Added isEquilateral, isIsosceles, and isScalene, and updated tests

exercises/triangle/.meta/src/reference/java/Triangle.java

     private double side1;
     private double side2;
     private double side3;
+    private int uniqueSides;
 
     Triangle(double side1, double side2, double side3) throws TriangleException {
         this.side1 = side1;
         if (allSidesAreZero() || hasImpossibleSides() || violatesTriangleInequality()) {
             throw new TriangleException();
         }
-    }
 
-    TriangleKind getKind() {
-        int uniqueSides = getNumberOfUniqueSides();
+        this.uniqueSides = getNumberOfUniqueSides();
+    }
 
-        if (uniqueSides == 1) {
-            return TriangleKind.EQUILATERAL;
-        }
+    private boolean isEquilateral() {
+        return uniqueSides == 1;
+    }
 
-        if (uniqueSides == 2) {
-            return TriangleKind.ISOSCELES;
-        }
+    private boolean isIsosceles() {
+        return uniqueSides == 2;
+    }
 
-        return TriangleKind.SCALENE;
+    private boolean isScalene() {
+        return uniqueSides == 3;
     }
 
     private boolean allSidesAreZero() {

exercises/triangle/src/test/java/TriangleTest.java

     public void equilateralTrianglesHaveEqualSides() throws TriangleException {
         Triangle triangle = new Triangle(2, 2, 2);
 
-        assertEquals(TriangleKind.EQUILATERAL, triangle.getKind());
+        assertEquals(true, triangle.isEquilateral());
     }
 
     @Ignore("Remove to run test")
     public void largerEquilateralTrianglesAlsoHaveEqualSides() throws TriangleException {
         Triangle triangle = new Triangle(10, 10, 10);
 
-        assertEquals(TriangleKind.EQUILATERAL, triangle.getKind());
+        assertEquals(true, triangle.isEquilateral());
     }
 
     @Ignore("Remove to run test")
     public void isoscelesTrianglesHaveLastTwoSidesEqual() throws TriangleException {
         Triangle triangle = new Triangle(3, 4, 4);
 
-        assertEquals(TriangleKind.ISOSCELES, triangle.getKind());
+        assertEquals(true, triangle.isIsosceles());
     }
 
     @Ignore("Remove to run test")
     public void isoscelesTrianglesHaveFirstAndLastSidesEqual() throws TriangleException {
         Triangle triangle = new Triangle(4, 3, 4);
 
-        assertEquals(TriangleKind.ISOSCELES, triangle.getKind());
+        assertEquals(true, triangle.isIsosceles());
     }
 
     @Ignore("Remove to run test")
     public void isoscelesTrianglesHaveTwoFirstSidesEqual() throws TriangleException {
         Triangle triangle = new Triangle(4, 4, 3);
 
-        assertEquals(TriangleKind.ISOSCELES, triangle.getKind());
+        assertEquals(true, triangle.isIsosceles());
     }
 
     @Ignore("Remove to run test")
     public void isoscelesTrianglesHaveInFactExactlyTwoSidesEqual() throws TriangleException {
         Triangle triangle = new Triangle(10, 10, 2);
 
-        assertEquals(TriangleKind.ISOSCELES, triangle.getKind());
+        assertEquals(true, triangle.isIsosceles());
     }
 
     @Ignore("Remove to run test")
     public void scaleneTrianglesHaveNoEqualSides() throws TriangleException {
         Triangle triangle = new Triangle(3, 4, 5);
 
-        assertEquals(TriangleKind.SCALENE, triangle.getKind());
+        assertEquals(true, triangle.isScalene());
     }
 
     @Ignore("Remove to run test")
     public void scaleneTrianglesHaveNoEqualSidesAtLargerScaleEither() throws TriangleException {
         Triangle triangle = new Triangle(10, 11, 12);
 
-        assertEquals(TriangleKind.SCALENE, triangle.getKind());
+        assertEquals(true, triangle.isScalene());
     }
 
     @Ignore("Remove to run test")
     public void scaleneTrianglesHaveNoEqualSidesInDescendingOrderEither() throws TriangleException {
         Triangle triangle = new Triangle(5, 4, 2);
 
-        assertEquals(TriangleKind.SCALENE, triangle.getKind());
+        assertEquals(true, triangle.isScalene());
     }
 
     @Ignore("Remove to run test")
     public void verySmallTrianglesAreLegal() throws TriangleException {
         Triangle triangle = new Triangle(0.4, 0.6, 0.3);
 
-        assertEquals(TriangleKind.SCALENE, triangle.getKind());
+        assertEquals(true, triangle.isScalene());
     }
 
     @Ignore("Remove to run test")