diff --git a/test/Prak1/TriangleCheckerTest.java b/test/Prak1/TriangleCheckerTest.java
index 1c66b06..5e55921 100644
--- a/test/Prak1/TriangleCheckerTest.java
+++ b/test/Prak1/TriangleCheckerTest.java
@@ -14,4 +14,8 @@ class TriangleCheckerTest {
     void checkTriangle_gleichseitig () {
         assertEquals(TriangleChecker.TriangleType.EQUILATERAL, TriangleChecker.checkTriangle(10, 10, 10));
     }
+    @Test
+    void checkTriangle_none() {
+        assertEquals(TriangleChecker.TriangleType.NONE, TriangleChecker.checkTriangle(-10, 0, 10));
+    }
 }
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