Question

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，至少有一行找到具有该ID且2）对于所有返回的行，每行具有要在其中找到的ID列表中的ID。以下是我通常如此确保：

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Any和All对于此类检查很方便，但我想知道是否有人认为这样可读性低于可能性，或者是否有更好的方式做这样的双向检查。我在Visual Studio 2008 Team System中使用MSTest进行单元测试。如果它过于主观，这可能应该是社区维基。

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()
);

Answer 1

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");

Answer 2

IMO，尽管不那么可读。创建并记录返回true / false的方法。然后调用Assert.IsTrue（methodWithDescriptiveNameWhichReturnsTrueOrfalse（），“失败的原因”）;

Answer 3

下面是我处理两个枚举的代码片段，并在进行单元测试时抛出异常在MS Test中，它可能会有所帮助：

使用

比较两个枚举：

 MyAssert.AreEnumerableSame(expected,actual);

管理例外

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;
        }
    }

Answer 4

NUnit具有CollectionAssert断言系列，有助于提高可读性。

C＃单元测试中的双向列表比较

4 个答案: