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In this section, we will discuss how test units can be developed in F# using the NUnit tool from http://wwwnunitorg, a freely available tool supporting this testing strategy The tool was inspired from JUnit, a unit testing suite for the Java programming language, but the interface has been redesigned to take advantage of the extensible metadata provided by the CLR by means of custom attributes To make the experience more concrete, we ll start with an example and develop a very simple test suite for the isPalindrome function The first choice you have to face is whether tests should be embedded into the application.

Question 6. (advanced) MySQL does not currently support the intersect operation (as defined by Date). Change the MySQL parser to recognize the new keyword and process queries like SELECT * FROM A INTERSECT B. Are there any limitations of this operation and are they reflected in the optimizer

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This section starts with a simple example of a DLL developed using C++, to which you add code during your experiments using PInvoke The CInteropDLLh header file declares a macro defining the decorations associated with each exported function: #define CINTEROPDLL_API __declspec(dllexport) extern "C" { void CINTEROPDLL_API HelloWorld(); } The __declspec directive is specific to the Microsoft Visual C++ compiler Other compilers may provide different ways to indicate the functions that must be exported when compiling a DLL The first function is HelloWorld; its definition is as expected: void CINTEROPDLL_API HelloWorld() { printf("Hello C world invoked by F#!\n"); } Say you now want to invoke the HelloWorld function from an F# program You have to define the prototype of the function and inform the runtime how to access the DLL and the other information needed to perform the invocation The program performing the invocation is the following: open SystemRuntime.

If tests are created as a separated application, you can invoke only the public interface of your software, and features internal to the software cannot be tested directly; on the other hand, if you embed unit tests within the program, you introduce a dependency from the nunitframeworkdll assembly, and unit tests are available at runtime even where unneeded Because the NUnit approach is based on custom attributes, performance is not affected in both cases If tests are used during program development, it is more convenient to define them inside the program; in this case, conditional compilation may help to include them only in checked builds Listing 18-1 shows a test fixture for the isPalindrome function, which is a set of unit tests.

InteropServices module CInterop = [<DllImport("CInteropDLL", CallingConvention=CallingConventionCdecl)>] extern void HelloWorld() CInteropHelloWorld() The extern keyword informs the compiler that the function definition is external to the program and must be accessed through the PInvoke interface A C-style prototype definition follows the keyword, and the whole declaration is annotated with a custom attribute defined in the SystemRuntimeInteropServices namespace The F# compiler adopts C-style syntax for extern prototypes, including argument types (as you see later), because C headers and prototypes are widely used; this choice helps in the PInvoke definition The DllImport custom attribute provides the information needed to perform the invocation The first argument is the name of the DLL containing the function; the remaining option specifies the calling convention chosen to make the call.

What sounds like a very difficult problem has a very straightforward solution. Consider adding a new node type named intersect that has two children. The operation merely returns those rows that are in both tables. Hint: Use one of the many merge sort variants to accomplish this.

Test fixtures are represented by a class annotated with the TestFixture custom attribute, and tests are instance methods with the signature unit -> unit and annotated with the Test custom attribute Inside a test case, methods of the Assert class are used for testing conditions that have to be satisfied during the test If one of these fails, the test is considered failed, and it is reported to the user by the tool that coordinates test execution..

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