public void WriteXmlSchema_ConstraintNameWithSpaces()
{
DataSet ds = new DataSet();
DataTable table1 = ds.Tables.Add("table1");
DataTable table2 = ds.Tables.Add("table2");
table1.Columns.Add("col1", typeof(int));
table2.Columns.Add("col1", typeof(int));
table1.Constraints.Add("uc 1", table1.Columns[0], false);
table2.Constraints.Add("fc 1", table1.Columns[0], table2.Columns[0]);
StringWriter sw = new StringWriter();
//should not throw an exception
ds.WriteXmlSchema(sw);
}