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，再执行case