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A mock object stands in for real objects
There’s really no need for three different accessors, all of which create a new GiftCard
object and populate it with different data. That’s a lot of extra code to instantiate a
GiftCard and call some setter methods.
Since we have an interface that describes what each of these implementations should look
like, we can take advantage of a mock object framework to do the heavy lifting. Instead
of implementing all of the classes ourselves, we can give the framework the interface we
want implemented and then tell it what we expect to happen.
Here’s a strategy
that will make good
gift cards...
TestGoodDBAccessor
+ getGC(gcId : int) :GiftCard
+ saveGC(card : GiftCard) :void
DBAccessor
+ getGC(gcId : int) :GiftCard
+ saveGC(card : GiftCard) :void
TestInsufficientDBAccessor
+ getGC(gcId : int) :GiftCard
+ saveGC(card : GiftCard) :void
Here’s one that will
make a gift card with
TestInvalidDBAccessor
+ getGC(gcId : int) :GiftCard
+ saveGC(card : GiftCard) :void
test-driven development
This is really what our Order Processor
depends on—the DBAccessor interface.
That’s what we’re going to “mock up”
rather than write real classes...
And our real,
MySQL one.
MySQLDBAccessor
+ getGC(gcId : int) :GiftCard
+ saveGC(card : GiftCard) :void
insufficient funds on it...Here’s one that will throw
We really don’t want to have to write
and maintain these. Instead we’ll
replace all of them with mock objects.
The mock framework will handle creating implementations of the interface and keeping track
of what methods we say should be called, what they should return when they are called, what
shouldn’t be called, etc. The mock framework’s implementation of our interface will track all of
this and throw an error if something doesn’t go according to the plan we gave it.
* We’re going to use the EasyMock framework here but a mock object framework exists
for most languages and they all work similarly.
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an error regardless of
what ID you give it.
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