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using a mock object framework
Mock objects are working object stand-ins
Let’s look at a mock object framework in action. Below is a test that uses the EasyMock
framework, a mock object framework for Java. A good mock object framework allows you to
simulate an object’s behavior, without writing code for that object.
This is
all “normal”
test code...
no mock
objects
involved yet.
import org.easymock.*;
// This test will test placing an order with a valid gift card
// with exactly the right amount of money on it.
@Test
public void testSimpleOrder() {
// Set everything up and get ready
OrderInformation orderInfo = new OrderInformation();
orderInfo.setCustomerName(“Dan”);
orderInfo.setDrinkDescription(“Bold with room”);
orderInfo.setGiftCardNumber(12345);
orderInfo.setPreferredStoreNumber(123);
Date activationDate = new Date(); // Valid starting today
Date exiprationDate = new Date(activationDate.getTime() + 3600);
BigDecimal gcValue = new BigDecimal(“2.75”); // Exactly enough
GiftCard startGC =
new GiftCard(activationDate, expirationDate, gcValue);
BigDecimal gcEndValue = new BigDecimal(“0”); // Nothing left
GiftCard endGC =
new GiftCard(activationDate, expirationDate, gcEndValue);
// Here’s where the mock object creation happens
DBAccessor mockAccessor = EasyMock.createMock(DBAccessor.class);
306 Chapter 8
Whatever framework
you use, you’ll need to
import the right classes.
We want an object that
implements this interface......so we tell our framework to create a mock
object that implements the right interface.
At this point, the mock object framework doesn’t know much—just that
it has to create a stand-in for the DBAccessor class. So it knows the
methods it “mocks”, but nothing more than that—no behavior yet at all.
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This is all part of the
test orderInfo object
we want to use.
This sets up test values
that we’ll use in the
GiftCard we’re testing.
We need a gift card representing the
starting values we’re testing...
...and then an
“ending” gift
card. This has
what should be
returned from
testing order
processing.