QTestLib - Testing Exceptions

[Dashboard]

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.

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);

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);

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Is there a suitable equivalent in QTestLib?

Thanks for any help.

[ChrisW67]

Could you do something like:

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

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

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or

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

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

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[Dashboard]

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:

#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);

#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);

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