public void GetColumnType_StringType_ExcpectSuccess(string typeString)
        {
            IColumnType testObj = ColumnTypeFactory.GetColumnType(typeString);

            Assert.IsInstanceOf <ColumnTypeString>(testObj);
        }
 [TestCase("datetime")] // потому что есть "Date"
 public void GetColumnType_UpsupportedType_ExpectUnsupportedColumnTypeException(string typeString)
 {
     Assert.Catch <UnsupportedColumnTypeException>(() => ColumnTypeFactory.GetColumnType(typeString));
 }