Test Delta Class

testDelta.java

package tests;

import delta.Delta;
import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.*;

/**
 * Created by efik
 * on 12.01.16.
 */
public class DeltaTest {

    private Delta delta;

    @Before
    public void setUp() throws Exception {
        this.delta = new Delta();
    }

    @Test(expected = Exception.class)
    public void test_sumy_pierwiastkow_delta_mniejsza_od_zera() throws Exception {
        this.delta.oblicz(1, -5, 22);
    }

    @Test
    public void test_sumy_pierwiastkow_delta_wieksza_od_zera() throws Exception {
        assertEquals(3, this.delta.oblicz(1, -3, -4), 0);
        assertEquals(-2, this.delta.oblicz(-1, -2, 0), 0);
        assertEquals(0, this.delta.oblicz(-1, 0, 5), 0);
        assertEquals(-0.3, this.delta.oblicz(10, 3, -4), 0);

    }

    @Test
    public void test_sumy_pierwiastkow_delta_rowna_zeru() throws Exception {
        assertEquals(3, this.delta.oblicz(1, -6, 9), 0);
        assertEquals(-2, this.delta.oblicz(1, 4, 4), 0);
    }

    @Test(expected = Exception.class)
    public void test_sumy_pierwiastkow_gdy_podamy_a() throws Exception {
        this.delta.oblicz(0, -5, 22);
    }
}