1.2问题2
　　然后GetPaperPart()方法中加入如下代码，测试边界情况：
            p = part.GetPaperPart(1000);//边界情况
            Assert.AreEqual(p, null);
　　用以上代码测试边界条件时，状态条为红色。
　　经检查，发现代码如下
public WYEng.Model.TQL_Part GetPaperPart(int taskId)
        ...{
            SqlParameter[] parm = new SqlParameter[1];
            parm[0] = new SqlParameter(PARM_TASKID, SqlDbType.Int);
            parm[0].Value = taskId;
            WYEng.Model.TQL_Part part = new WYEng.Model.TQL_Part();
 
            using (SqlDataReader rdr = XPWY.DBUtility.DBHelperSQL.ExecuteReader(SQL_SELECT_PART, parm))
            ...{
                    while (rdr.Read())
                    ...{
                        part.PartCode = rdr.GetString(0);
                        part.SetCode = rdr.GetString(1);
                        part.SubjectId = rdr.GetInt32(2);
                        part.DisplayOrder = rdr.GetInt32(3);
                        part.Description = rdr.GetString(4);
                    }
            }
            return part;
        }

 用YEng.Model.TQL_Part part = new WYEng.Model.TQL_Part();实例化一个对象以后，如果rdr里面没有任何行，part的值也不为null，所以修改代码如下：
 public WYEng.Model.TQL_Part GetPaperPart(int taskId)
        ...{
            SqlParameter[] parm = new SqlParameter[1];
            parm[0] = new SqlParameter(PARM_TASKID, SqlDbType.Int);
            parm[0].Value = taskId;
            WYEng.Model.TQL_Part part = new WYEng.Model.TQL_Part();
 
            using (SqlDataReader rdr = XPWY.DBUtility.DBHelperSQL.ExecuteReader(SQL_SELECT_PART, parm))
            ...{
                if (!rdr.HasRows)
                ...{
                    part = null;
                }
                else
                ...{
                    while (rdr.Read())
                    ...{
                        part.PartCode = rdr.GetString(0);
                        part.SetCode = rdr.GetString(1);
                        part.SubjectId = rdr.GetInt32(2);
                        part.DisplayOrder = rdr.GetInt32(3);
                        part.Description = rdr.GetString(4);
                    }
                }
            }
            return part;
        }

　　运行Nunit后，状态为绿色，其他的类似问题也进行了相应的修正。
　　我正在研究Nunit单元测试，有不当的地方希望大家能指正，谢谢。