[Boost-users] unit test BOOST_CHECK_CLOSE absolute

I am doing unit tests using boost utf but I have sometimes problems with BOOST_CHECK_SMALL because it checks relative value. For example, I am comparing coordinates in 2d spaces and the relative value is not important, the meaningfull value is the absolute difference between coordinates. I have seen that I can do a BOOST_CHECK_SMALL(fabs(x - expected_x), 1e-3); but in this can I don't have a good message when the test fails (it does not show the value of x and the expected_x). In fact I would like to have something like BOOST_CHECK_CLOSE_ABSOLUTE ? Is there something equivalent or how can I do something like this ?