O'Reilly logo

Test Driven Development: By Example by Kent Beck

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 7. Apples and Oranges

$5 + 10 CHF = $10 if rate is 2:1$5 * 2 = $10Make “amount” privateDollar side effects?Money rounding?equals()hashCode()Equal nullEqual object5 CHF * 2 = 10 CHFDollar/Franc duplicationCommon equalsCommon timesCompare Francs with Dollars

The thought struck us at the end of Chapter 6: what happens when we compare Francs with Dollars? We dutifully turned our dreadful thought into an item on our to-do list. But we just can't get it out of our heads. What does happen?

public void testEquality() {
					assertTrue(new Dollar(5).equals(new Dollar(5)));
					assertFalse(new Dollar(5).equals(new Dollar(6)));
					assertTrue(new Franc(5).equals(new Franc(5)));
					assertFalse(new Franc(5).equals(new Franc(6)));
					assertFalse(new Franc(5).equals( ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required