TriangleCheckerAssignment/test/TriangleCheckerTest.java

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() {

        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));
    }
}