diff --git a/src/test/java/org/solovyev/android/calculator/model/CalculatorEngineTest.java b/src/test/java/org/solovyev/android/calculator/model/CalculatorEngineTest.java
index a0b60a47..f8fde86e 100644
--- a/src/test/java/org/solovyev/android/calculator/model/CalculatorEngineTest.java
+++ b/src/test/java/org/solovyev/android/calculator/model/CalculatorEngineTest.java
@@ -109,6 +109,7 @@ public class CalculatorEngineTest {
 		junit.framework.Assert.assertEquals("120", cm.evaluate(JsclOperation.numeric, "(2+2+1)!").getResult());
 		junit.framework.Assert.assertEquals("24", cm.evaluate(JsclOperation.numeric, "(2.0+2.0)!").getResult());
 		junit.framework.Assert.assertEquals("24", cm.evaluate(JsclOperation.numeric, "4.0!").getResult());
+		junit.framework.Assert.assertEquals("720", cm.evaluate(JsclOperation.numeric, "3!!").getResult());
 		junit.framework.Assert.assertEquals("36.0", Expression.valueOf("3!^2").numeric().toString());
 		junit.framework.Assert.assertEquals("3.0", Expression.valueOf("cubic(27)").numeric().toString());
 		try {