diff --git a/src/test_/java/CollisionCheckerTest.java b/src/test_/java/CollisionCheckerTest.java
index 78b955d..f262ff7 100644
--- a/src/test_/java/CollisionCheckerTest.java
+++ b/src/test_/java/CollisionCheckerTest.java
@@ -1,2 +1,26 @@
+import PingPong.CollisionChecker;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+
 public class CollisionCheckerTest {
+    CollisionChecker collisionChecker;
+    @BeforeEach
+    public void before() {
+        CollisionChecker collisionChecker = new CollisionChecker();
+    }
+    @Test
+    void WhenBallYCoordinateIsLessOrEqualThanZero_didTouchTopOrBottomEdge_ReturnsTrue() {
+        // arrange
+        Integer ballYCoordinate = -1;
+        Integer maxHeight = 123;
+
+        // act
+        Boolean result = collisionChecker.didTouchTopOrBottomEdge(ballYCoordinate, maxHeight);
+
+        //assert
+        assertTrue(result);
+    }
 }