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C#单元测试中的双向列表比较

readability coding-style unit-testing c#

Sarah Vessels · 技术社区 · 15 年前

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,至少找到一行具有该ID;2)对于所有返回的行,每行都有一个ID,该ID位于要查找的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 Any 和 All

编辑:

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 回复 | 直到 15 年前

Aviad P. 15 年前

您可以选择使用 Except 接线员:

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");

Carl Manaster 15 年前

在国际海事组织,它的可读性不如它所能。创建并记录一个返回true/false的方法。然后调用Assert.IsTrue(methodWithDescriptiveNameWhichReturnsTrueOrfalse(),“失败原因”);

Arthis 13 年前

下面是我为处理两个可枚举项而编写的代码片段,在MS test中执行单元测试时引发异常,这可能会有所帮助:

比较两个可枚举项:

 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;
        }
    }

Peter Seale 15 年前

CollectionAssert 有助于可读性的断言系列。