrapping() {
         Calculator simpleCalc = new SimpleCalculator();
         Calculator decoratedCalc = new LoggingCalculatorDecorator(simpleCalc);
         assertEquals(15, decoratedCalc.add(10, 5));
+        assertEquals(5, decoratedCalc.subtract(10, 5));
     }
 }