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CHAPTER 11 AUTOMATED INTEGRATION TESTING
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This version loads up the simulated XML response from a file, and then inserts the mock HttpClient into the code being tested. We ve fenced the code in so that it thinks it s making an external call, but is really being fed a simulated response. It really is that simple to pass in a mock object a minute s work and it makes life much easier in terms of testing.3 However and that should really be a big however in a 50-point bold+italic font hiding the live interface loses a major benefit of integration testing: the whole point of integration testing is that we are testing the live interface. The number of hotels may change, but what if the format of the XML was randomly changed by the service vendor Our system would break, and we might not find out until endusers report that they re seeing errors. A controller-level integration test like the one we just showed would catch this change straightaway. You could, of course, reduce the integration test s dependence on specific data by changing the nature of the assertion; e.g., instead of checking for a range of hotels returned, check that one particular expected hotel is in the result-set, and that its fields are in the right place (the hotel name is in the Name field, city is in the City field, etc.). There ll still be cases where the test has to check data that s likely to change; in this case, you ll just have to grit your teeth and update the test each time.
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Note Both of the tests we just showed are valid: they re achieving different things. The integration test is checking that the live interface hasn t inexplicably changed; the isolated test is focused on the XML parsing and HotelCollection construction. While there appears to be an overlap between them, they both need to exist in separate test suites (one run during the build, the other on a regular basis but independently of the build).
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So the pain of integration testing is worth enduring, as it s quite minor compared with the pain of producing a system without integration tests.
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6. Drive Scenario Tests from Use Case Scenarios
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Scenario-level integration tests are end-to-end tests. By this, we mean that the test verifies the complete scenario, from the initial screen being displayed, through each user step and system response, to the conclusion of the scenario. If you re thinking that scenario-level tests sound just like automated versions of the use case thread expansion scenario test scripts from 7, you d be right: that s exactly what they are. So, however you go about automating them, the first stage in automating scenario-level tests is to follow the steps described in 7, to identify the individual use case threads and define test cases and test scenarios for each one.
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One side-effect that we should point out is that we ve just transformed the test from a black box test to a white box (or clear box ) test because the test code now knows that HotelSearchClient uses an HttpClient instance internally. As we discussed in s 5 and 6, this is sometimes a necessary trade-off in order to isolate the code under test, but it does mean that your code is that bit less maintainable because a change inside the code, e.g., replacing HttpClient with some other toolkit, or even just an upgraded version of HttpClient with its own API change, means that the test must also be updated.
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CHAPTER 11 AUTOMATED INTEGRATION TESTING
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Tip There s a lot to be said for being able to run a full suite of end-to-end integration tests through a repeatable suite of user scenarios, just by clicking Run . And there s even more to be said for making these end-to-end tests run automatically, either once per hour or once per night, so you don t have to worry about people forgetting to run them.
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There are many, many options regarding how to write scenario-level tests. In the next section we ll suggest a few, and give some pointers for further reading, though none of these is really DDT-specific or counts as the DDT way. The main thing to keep in mind is that an automated scenario-level test needs to follow a specific use case scenario as closely as possible, and should have the same pass/fail conditions as the acceptance criteria you identified for your manual scenario tests (again, see 7). Another thing to keep in mind is that scenario-level integration tests are simply unit tests with a much broader scope: so they can be written just like JUnit tests, with setUp(), tearDown(), and test methods, and with an assert statement at the end to confirm that the test passed. The language or the test framework might differ, but the principle is essentially the same.
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