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Private methods and members are the bane of a unit tester s life, as the test doesn t have access to them. This isn t as bad of a problem with DDT as it is with TDD, as DDT takes a more gray box approach, and doesn t assume a need to know the internals of every line and field within the class under test. However, it still can be an issue: public class Hotel { private boolean hotelDetailsFound; . . .
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Just stuff everything into the MXML seems to be a pretty typical Flex design pattern, unfortunately.
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CHAPTER 9 UNIT TESTING ANTIPATTERNS (THE DON TS )
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} Let s say you ve written a hotel search test, and you want to assert that the object under test correctly flags that the hotel search was successful: @Test public void hotelFoundFlagIsSet() throws Exception { Hotel hotel = new Hotel(); hotel.search("New York", "541 Madison Avenue"); assertTrue("Hotel was found", hotel.hotelDetailsFound); } The code in bold text won t compile, because hotelDetailsFound is private, so the test can t gain access to it. There s more than one possible solution to this issue, with varying degrees of attractiveness. Like a page from www.AmIHotOrNot.com, vote on your favorite solution in 10, in the section Use Black Box Testing So You Don t Have to Break Encapsulation.
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2. Service Objects That Are Declared Final
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With Java, fields that are declared final are immutable (note this doesn t mean that values inside the referenced object are immutable; just the reference to the object). Because they re final, it makes sense that they will be initialized as part of the declaration: final String url = "http://articles.softwarereality.com"; final PriceStreamer priceStreamer = new PriceStreamer(); The first line is an example of a simple value that you want to remain constant, whereas the second line is an example of a complex object, or service object, that performs some task or other for the class under test. Simple value fields that are declared final can generally be considered a good thing for the purposes of software quality. You know exactly what you re getting; you don t have to worry about multi-threading issues (e.g., one thread reading the field while another thread is modifying its value; or the race condition where two threads are updating a field, hence one value is lost). However, in the case of service objects, there are occasions when a final member can really put a dampener on a unit test s day.
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1. Half-Baked Features from the Good Deed Coder
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The just-in-case malady is the bane of developers everywhere, not just those wielding a JUnit test class. It s an insidious antipattern because it s born entirely of good intentions. I ll make this class reusable (read: I ll make this class more complex than it needs to be ) just in case someone will need to use it later. The result, especially when this good deed happens at the coding stage and not at the design or analysis stage, is that the code can t be traced back to a particular business requirement. So when you re maintaining some mystery code whether to apply unit tests to it, or extend it with new functionality, or refactor a crusty design it can be difficult to determine whether the code even needs to be there. If the code is simply deleted, will something else in the system mysteriously stop working It s impossible to say, as it isn t covered by a test or linked back to a requirement.
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CHAPTER 9 UNIT TESTING ANTIPATTERNS (THE DON TS )
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Summary
In this chapter we looked at a number of common suicidally bad antipatterns in software design, which make your code much harder to unit-test, and which, in some cases (e.g., static initializers and complex constructors), also happen to generally make software less stable and less maintainable. As we mentioned at the start, testability isn t the be-all and end-all of software design, and is just one (admittedly important) consideration to be weighed up among many. But from the point of view of a developer trying to write unit tests, the problems described in this chapter will make that developer s life really difficult. In the next chapter, we ll transform the top ten antipatterns into a list of design guidelines, the top ten to-do items.
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