CalcTest.java

import static org.junit.Assert.*;

import org.junit.*;

public class CalcTest {
    
    Calc calc;
    
    @Before
    public void setup() {
        System.out.println("1. Setup");
        calc = new Calc();
    }
    
    @Test
    public void sum() {
        System.out.println("2. Exercise - sum()");
        int sum = calc.sum();
        System.out.println("3. Verfiy - sum()");
        assertEquals(0, sum);
    } 
    
    @Test 
    public void addFiveFive() {
        System.out.println("2. Exercise - testAddFiveFive()");
        calc.add(5);
        calc.add(5);
        int sum = calc.sum();
        System.out.println("3. Verfiy - testAddFiveFive()");
        assertEquals(10, sum);
    }
    
    // verify via JUnit runner, 
    // checks the expected IllegalStateException
    @Test(expected = IllegalStateException.class)
    public void addMinusOne() {
        System.out.println("2. Exercise - add Minus One");
        calc.add(-1);
    }
    
    @After
    public void teardown() {
        System.out.println("4. Teardown");
        calc = null;
    }

}