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complex Different test scenarios may make the tested code return results that differ only in speci c attributes, so comparing the entire result each time is misleading and introduces an implicit dependency on the behavior of the whole tested object There are a couple of ways in which a result can be more complex First, it can be de ned as a structured value type This is straightforward since we can just reference directly any attributes we want to assert For example, if we take the nancial instrument from Use Structure to Explain (page 253), we might need to assert only its strike price:
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assertEquals("strike price", 92, instrumentgetStrikePrice());
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without comparing the whole instrument We can use Hamcrest matchers to make the assertions more expressive and more nely tuned For example, if we want to assert that a transaction identi er is larger than its predecessor, we can write:
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assertThat(instrumentgetTransactionId(), largerThan(PREVIOUS_TRANSACTION_ID));
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This tells the programmer that the only thing we really care about is that the new identi er is larger than the previous one its actual value is not important in this test The assertion also generates a helpful message when it fails The second source of complexity is implicit, but very common We often have to make assertions about a text string Sometimes we know exactly what the text should be, for example when we have the FakeAuctionServer look for speci c messages in Extending the Fake Auction (page 107) Sometimes, however, all we need to check is that certain values are included in the text A frequent example is when generating a failure message We don t want all our unit tests to be locked to its current formatting, so that they fail when we add whitespace, and we don t want to have to do anything clever to cope with timestamps We just want to know that the critical information is included, so we write:
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assertThat(failureMessage, allOf(containsString("strikePrice=92"), containsString("id=FGD430"), containsString("is expired")));
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which asserts that all these strings occur somewhere in failureMessage That s enough reassurance for us, and we can write other tests to check that a message is formatted correctly if we think it s signi cant One interesting effect of trying to write precise assertions against text strings is that the effort often suggests that we re missing an intermediate structure object in this case perhaps an InstrumentFailure Most of the code would be written in terms of an InstrumentFailure, a structured value that carries all the relevant elds The failure would be converted to a string only at the last possible moment, and that string conversion can be tested in isolation
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We can extend the concept of being precise about assertions to being precise about expectations Each mock object test should specify just the relevant details of the interactions between the object under test and its neighbors The combined unit tests for an object describe its protocol for communicating with the rest of the system We ve built a lot of support into jMock for specifying this communication between objects as precisely as it should be The API is designed to produce tests that clearly express how objects relate to each other and that are exible because they re not too restrictive This may require a little more test code than some of the alternatives, but we nd that the extra rigor keeps the tests clear
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We want to be as precise about the values passed in to a method as we are about the value it returns For example, in Assertions and Expectations (page 254) we showed an expectation where one of the accepted arguments was any type of RuntimeException; the speci c class doesn t matter Similarly, in Extracting the SnipersTableModel (page 197), we have this expectation:
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oneOf(auction)addAuctionEventListener(with(sniperForItem(itemId)));
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The method sniperForItem() returns a Matcher that checks only the item identi er when given an AuctionSniper This test doesn t care about anything else in the sniper s state, such as its current bid or last price, so we don t make it more brittle by checking those values The same precision can be applied to expecting input strings If, for example, we have an auditTrail object to accept the failure message we described above, we can write a precise expectation for that auditing:
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oneOf(auditTrail)recordFailure(with(allOf(containsString("strikePrice=92"), containsString("id=FGD430"), containsString("is expired"))));
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