all checks okay

src/Praktikum02/TriangleChecker.java

   public static TriangleType checkTriangle(float a, float b, float c) {
 
     if(a + b > c && a + c > b && b + c > a){
+      if (a == b  && b == c){
+        return TriangleType.EQUILATERAL;
+      }
       if (a == b || b == c || a == c){
         return TriangleType.ISOSCELES;
       }

test/Praktikum02/TriangleCheckerTest.java

     void checkTriangleISOSCELES(){
         assertEquals(TriangleChecker.TriangleType.ISOSCELES,TriangleChecker.checkTriangle(6,6, 2));
     }
+
+    @Test
+    void checkTriangleEQUILATERAL(){
+        assertEquals(TriangleChecker.TriangleType.EQUILATERAL,TriangleChecker.checkTriangle(6,6, 6));
+    }
+
+    @Test
+    void checkTriangleANegativ(){
+        assertEquals(TriangleChecker.TriangleType.NONE,TriangleChecker.checkTriangle(-6,6, 6));
+    }
+    @Test
+    void checkTriangleBNegativ(){
+        assertEquals(TriangleChecker.TriangleType.NONE,TriangleChecker.checkTriangle(6,-6, 6));
+    }
+    @Test
+    void checkTriangleCNegativ(){
+        assertEquals(TriangleChecker.TriangleType.NONE,TriangleChecker.checkTriangle(6,6, -6));
+    }
+
+    @Test
+    void checkTriangleAToLong(){
+        assertEquals(TriangleChecker.TriangleType.NONE,TriangleChecker.checkTriangle(36,6, 6));
+    }
+    @Test
+    void checkTriangleBToLong(){
+        assertEquals(TriangleChecker.TriangleType.NONE,TriangleChecker.checkTriangle(6,46, 6));
+    }
+    @Test
+    void checkTriangleCToLong(){
+        assertEquals(TriangleChecker.TriangleType.NONE,TriangleChecker.checkTriangle(6,6, 56));
+    }
 }