Re: [Boost-users] Boost.Test - how to print the value of a variable in case of error?

Subject: Re: [Boost-users] Boost.Test - how to print the value of a variable in case of error?
From: Richard (legalize+jeeves_at_[hidden])
Date: 2010-06-24 11:34:28

[Please do not mail me a copy of your followup]

boost-users_at_[hidden] spake the secret code
<BD63511532FE974CBFF3543FD105DDC4437AAE6CDB_at_[hidden]> thusly:

>Imagine this:
>
>BOOST_CHECK_EQUAL(cont.erase(key),1u);

First, I recommend use of BOOST_REQUIRES_xxx instead of BOOST_CHECK_xxx.

>If it fails, it tells me this:
>
>basics.cpp(61): error in "test_case": check cont.erase(key) == 1u failed
>[0 != 1]

If you use BOOST_CHECK_MESSAGE(predicate, message), you can create a
custom failure message that contains additional context:

#define BOOST_TEST_MODULE example
#include <boost/test/included/unit_test.hpp>

#include <cmath>

BOOST_AUTO_TEST_CASE( test )
{
    double res = std::sin( 45. );

    BOOST_WARN_MESSAGE( res > 1,
                "sin(45){" << res << "} is <= 1.  Hmm.. Strange. " );
}

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