如何使用 NUnit 在 C# 中断言枚举

Question

我在 .NET C# 项目上使用 NUnit

我需要断言 historyRecord.InstrType 等于 InstrType.Nanodac

我有一个类型为 InstrType

的变量 myVal

其中 InstrType 是一个枚举：

public enum InstrType
{
HydraSbs,
HydraLbs,
HydraSfs,
HydraLfs,
HydraEconomique,
Blind,
Lxio,
Sxio,
Sfse,
T800QVga,
T800SVGa,
Eycon10,
Eycon20,
T2550,
T2750,
Nanodac
}

我需要声明：

Assert.AreEqual(myVal, InstrType.Nanodac)

但它会引发异常 ("expected Nanodac but was HydraSbs")。所以我尝试了这个：

Assert.That(myVal, Is.EqualTo(InstrType.Nanodac))

再次引发相同的异常！

我用调试器进行了测试，myVal 被正确地赋值为 InstrType.Nanodac

我闻到枚举不好，因为它选择了列表的第一个值 (hydraSbs)

Answer 1

这只是一个建议，我会将两者都转换为 int 然后进行比较。

这是一个例子

Assert.AreEqual((int)myVal, (int)InstrType.Nanodac)

或者您可以将预期结果移到左侧，避免转换。

Assert.AreEqual(InstrType.Nanodac, myVal)

p.s。很高兴 clean/rebuild 成功了。

Answer 2

我需要清理并重建项目才能使其正常工作。

Answer 3

首先，您的原始断言应该可以正常工作，即使参数在技术上是错误的。

我的猜测是该值实际上没有正确设置。所以在这种情况下断言会抛出正确的错误消息。

示例代码： TestMethod1 显示断言工作正常。 TestMethod2 是一个示例，说明该值实际上并未沿线某处设置。

using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace UnitTestProject1
{
    public enum InstrType
    {
        HydraSbs,           // = 0
        HydraLbs,           // = 1
        HydraSfs,           // = 2
        HydraLfs,           // = 3
        HydraEconomique,    // = 4
        Blind,              // = 5
        Lxio,               // = 6
        Sxio,               // = 7
        Sfse,               // = 8
        T800QVga,           // = 9
        T800SVGa,           // = 10
        Eycon10,            // = 11
        Eycon20,            // = 12
        T2550,              // = 13
        T2750,              // = 14
        Nanodac             // = 15
    }

    public class HistoryRecord
    {
        public InstrType InstructionType { get; set; }

        public HistoryRecord(InstrType instructionType)
        {
            //NOTE: Possible bug here
            //We could possibly be missing this assignment perhaps:
            //InstructionType = instructionType;
        }
    }

    [TestClass]
    public class UnitTest1
    {
        /// <summary>
        /// This method should pass
        /// </summary>
        [TestMethod]
        public void TestMethod1()
        {
            var myVal = InstrType.Nanodac;
            Assert.AreEqual(InstrType.Nanodac, myVal);
        }

        /// <summary>
        /// This method should fail with -> Expected:<Nanodac>. Actual:<HydraSbs>
        /// </summary>
        [TestMethod]
        public void TestMethod2()
        {
            // Please check the 'HistoryRecord' class above for the possible error
            // Here the the value of InstructionType has not actually been set yet, so will default to 0 in the underlying datatype (int)
            // In this case that underlying 0 value will be mapped to the first enum value which is HydraSbs
            // that is why you'd get the error -> Expected:<Nanodac>. Actual:<HydraSbs>
            var historyRecord = new HistoryRecord(InstrType.Nanodac);
            var myVal = historyRecord.InstructionType;

            var intValue = (int)myVal;
            Assert.AreEqual(0, intValue);

            Assert.AreEqual(InstrType.Nanodac, myVal); 
        }
    }
}

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