Header-only with multiple translation units

It is possible to use the header-only variant of the Unit Test Framework even if the test module has multiple translation units:

one translation unit should define BOOST_TEST_MODULE and include <boost/test/included/unit_test.hpp>
all the other translation units should include <boost/test/unit_test.hpp>

An example might be the following:

Translation unit 1, defines BOOST_TEST_MODULE

#define BOOST_TEST_MODULE header-only multiunit test
#include <boost/test/included/unit_test.hpp>

BOOST_AUTO_TEST_CASE( test1 )
{
    int i = 1;
    BOOST_CHECK( i*i == 1 );
}

Translation unit 2, includes <boost/test/unit_test.hpp> instead of <boost/test/included/unit_test.hpp>:

#include <boost/test/unit_test.hpp>

BOOST_AUTO_TEST_CASE( test2 )
{
    int i = 1;
    BOOST_CHECK( i*i == 1 );
}