public void AsDataTable()
{
var result = _testHelper.PeopleAsDataTable();
Assert.Equal(_people.Select(p => p.Id).ToArray(), result.Rows.OfType <DataRow>().Select(dr => (int)dr["Id"]).ToArray());
var columnName = _testHelper.GetColumnName(nameof(Person.OptionalNumber));
Assert.Equal(_people.Select(p => p.OptionalNumber).ToArray(), result.Rows.OfType <DataRow>().Select(dr => dr.Field <int?>(columnName)).ToArray());
}
