public void validate_static_method_updatedirectionafterrotatingbygivenanglepair()
        {
            var dir = _direction.Clone();

            SourceToolbox.UpdateDirectionAfterRotatingByGivenAnglePair(_angPair, dir);

            Assert.Less(Math.Abs(dir.Ux - _tp[97]), ACCEPTABLE_PRECISION);
            Assert.Less(Math.Abs(dir.Uy - _tp[98]), ACCEPTABLE_PRECISION);
            Assert.Less(Math.Abs(dir.Uz - _tp[99]), ACCEPTABLE_PRECISION);
        }