在這個case我們得到四個可能的錯誤：
load method's return value
getData method's return value
number structure member's value
string structure member's value
第二個用例也是相似的。但是困難點，我們需要使用已知的數據來填充fixture，把它存在磁盤臨時文件里，然后打開兩個文件（新的和輔助文件），讀并比較內容，兩者如一致正確
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");
}
調用用戶接口
后，我們看看用一個mfc 對話框（TestRunner.dll）用來說明。
我們需要在我們的初始化函數中做如下初始化
#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;
}
只要定義一個test的實例，然后注冊所有用例，再執行case
