Unit Test :: Demo

Money.java

public class Money {
    private int amount;
    private String currency;

    public Money(int amount, String currency) {
        this.amount = amount;
        this.currency = currency;
    }

    public int amount() {
        return amount;
    }

    public String currency() {
        return currency;
    }
}

Money2.java

public class Money {
    private int amount;
    private String currency;

    public Money(int amount, String currency) {
        this.amount = amount;
        this.currency = currency;
    }

    public int amount() {
        return amount;
    }

    public String currency() {
        return currency;
    }

    public Money add(Money money) {
        return new Money(amount() + money.amount(), currency());
    }

}

Money3.java

public class Money {
    
    ...

    public boolean equals(Object anObject) {
        if (anObject instanceof Money) {
            Money money = (Money) anObject;
            return money.currency().equals(currency()) && amount() == money.amount();
        }
        return false;
    }

}

MoneyTest.java

public class MoneyTest {

    @Test
    public void simpleAddWithSameCurrency() {
        //Arrange
        Money money10THB = new Money(10, "THB");
        Money money5THB = new Money(5, "THB");
        Money expectedResult = new Money(15, "THB");
        //Act
        Money actualResult = money10THB.add(money5THB);
        //Assert
        assertTrue(expectedResult.equals(actualResult));
    }

}

MoneyTest2.java

public class MoneyTest {
    
    @Test
    public void equalsMoney() throws Exception {
        Money money10THB = new Money(10, "THB");
        Money money5THB = new Money(5, "THB");
        
        assertTrue(!money10THB.equals(null));
        assertEquals(money10THB, money10THB);
        assertEquals(money10THB, new Money(10, "THB"));
        assertTrue(!money10THB.equals(money5THB));
    }

}

MoneyTest3.java

public class MoneyTest {

    private Money money10THB;
    private Money money5THB;

    @Before
    public void setupFixture() {
        money10THB = new Money(10, "THB");
        money5THB = new Money(5, "THB");
    }

    @Test
    public void simpleAddWithSameCurrency() {
        Money expectedResult = new Money(15, "THB");
        Money actualResult = money10THB.add(money5THB);
        assertTrue(expectedResult.equals(actualResult));
    }

    @Test
    public void equalsMoney() throws Exception {
        assertTrue(!money10THB.equals(null));
        assertEquals(money10THB, money10THB);
        assertEquals(money10THB, new Money(10, "THB"));
        assertTrue(!money10THB.equals(money5THB));
    }

}

Suite.java

@RunWith(Suite.class)
@SuiteClasses({ MoneyTest.class })
public class Group01 {

}


@RunWith(Suite.class)
@SuiteClasses({ MoneyTest2.class, MoneyTest3.class })
public class Group02 {

}