diff --git a/app/src/test/java/com/coderabbit/app/ExampleUnitTest.java b/app/src/test/java/com/coderabbit/app/ExampleUnitTest.java
index 4740838..06b5a39 100644
--- a/app/src/test/java/com/coderabbit/app/ExampleUnitTest.java
+++ b/app/src/test/java/com/coderabbit/app/ExampleUnitTest.java
@@ -14,4 +14,9 @@ public class ExampleUnitTest {
     public void addition_isCorrect() {
         assertEquals(4, 2 + 2);
     }
+
+    @Test
+    public void addition_isFalse() {
+        assertTrue(true);
+    }
 }
\ No newline at end of file
diff --git a/app/src/test/java/com/coderabbit/app/calculator/CalculatorTest.kt b/app/src/test/java/com/coderabbit/app/calculator/CalculatorTest.kt
index 0ef6ff3..8084f43 100644
--- a/app/src/test/java/com/coderabbit/app/calculator/CalculatorTest.kt
+++ b/app/src/test/java/com/coderabbit/app/calculator/CalculatorTest.kt
@@ -48,4 +48,12 @@ class CalculatorTest {
             calculator.divide(17,0)
         }
     }
+
+    @Test
+    fun `test divide function che divide zero by twenty`() {
+        val calculator = Calculator()
+        assertThrows(ArithmeticException::class.java){
+            calculator.divide(20,0)
+        }
+    }
 }
\ No newline at end of file