FAQ-0815 How can my test script efficiently test code that panics?


FAQ-0815 How can my test script efficiently test code that panics?

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Classification:	C++	Category:	Errors & Error Handling
Created:	09/03/2002	Modified:	09/10/2002
Number:	FAQ-0815
Platform:	Not Applicable

Question:
If I have a class that is documented as panicking on bad input, 'good' unit test code would check that it panics with the documented panic code. How can I write an automated test script which checks this then continues with other tests?

Answer:
The answer is to run the test on a separate thread and use User::SetJustIntime(EFalse) so that the thread only, not the whole emulator, is panicked. Here's a chunk of test code to demonstrate this.

LOCAL_C TInt IllegalPanicThing(TAny* aData)
{
// call the code which PANICS here

return 0;
}

LOCAL_C void TestIllegal()
{
RThread thread;
TRequestStatus threadstat;
TBool jit = User::JustInTime();
User::SetJustInTime(EFalse);
TInt ret = thread.Create(KThread2Name, IllegalPanicThing, KDefaultStackSize, KHeapSize, KHeapSize, &data);
test(KErrNone == ret);
thread.Logon(threadstat);
thread.Resume();
User::WaitForRequest(threadstat);
test (thread.ExitType() == EExitPanic);
test (thread.ExitReason() == EXPECTEDPANIC);
thread.Close();
User::SetJustInTime(jit);
}