QTestLib - Testing Exceptions

Hi,

I'm in the process of migrating a bunch of tests from UnitTest++ to QTestLib. I've gotten almost everything working aside from one thing - testing exceptions.

For example, using UnitTest++, I can verify the following function throws an exception using the CHECK_THROW macro.

Code:

---

int foo(int i)
{
    if (i < 0)
        throw std::invalid_argument("Invalid value for i");
 
    // Do something
    return i * 2;
}
 
...
 
// Ensure exception is thrown when negative value of i is passed
CHECK_THROW(foo(-1), std::invalid_argument);
 
// Ensure valid data works
CHECK(foo(0) == 0);
CHECK(foo(1) == 2);

---

Is there a suitable equivalent in QTestLib?

Thanks for any help.

Could you do something like:

Code:

---

try {
  foo(-1);
  QFAIL("Exception not thrown");
}
catch (...) {
}

---

or

Code:

---

bool exceptionSeen = false;
try {
  foo(-1);
}
catch (std::invalid_argument&) {
  exceptionSeen = true;
}
QCOMPARE(exceptionSeen, true);

---

Thanks for the reply. I was hoping there might be an existing macro/feature I had overlooked, but I guess not.

I ended up creating a macro using a hybrid of the CHECK_THROW and QVERIFY macros:

Code:

---

#define QVERIFY_THROW(expression, ExpectedExceptionType) \
do \
{ \
    bool caught_ = false; \
    try { expression; } \
    catch (ExpectedExceptionType const&) { caught_ = true; } \
    catch (...) {} \
    if (!QTest::qVerify(caught_, #expression ", " #ExpectedExceptionType, "", __FILE__, __LINE__))\
        return; \
} while(0)
 
...
 
QVERIFY_THROW(foo(-1), std::invalid_argument);

---

Pretty much the same as your 2nd suggestion. Seems to work fine.