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


    double v1 = 1.23456e28;
    double v2 = 1.23457e28;

    BOOST_REQUIRE_CLOSE( v1, v2, 0.001 );
    // Absolute value of difference between these two values is 1e+23.
    // But we are interested only that it does not exeed 0.001% of a values compared
    // And this test will pass.