diff --git a/feeCalculator/src/test/java/org/example/FeeCalculatorTest.java b/feeCalculator/src/test/java/org/example/FeeCalculatorTest.java
index b8648d9..f75372f 100644
--- a/feeCalculator/src/test/java/org/example/FeeCalculatorTest.java
+++ b/feeCalculator/src/test/java/org/example/FeeCalculatorTest.java
@@ -7,8 +7,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 
 class FeeCalculatorTest {
     @Test
-    public void for_age_under_14_HALF_DAY_should_calculate_20()
-    {
+    public void for_age_under_14_HALF_DAY_should_calculate_20() {
         //GIVEN
         Visitor child = new Visitor(10);
 
@@ -20,8 +19,7 @@ class FeeCalculatorTest {
     }
 
     @Test
-    public void for_age_under_14_FULL_DAY_should_calculate_50()
-    {
+    public void for_age_under_14_FULL_DAY_should_calculate_50() {
         //GIVEN
         Visitor child = new Visitor(10);
 
@@ -33,8 +31,7 @@ class FeeCalculatorTest {
     }
 
     @Test
-    public void for_age_above_14_HALF_DAY_should_calculate_60()
-    {
+    public void for_age_above_14_HALF_DAY_should_calculate_60() {
         //GIVEN
         Visitor adult = new Visitor(20);
 
@@ -46,8 +43,7 @@ class FeeCalculatorTest {
     }
 
     @Test
-    public void for_age_above_14_FULL_DAY_should_calculate_120()
-    {
+    public void for_age_above_14_FULL_DAY_should_calculate_120() {
         //GIVEN
         Visitor adult = new Visitor(20);
 
@@ -57,4 +53,28 @@ class FeeCalculatorTest {
         //THEN
         assertThat(actualFee).isEqualTo(120.0);
     }
+
+    @Test
+    public void for_age_under_14_invalid_ticket_should_throw_error() {
+        //GIVEN
+        Visitor child = new Visitor(10);
+
+        //WHEN
+        assertThrows(
+                IllegalArgumentException.class,
+                () -> FeeCalculator.calculateFee(child, TicketType.WEEK)
+        );
+    }
+
+    @Test
+    public void for_age_above_14_invalid_ticket_should_throw_error() {
+        //GIVEN
+        Visitor child = new Visitor(20);
+
+        //WHEN
+        assertThrows(
+                IllegalArgumentException.class,
+                () -> FeeCalculator.calculateFee(child, TicketType.WEEK)
+        );
+    }
 }
\ No newline at end of file