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In this example we are testing the return value of the extraction with an assertion because we know that it must succeed The overloaded >>= operator succeeds only if the Any contains an unbounded string The main question for string extraction is this: who owns the memory for the string after the extraction The answer is that the Any retains ownership of the string, so the returned pointer points at memory internal to the Any This means that you must not deallocate the extracted string, and you must treat the extracted string as read-only The following code contains two mistakes:

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CORBA::Any a; a <<= "Hello"; char * msg; a >>= msg; msg[0] = 'h'; CORBA::string_free(msg); // OK, extract string // Bad news, string is read-only // Looming disaster!

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This code modifies the string via the returned pointer, and that is not portable[3] In addition, the call to string_free is certain to cause problems because the Any still

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Sometimes we nd it dif cult to write a test for some functionality we want to add to our code In our experience, this usually means that our design can be improved perhaps the class is too tightly coupled to its environment or does not have clear responsibilities When this happens, we rst check whether it s an opportunity to improve our code, before working around the design by making the test more complicated or using more sophisticated tools We ve found that the qualities that make an object easy to test also make our code responsive to change The trick is to let our tests drive our design (that s why it s called test-driven development) TDD is about testing code, verifying its externally visible qualities such as functionality and performance TDD is also about feedback on the code s internal qualities: the coupling and cohesion of its classes, dependencies that are explicit or hidden, and effective information hiding the qualities that keep the code maintainable With practice, we ve become more sensitive to the rough edges in our tests, so we can use them for rapid feedback about the design Now when we nd a feature that s dif cult to test, we don t just ask ourselves how to test it, but also why is it dif cult to test In this chapter, we look at some common test smells that we ve encountered and discuss what they might imply about the design of the code There are two categories of test smell to consider One is where the test itself is not well written it may be unclear or brittle Meszaros [Meszaros07] covers several such patterns in his Test Smells chapter This chapter is concerned with the other category, where a test is highlighting that the target code is the problem Meszaros has one pattern for this, called Hard-to-Test Code We ve picked out some common cases that we ve seen that are relevant to our approach to TDD.

owns the string and will deallocate it a second time when it goes out of scope, possibly causing a core dump

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[3] The C++ mapping requires you to treat the returned string as read-only to avoid restricting ORB implementations unnecessarily

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If you want to modify an extracted string, you must make a copy and modify the copy Fortunately, a String_var will automatically make a deep copy for you:

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CORBA::Any a; a <<= "Hello"; const char * msg; a >>= msg; msg[0] = 'h'; CORBA::String_var copy(msg); copy[0] = 'h'; // // // // // Note const char *, not char * OK, extract string Error, msg is const Make deep copy Fine, modify copy

(never)

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