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: Attila Feher F (attila.f.feher_at_[hidden])
Date: 2010-06-28 01:08:56

Richard wrote:
[SNIP]
>> 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. " ); }

Thanks!  I was doing that earlier, but I was hoping there is a "better" solution.  With this, I have to do all the things "by hand", so for example the spelling out of the two sides of an EQUAL check. :(  It seems that I have to "duplicate" all existing macros and create something like a BOOST_CHECK_..._WITH(...) series.  

Eg.:

BOOST_CHECK_EQUAL_WITH(lhs,rhs,v1,v2)

used as:

BOOST_CHECK_EQUAL_WITH(a[i],b[j],i,j)

output:

tests.cpp(99): error in "test_case": check a[i] == b[j] [with i==1, j==42] failed [0 != 1]

BR,
Attila aka WW