NUnit System.OverflowException:算术运算导致溢出

我开发了一个小型Windows窗体应用程序，允许用户在三个温标（华氏度、摄氏度和开尔文）的不同值之间进行转换。作为一名新手测试人员，我开始接触NUnit，我认为学习该框架的一个好方法是在这个程序中添加一些测试代码。处理大部分工作的类是：-

public static class TemperatureConverter
{
    public static ConversionFormula CelciusToFahrenheit = t => ((t * 1.8) + 32);
    public static ConversionFormula CelciusToKelvin = t => (t + 273);
    public static ConversionFormula FahrenheitToCelcius = t => ((t - 32) * 5/9);
    public static ConversionFormula FahrenheitToKelvin = t => (t + 459.67)/1.8;
    public static ConversionFormula KelvinToCelcius = t => (t - 273);
    public static ConversionFormula KelvinToFahrenheit = t => (t * 9/5 - 459.67);

    public static double ConvertTemperature(double temperatureValue, ConversionFormula conversionFormula)
    {           
        return conversionFormula(temperatureValue);
    }
}

我一开始只是简单地测试各个温度值是否正确转换。最终，这变得很累，并且涉及到很多重复的代码，所以我没有为每个值编写一个测试，而是使用NUnit的"Range"answers"Values"属性，这样我就可以以十个为一批进行测试。一个示例测试方法是：-

[TestFixture]
public class Class1
{
    private ConversionFormula _fahrenheitToCelcius;
    [SetUp]
    public void Init()
    {
        _fahrenheitToCelcius = TemperatureConverter.FahrenheitToCelcius;
    }
    #region Fahrenheit To Celcius Positive Values
    [Test, Sequential]
    public void ConvertFahrenheitToCelciusRange_0_To_10_RoundedTo2DP([Range(0, 10, 1)]double temperature,
                [Values(-17.78, -17.22, -16.67, -16.11, -15.56, -15, -14.44, -13.89, -13.33, -12.78, -12.22)]double expected)
    {
        double actual = TemperatureConverter.ConvertTemperature(temperature, _fahrenheitToCelcius);
        Assert.AreEqual(expected, actual, 1);
    }

范围值是要测试的温度，在这种情况下，从0到10。values属性包含每个测试的预期结果。我使用的是NUnit 2.6.2和Resharper Test Runner。我在一个类文件中添加了几乎相同的测试方法，将温度范围提高到10。例如，下一个测试将是：-

[Test, Sequential]
    public void ConvertFahrenheitToCelciusRange_11_To_20_RoundedTo2DP([Range(11, 20, 1)]double temperature,
                [Values(-11.67, -11.11, -10.56, -10, -9.44, -8.89, -8.33, -7.78, -7.22, -6.67)]double expected)
    {
        double actual = TemperatureConverter.ConvertTemperature(temperature, _fahrenheitToCelcius);
        Assert.AreEqual(expected, actual, 1);
    }

每次添加测试后，我都会运行它，看看它是否通过了测试。最终，我测试了0-150的范围，所以我每节课总共有15种测试方法。现在出现了一个问题。Resharper测试运行程序和NUnit测试运行程序都随机报告

NUnit System.OverflowException：算术运算导致溢出

    System.OverflowException...
Server stack trace: 
   at NUnit.Framework.RangeAttribute..ctor(Int32 from, Int32 to, Int32 step)
   at System.Reflection.CustomAttribute._CreateCaObject(RuntimeModule pModule, IRuntimeMethodInfo pCtor, Byte** ppBlob, Byte* pEndBlob, Int32* pcNamedArgs)
   at System.Reflection.CustomAttribute.CreateCaObject(RuntimeModule module, IRuntimeMethodInfo ctor, IntPtr& blob, IntPtr blobEnd, Int32& namedArgs)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeParameterInfo parameter, RuntimeType caType)
   at NUnit.Core.Reflect.GetAttributes(ICustomAttributeProvider member, Boolean inherit)
   at NUnit.Core.Reflect.HasAttribute(ICustomAttributeProvider member, String attrName, Boolean inherit)
   at NUnit.Core.Builders.ValueSourceProvider.HasDataFor(ParameterInfo parameter)
   at NUnit.Core.Extensibility.DataPointProviders.HasDataFor(ParameterInfo parameter)
   at NUnit.Core.Builders.CombinatorialTestCaseProvider.HasTestCasesFor(MethodInfo method)
   at NUnit.Core.Extensibility.TestCaseProviders.HasTestCasesFor(MethodInfo method)
   at NUnit.Core.Builders.NUnitTestCaseBuilder.BuildFrom(MethodInfo method, Test parentSuite)
   at NUnit.Core.Extensibility.TestCaseBuilderCollection.BuildFrom(MethodInfo method, Test suite)
   at NUnit.Core.Builders.NUnitTestFixtureBuilder.BuildTestCase(MethodInfo method, TestSuite suite)
   at NUnit.Core.Builders.NUnitTestFixtureBuilder.AddTestCases(Type fixtureType)
   at NUnit.Core.Builders.NUnitTestFixtureBuilder.BuildSingleFixture(Type type, Attribute attr)
   at NUnit.Core.Builders.NUnitTestFixtureBuilder.BuildFrom(Type type)
   at NUnit.Core.Extensibility.SuiteBuilderCollection.BuildFrom(Type type)
   at NUnit.Core.TestFixtureBuilder.BuildFrom(Type type)
   at NUnit.Core.Builders.TestAssemblyBuilder.GetFixtures(Assembly assembly, String ns)
   at NUnit.Core.Builders.TestAssemblyBuilder.Build(String assemblyName, Boolean autoSuites)
   at NUnit.Core.Builders.TestAssemblyBuilder.Build(String assemblyName, String testName, Boolean autoSuites)
   at NUnit.Core.TestSuiteBuilder.BuildSingleAssembly(TestPackage package)
   at NUnit.Core.TestSuiteBuilder.Build(TestPackage package)
   at NUnit.Core.SimpleTestRunner.Load(TestPackage package)
   at NUnit.Core.ProxyTestRunner.Load(TestPackage package)
   at NUnit.Core.ProxyTestRunner.Load(TestPackage package)
   at NUnit.Core.RemoteTestRunner.Load(TestPackage package)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)
Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at NUnit.Core.TestRunner.Load(TestPackage package)
   at NUnit.Util.TestDomain.Load(TestPackage package)
   at NUnit.Core.ProxyTestRunner.Load(TestPackage package)
   at NUnit.Util.RemoteTestAgent.AgentRunner.Load(TestPackage package)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)
Exception rethrown at [1]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at NUnit.Core.TestRunner.Load(TestPackage package)
   at NUnit.Core.ProxyTestRunner.Load(TestPackage package)
   at NUnit.Util.ProcessRunner.Load(TestPackage package)
   at NUnit.Util.TestLoader.LoadTest(String testName)

无论我尝试重新运行测试多少次，我都会得到相同的错误。不仅如此，程序集中所有其他运行良好的测试文件现在都报告了相同的问题。起初，我认为传递到values或Range属性的值有问题，但为了进行测试，我创建了一个新的程序集，添加了对NUnit的引用，并将测试从原始程序集复制粘贴到新程序集。嘿，普雷斯托，测试都很顺利。现在，如果我不对新程序集中的测试文件进行任何更改，并不时运行测试，最终我会遇到同样的错误。不仅如此，所有其他测试类也会再次中断。唯一的解决方法是创建一个新的程序集，并在其中复制和通过旧的测试文件。这不好，因为它们最终会再次断裂。我是一个NUnit新手，所以如果有人以前遇到过这个错误，或者能够理解我在这里可能做错了什么，那么我们将非常感谢你的建议。