下面是测试loadTest的例子，
//
// These are correct values stored in auxiliar file
//
#define AUX_FILENAME    "ok_data.dat"
#define FILE_NUMBER    19
#define FILE_STRING    "this is correct text stored in auxiliar file"

void DiskDataTestCase::loadTest()
{
    // convert from relative to absolute path
    TCHAR    absoluteFilename[MAX_PATH];
    DWORD    size = MAX_PATH;

    strcpy(absoluteFilename， AUX_FILENAME);
    CPPUNIT_ASSERT( RelativeToAbsolutePath(absoluteFilename， &size) );

    // executes action
    CPPUNIT_ASSERT( fixture->load(absoluteFilename) );

    // ...and check results with assertions
    LPDATA    loadedData = fixture->getData();

    CPPUNIT_ASSERT(loadedData != NULL);
    CPPUNIT_ASSERT_EQUAL(FILE_NUMBER， loadedData->number);
    CPPUNIT_ASSERT( 0 == strcmp(FILE_STRING，
            fixture->getData()->string) );
}
在这个case我们得到四个可能的错误：
load method's return value
getData method's return value
number structure member's value
string structure member's value

第二个用例也是相似的。但是困难点，我们需要使用已知的数据来填充fixture，把它存在磁盘临时文件里，然后打开两个文件（新的和辅助文件），读并比较内容，两者如一致正确

void DiskDataTestCase::storeTest()
{
    DATA    d;
    DWORD      tmpSize， auxSize;
    BYTE     *tmpBuff， *auxBuff;
    TCHAR    absoluteFilename[MAX_PATH];
    DWORD    size = MAX_PATH;

    // configures structure with known data
    d.number = FILE_NUMBER;
    strcpy(d.string， FILE_STRING);

    // convert from relative to absolute path

    strcpy(absoluteFilename， AUX_FILENAME);
    CPPUNIT_ASSERT( RelativeToAbsolutePath(absoluteFilename， &size) );

    // executes action
    fixture->setData(&d);
    CPPUNIT_ASSERT( fixture->store("data.tmp") );

    // Read both files contents and check results
    // ReadAllFileInMemory is an auxiliar function which allocates a buffer
    // and save all file content inside it. Caller should release the buffer.
    tmpSize = ReadAllFileInMemory("data.tmp"， tmpBuff);
    auxSize = ReadAllFileInMemory(absoluteFilename， auxBuff);

    // files must exist
    CPPUNIT_ASSERT_MESSAGE("New file doesn't exists?"， tmpSize > 0);
    CPPUNIT_ASSERT_MESSAGE("Aux file doesn't exists?"， auxSize > 0);

    // sizes must be valid
    CPPUNIT_ASSERT(tmpSize != 0xFFFFFFFF);
    CPPUNIT_ASSERT(auxSize != 0xFFFFFFFF);

    // buffers must be valid
    CPPUNIT_ASSERT(tmpBuff != NULL);
    CPPUNIT_ASSERT(auxBuff != NULL);

    // both file's sizes must be the same as DATA's size
    CPPUNIT_ASSERT_EQUAL((DWORD) sizeof(DATA)， tmpSize);
    CPPUNIT_ASSERT_EQUAL(auxSize， tmpSize);

    // both files content must be the same
    CPPUNIT_ASSERT( 0 == memcmp(tmpBuff， auxBuff， sizeof(DATA)) );

    delete [] tmpBuff;
    delete [] auxBuff;

    ::DeleteFile("data.tmp");
}

调用用户接口
后，我们看看用一个mfc 对话框（TestRunner.dll）用来说明。

我们需要在我们的初始化函数中做如下初始化

#include <cppunit/ui/mfc/TestRunner.h>
#include <cppunit/extensions/TestFactoryRegistry.h>

BOOL CMy_TestsApp::InitInstance()
{
    ....

    // declare a test runner， fill it with our registered tests and run them
    CppUnit::MfcUi::TestRunner runner;

    runner.addTest( CppUnit::TestFactoryRegistry::getRegistry().makeTest() );

    runner.run();  

    return TRUE;
}

只要定义一个test的实例，然后注册所有用例，在跑case。