CODEWITHSUNDEEP
visual-studiof#fsunit
kuang
kuang

Reputation: 727

FsUnit not defined

I'm learning F# recently. Today I wrote some code and tried to add unit tests.

I planed to create two projects, one is for code and the other is for test.

So I created a new solution called DataLab with a project called Source in Visual Studio 2015 Community. Then I added another project called Test.

The structure is like below:

Solution 'DataLab'
    Source
        Queue.fs
    Test
        QueueTest.fs

Queue.fs is:

namespace DataLab

type Queue<'a> = Queue of 'a list * 'a list

module Queue = 
    let init<'a> : Queue<'a> = Queue ([], [])

QueueTest.fs is:

namespace DataLab.Test

module QueueTest =
    open DataLab
    open FsUnit
    open NUnit.Framework

    [<Test>]
    let ``test Init`` () =
        let expected : Queue<int> = Queue ([], [])
        Queue.init<int> |> should equal expected

Then VS warned me about the open statements in QueueTest.fs. One of the three was:

The namespace or module 'FsUnit' is not defined

So I added reference to Source project for Test project. I also installed FsUnit via NuGet for Test project.

I didn't install NUnit because it's a dependency of FsUnit.

And I didn't install FsUnit for Source project because Source does not need testing libraries.
I wanted to make it similar to <scope>test</scope> thing for JUnit dependency in maven.

I built the whole solution successfully.

When I run my test in 'Test Explorer' (I also installed the 'NUnit3 Test Adapter' extension), I got error below:

System.MissingMethodException : Method not found: 'DataLab.Queue`1<!0> DataLab.Queue`1.NewQueue(Microsoft.FSharp.Collections.FSharpList`1<!0>, Microsoft.FSharp.Collections.FSharpList`1<!0>)'.

After some random try, I got the test executed successfully by installing FsUnit to Source project too.

I have a theory about this problem.

I installed FsUnit 2.0.0 which has a dependency of FSharp.Core (>= 3.1.2.5). So FSharp.Core 3.1.2.5 has also been installed to my Test project. And this polluted my Test.fsproj file. I have below lines in Test.fsproj:

<TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
<TargetFSharpCoreVersion>4.4.0.0</TargetFSharpCoreVersion>

<ItemGroup>
  <Reference Include="FSharp.Core">
    <HintPath>..\packages\FSharp.Core.3.1.2.5\lib\net40\FSharp.Core.dll</HintPath>
    <Private>True</Private>
  </Reference>

Meanwhile the Source project still using VS 2015 built-in F#, whose version is 4.0+ . So the two versions of F# conflict.

But I don't know how to prove it or how to fix it.

Upvotes: 0

Views: 250

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