测试带有函数参数的函数时,缺少MissingMethodException [英] MissingMethodException when testing a function that takes a function parameter
问题描述
我正在使用FsUnit 2.1(带有NUnit 3.2)来为F#项目编写测试.这是一个简单的模块:
I am using FsUnit 2.1 (with NUnit 3.2) to write tests for an F# project. Here is a simple module:
namespace Library1
module LibraryFunctions =
let Execute f1 = f1()
let Id x = x
这是我的测试:
namespace Tests
open FsUnit
open NUnit.Framework
open Library1
[<TestFixture>]
type Tests() =
[<Test>]
// Passes
member x.``LibraryFunctions.Id should return the value``() =
LibraryFunctions.Id 42 |> should equal 42
[<Test>]
// Fails
member x.``LibraryFunctions.Execute should return the result of the function``() =
let f() = 42
LibraryFunctions.Execute f |> should equal 42
第二次测试失败(在NCrunch和ReSharper中),并显示以下消息:
The second test fails (in NCrunch and ReSharper) with the message:
System.MissingMethodException : Method not found: '!!0 Library1.LibraryFunctions.Execute(Microsoft.FSharp.Core.FSharpFunc`2<Microsoft.FSharp.Core.Unit,!!0>)'.
如果将要测试的模块放在与测试相同的代码文件中(而不是放在单独的VS项目中),则测试通过.我的怀疑是这是由于NUnit和F#/C#互操作的某些问题引起的.如果是这样,如何解决?
If I put the module under test in the same code file as the tests (rather than in a separate VS project) the test passes. My suspicion is that this is due to some issue with NUnit and F#/C# interop. If so, how can it be resolved?
推荐答案
This is a known issue with FsUnit and other projects (see here and here).
作为解决方法,您可以将其添加到您的app.config文件中:
As a workaround, you can add this to your app.config file:
<configuration>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-4.3.0.0" newVersion="4.3.0.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>
注意:您需要将FsUnit程序集所使用的FSharp.Core
版本更新为4.3.0.0
,以及更新的时间.
NB: you'll need update4.3.0.0
to whatever version of FSharp.Core
your FsUnit assembly is using, as and when it is updated.
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