When using googletest:

consider 

TEST(Test1, T)
{
 std::string s(100000, '.');
 FAIL() << s;
}

Let this test run in the IDE.
Then you have right to 'FAIL() << s;' next to line number a marking which would show the fail message as a fly over hint. But the IDE just crashs - obviously because of the long message..

And if you fix this - please show somewhere the full output of the test, in the test execution view it is already limited, Or set limits behind just some kB - maybe 1 MB?