5

在我的 C# 单元测试中，我经常根据 ID 列表查询行列表。然后我想确保 1) 对于所有 ID，至少找到一个具有该 ID 的行，并且 2) 对于所有返回的行，每一行都有一个 ID，该 ID 在要查找的 ID 列表中。以下是我通常如何确保：

Assert.IsTrue(ids.All(
    id => results.Any(result => result[primaryKey].Equals(id))
), "Not all IDs were found in returned results");

Assert.IsTrue(results.All(
    result => ids.Any(id => result[primaryKey].Equals(id))
), "Returned results had unexpected IDs");

我认为使用AnyandAll对此类检查很方便，但我想看看是否有人认为这比它可能的可读性差，或者是否有更好的方法来进行这样的双向检查。我在 Visual Studio 2008 Team System 中使用 MSTest 进行单元测试。如果过于主观，这也许应该是社区 wiki。

编辑：我现在正在使用基于 Aviad P. 建议的解决方案，以及以下测试通过的事实：

string[] ids1 = { "a", "b", "c" };
string[] ids2 = { "b", "c", "d", "e" };
string[] ids3 = { "c", "a", "b" };
Assert.AreEqual(
    1,
    ids1.Except(ids2).Count()
);
Assert.AreEqual(
    2,
    ids2.Except(ids1).Count()
);
Assert.AreEqual(
    0,
    ids1.Except(ids3).Count()
);
4

4 回答 4

4

您可以选择使用Except运算符：

var resultIds = results.Select(x => x[primaryKey]);

Assert.IsTrue(resultIds.Except(ids).Count() == 0,
 "Returned results had unexpected IDs");

Assert.IsTrue(ids.Except(resultIds).Count() == 0,
 "Not all IDs were found in returned results");
于 2010-01-04T20:03:21.000 回答
3

IMO，不像它应该的那样可读。创建并记录一个返回真/假的方法。然后调用 Assert.IsTrue(methodWithDescriptiveNameWhichReturnsTrueOrfalse(), "reason for failure");

于 2010-01-04T20:01:17.510 回答
1

这是我处理两个可枚举的代码片段，并在 MS 测试中进行单元测试时抛出异常，它可能会有所帮助：

采用

比较两个枚举：

 MyAssert.AreEnumerableSame(expected,actual);

管理异常 

MyAssert.Throws<KeyNotFoundException>(() => repository.GetById(1), string.Empty);

代码

public class MyAssert
    {
        public class AssertAnswer
        {
            public bool Success { get; set; }
            public string Message { get; set; }
        }

        public static void Throws<T>(Action action, string expectedMessage) where T : Exception
        {
            AssertAnswer answer = AssertAction<T>(action, expectedMessage);

            Assert.IsTrue(answer.Success);
            Assert.AreEqual(expectedMessage, answer.Message);
        }

        public static void AreEnumerableSame(IEnumerable<object> enumerable1, IEnumerable<object> enumerable2)
        {
            bool isSameEnumerable = true;
            bool isSameObject ;

            if (enumerable1.Count() == enumerable2.Count())
            {
                foreach (object o1 in enumerable1)
                {
                    isSameObject = false;
                    foreach (object o2 in enumerable2)
                    {
                        if (o2.Equals(o1))
                        {
                            isSameObject = true;
                            break;
                        }
                    }
                    if (!isSameObject)
                    {
                        isSameEnumerable = false;
                        break;
                    }
                }
            }
            else
                isSameEnumerable = false;

            Assert.IsTrue(isSameEnumerable);
        }

        public static AssertAnswer AssertAction<T>(Action action, string expectedMessage) where T : Exception
        {
            AssertAnswer answer = new AssertAnswer();

            try
            {
                action.Invoke();

                answer.Success = false;
                answer.Message = string.Format("Exception of type {0} should be thrown.", typeof(T));
            }
            catch (T exc)
            {
                answer.Success = true;
                answer.Message = expectedMessage;
            }
            catch (Exception e)
            {
                answer.Success = false;
                answer.Message = string.Format("A different Exception was thrown {0}.", e.GetType());
            }

            return answer;
        }
    }
于 2011-09-06T09:23:56.597 回答
0

NUnit 有CollectionAssert一系列有助于提高可读性的断言。

于 2010-01-04T20:08:12.563 回答