My preference in tests is a little different than just using IEEE 754 ==,

    _Bool equiv(float x, float y) {
        return (x <= y && y <= x)
            || (x != x && y != y);
    }

which both handles NaNs sensibly (all NaNs are equivalent) and won't warn about using == on floats. I find it also easy to remember how to write when starting a new project.