November 2002
Intermediate to advanced
240 pages
5h 9m
English
Content preview from Test Driven Development: By Example
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Chapter 13
Make It
We can’t mark our test for $5 + $5 done until we’ve removed all of the duplication. We don’t have code duplication, but we do have data duplication—the $10 in the fake implementation:
Bank
Money reduce(Expression source, String to) {
return Money.dollar(10);
}
is really the same as the $5 + $5 in the test:
public void testSimpleAddition() { Money five= Money.dollar(5); Expression sum= five.plus(five); Bank bank= new Bank(); Money reduced= bank.reduce(sum, "USD"); assertEquals(Money.dollar(10), reduced); }
Before when we’ve had a fake implementation, it has been obvious how to work backward to the real implementation. ...
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