modified case detections in the main program, created tests

test/TriangleCheckerTest.java

@@ -2,21 +2,51 @@ import org.junit.Test;
 import static org.junit.Assert.*;
 
 public class TriangleCheckerTest {
-    
+
+    // Arrange
+    float a = 2;
+    float b = 3;
+    float c = 4;
+    float d = - a;
+
+    TriangleChecker.TriangleType none = TriangleChecker.TriangleType.NONE;
+    TriangleChecker.TriangleType normal = TriangleChecker.TriangleType.NORMAL;
+    TriangleChecker.TriangleType isosceles = TriangleChecker.TriangleType.ISOSCELES; // Gleichschenklig
+    TriangleChecker.TriangleType equilateral = TriangleChecker.TriangleType.EQUILATERAL; // Gleichseitig
+
+
     @Test
     public void testValidTriangle() {
 
-        // Arrange
-        float a = 2;
-        float b = 3;
-        float c = 4;
-
-        // Act
-        TriangleChecker.TriangleType type = TriangleChecker.checkTriangle(a, b, c);
-
-        // Assert
-        assertEquals(TriangleChecker.TriangleType.NORMAL, type);
+        assertTrue(TriangleChecker.checkTrianglePossible(a,b,c));
+        assertFalse(TriangleChecker.checkTrianglePossible(0,0,0));
+        assertFalse(TriangleChecker.checkTrianglePossible(0,b,c));
+        assertFalse(TriangleChecker.checkTrianglePossible(a,0,c));
+        assertFalse(TriangleChecker.checkTrianglePossible(a,b,0));
 
+        //combination of falses
+        assertFalse(TriangleChecker.checkTrianglePossible(d,c,c));
+        assertFalse(TriangleChecker.checkTrianglePossible(0,0,c));
+        assertFalse(TriangleChecker.checkTrianglePossible(d,d,d));
+        assertFalse(TriangleChecker.checkTrianglePossible(a,b,0));
     }
 
+    @Test
+    public void testTriangleType(){
+
+        assertEquals(none, TriangleChecker.checkTriangle(a, b, 400));
+
+        assertEquals(normal, TriangleChecker.checkTriangle(a, b, c));
+
+        assertEquals(isosceles, TriangleChecker.checkTriangle(a, b, b));
+        assertEquals(isosceles, TriangleChecker.checkTriangle(a, a, c/3));
+        assertEquals(isosceles, TriangleChecker.checkTriangle(c, b, c));
+        assertNotEquals(isosceles, TriangleChecker.checkTriangle(a, b, c));
+        assertNotEquals(isosceles, TriangleChecker.checkTriangle(a, a, a));
+
+        assertNotEquals(equilateral, TriangleChecker.checkTriangle(b, a, a));
+        assertEquals(equilateral, TriangleChecker.checkTriangle(a, a, a));
+        assertNotEquals(equilateral, TriangleChecker.checkTriangle(a, b, a));
+        assertNotEquals(equilateral, TriangleChecker.checkTriangle(a, a, b));
+    }
 }