TriangleChecker/test/TriangleCheckerTest.java

import org.junit.Test;
import static org.junit.Assert.*;

public class TriangleCheckerTest {

    @Test
    public void testIsTriangle() {

        // Arrange
        float a = 3;
        float b = 2;
        float c = 4;

        // Act
        TriangleChecker.TriangleType type = TriangleChecker.checkTriangle(a, b, c);

        // Assert
        assertEquals(TriangleChecker.TriangleType.NORMAL, type);

        // Arrange
        a = -2;
        b = 5;
        c = 2;

        // Act
        type = TriangleChecker.checkTriangle(a, b, c);

        // Assert
        assertEquals(TriangleChecker.TriangleType.NONE, type);

        // Arrange
        a = 5;
        b = 5;
        c = 10;

        // Act
        type = TriangleChecker.checkTriangle(a, b, c);

        // Assert
        assertEquals(TriangleChecker.TriangleType.NONE, type);
    }

    @Test
    public void testIsoTriangle(){
        // Arrange
        float a = 6;
        float b = 6;
        float c = 3;

        // Act
        TriangleChecker.TriangleType type = TriangleChecker.checkTriangle(a, b, c);

        // Assert
        assertEquals(TriangleChecker.TriangleType.ISOSCELES, type);
    }

    @Test
    public void testEqualTriangle(){
        // Arrange
        float a = 5;
        float b = 5;
        float c = 5;

        // Act
        TriangleChecker.TriangleType type = TriangleChecker.checkTriangle(a, b, c);

        // Assert
        assertEquals(TriangleChecker.TriangleType.EQUILATERAL, type);
    }

}