diff --git a/src/test/java/CalculationsTest.java b/src/test/java/CalculationsTest.java
index 6586f94..634a972 100644
--- a/src/test/java/CalculationsTest.java
+++ b/src/test/java/CalculationsTest.java
@@ -32,5 +32,8 @@ public class CalculationsTest {
         assertEquals(24, fact.calculateFactorial(4));
         assertEquals(120, fact.calculateFactorial(5));
 
+        // Test with large number
+        assertEquals(3628800, fact.calculateFactorial(10));
     }
 }
+