public void CanSetPrecision()
{
var hbm = new HbmColumn();
var mapper = new ColumnMapper(hbm, "aColumn");
mapper.Precision(12);
hbm.precision.Should().Be("12");
mapper.Executing(m => m.Precision(0)).Throws <ArgumentOutOfRangeException>();
mapper.Executing(m => m.Precision(-1)).Throws <ArgumentOutOfRangeException>();
}