"Gleichschenklig" eingefügt und positiver Test

src/TriangleChecker.java

   public static TriangleType checkTriangle(float a, float b, float c) {
 
     if (a+b>c || b+c>a || a+c>b) {
+
+      if (a == b || a == c || b == c) {
+        return TriangleType.ISOSCELES;
+      }
       return TriangleType.NORMAL;
     }
-      return TriangleType.NONE;
+    return TriangleType.NONE;
   }
 }

test/TriangleCheckerTest.java

 
         // Arrange
         float a = 2;
-        float b = 3;
+        float b = 2;
         float c = 4;
 
         // Act
         TriangleChecker.TriangleType type = TriangleChecker.checkTriangle(a, b, c);
 
         // Assert
-        assertEquals(TriangleChecker.TriangleType.NORMAL, type);
+        assertEquals(TriangleChecker.TriangleType.ISOSCELES, type);
 
     }