diff --git a/src/test_/java/CollisionCheckerTest.java b/src/test_/java/CollisionCheckerTest.java
index 788700b..0f4dfd5 100644
--- a/src/test_/java/CollisionCheckerTest.java
+++ b/src/test_/java/CollisionCheckerTest.java
@@ -74,4 +74,15 @@ public class CollisionCheckerTest {
         //assert
         assertFalse(result);
     }
+    @Test
+    void WhenBallXCoordinateIsLessOrEqualThanZero_didTouchLeftEdge_ReturnsTrue() {
+        // arrange
+        Integer ballXCoordinate = -5;
+
+        //act
+        Boolean result = collisionChecker.didTouchLeftEdge(ballXCoordinate);
+
+        //assert
+        assertTrue(result);
+    }
 }