Bump ApiSurface from 4.0.41 to 4.0.42, WoofWare.Myriad.Plugins from 2.1.45 to 2.1.51 (#98)

* Bump WoofWare.Myriad.Plugins from 2.1.45 to 2.1.49

Bumps [WoofWare.Myriad.Plugins](https://github.com/Smaug123/WoofWare.Myriad) from 2.1.45 to 2.1.49.
- [Release notes](https://github.com/Smaug123/WoofWare.Myriad/releases)
- [Changelog](https://github.com/Smaug123/WoofWare.Myriad/blob/main/CHANGELOG.md)
- [Commits](https://github.com/Smaug123/WoofWare.Myriad/compare/WoofWare.Myriad.Plugins.2.1.45...WoofWare.Myriad.Plugins.2.1.49)

---
updated-dependencies:
- dependency-name: WoofWare.Myriad.Plugins
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

* Bump ApiSurface from 4.0.41 to 4.0.42

Bumps [ApiSurface](https://github.com/G-Research/ApiSurface) from 4.0.41 to 4.0.42.
- [Release notes](https://github.com/G-Research/ApiSurface/releases)
- [Commits](https://github.com/G-Research/ApiSurface/compare/ApiSurface.4.0.41...ApiSurface.4.0.42)

---
updated-dependencies:
- dependency-name: ApiSurface
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

* Deps

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Smaug123 <3138005+Smaug123@users.noreply.github.com>

.editorconfig

@@ -1,40 +1,40 @@
-root=true
+root = true
 
 [*]
-charset=utf-8
+charset = utf-8
-trim_trailing_whitespace=true
+trim_trailing_whitespace = true
-insert_final_newline=true
+insert_final_newline = true
-indent_style=space
+indent_style = space
-indent_size=4
+indent_size = 4
 
 # ReSharper properties
-resharper_xml_indent_size=2
+resharper_xml_indent_size = 2
-resharper_xml_max_line_length=100
+resharper_xml_max_line_length = 100
-resharper_xml_tab_width=2
+resharper_xml_tab_width = 2
 
 [*.{csproj,fsproj,sqlproj,targets,props,ts,tsx,css,json}]
-indent_style=space
+indent_style = space
-indent_size=2
+indent_size = 2
 
 [*.{fs,fsi}]
-fsharp_bar_before_discriminated_union_declaration=true
+fsharp_bar_before_discriminated_union_declaration = true
-fsharp_space_before_uppercase_invocation=true
+fsharp_space_before_uppercase_invocation = true
-fsharp_space_before_class_constructor=true
+fsharp_space_before_class_constructor = true
-fsharp_space_before_member=true
+fsharp_space_before_member = true
-fsharp_space_before_colon=true
+fsharp_space_before_colon = true
-fsharp_space_before_semicolon=true
+fsharp_space_before_semicolon = true
-fsharp_multiline_bracket_style=aligned
+fsharp_multiline_bracket_style = aligned
-fsharp_newline_between_type_definition_and_members=true
+fsharp_newline_between_type_definition_and_members = true
-fsharp_align_function_signature_to_indentation=true
+fsharp_align_function_signature_to_indentation = true
-fsharp_alternative_long_member_definitions=true
+fsharp_alternative_long_member_definitions = true
-fsharp_multi_line_lambda_closing_newline=true
+fsharp_multi_line_lambda_closing_newline = true
-fsharp_experimental_keep_indent_in_branch=true
+fsharp_experimental_keep_indent_in_branch = true
-fsharp_max_value_binding_width=80
+fsharp_max_value_binding_width = 80
-fsharp_max_record_width=0
+fsharp_max_record_width = 0
-max_line_length=120
+max_line_length = 120
-end_of_line=lf
+end_of_line = lf
 
 [*.{appxmanifest,build,dtd,nuspec,xaml,xamlx,xoml,xsd}]
-indent_style=space
+indent_style = space
-indent_size=2
+indent_size = 2
-tab_width=2
+tab_width = 2

.github/workflows/dotnet.yaml

@@ -38,7 +38,7 @@ jobs:
     - name: Build
       run: 'nix develop --command dotnet build --no-restore --configuration ${{matrix.config}}'
     - name: Test
-      run: 'nix develop --command dotnet test --no-build --verbosity normal --configuration ${{matrix.config}}'
+      run: 'nix develop --command dotnet test --no-build --verbosity normal --configuration ${{matrix.config}} --framework net8.0'
 
   selftest:
     runs-on: ubuntu-latest
@@ -71,7 +71,49 @@ jobs:
     - name: Build
       run: 'nix develop --command dotnet build --no-restore --configuration Release'
     - name: Test using self
-      run: 'nix develop --command dotnet exec ./WoofWare.NUnitTestRunner/bin/Release/net8.0/WoofWare.NUnitTestRunner.dll ./Consumer/bin/Release/net8.0/Consumer.dll --trx TrxOut/out.trx'
+      run: 'nix develop --command dotnet exec ./WoofWare.NUnitTestRunner/bin/Release/net6.0/WoofWare.NUnitTestRunner.dll ./Consumer/bin/Release/net8.0/Consumer.dll --trx TrxOut/out.trx'
+    - name: Parse Trx files
+      uses: NasAmin/trx-parser@v0.6.0
+      if: always()
+      id: trx-parser
+      with:
+        TRX_PATH: ${{ github.workspace }}/TrxOut
+        REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  selftest-net6:
+    runs-on: ubuntu-latest
+    permissions:
+      actions: none
+      checks: write
+      contents: read
+      deployments: none
+      id-token: none
+      issues: none
+      discussions: none
+      packages: none
+      pages: none
+      pull-requests: read
+      repository-projects: none
+      security-events: none
+      statuses: read
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0 # so that NerdBank.GitVersioning has access to history
+    - name: Install Nix
+      uses: cachix/install-nix-action@V27
+      with:
+        extra_nix_config: |
+          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+    - name: Restore dependencies
+      run: nix develop --command dotnet restore
+    - name: Build runner
+      run: 'nix develop --command dotnet build WoofWare.NUnitTestRunner --configuration Release'
+    - name: Build target
+      run: 'nix develop --command dotnet build Consumer --configuration Release'
+    - name: Test using self
+      run: 'nix develop .#net6 --command ./WoofWare.NUnitTestRunner/bin/Release/net6.0/WoofWare.NUnitTestRunner ./Consumer/bin/Release/net6.0/Consumer.dll --trx TrxOut/out.trx'
     - name: Parse Trx files
       uses: NasAmin/trx-parser@v0.6.0
       if: always()
@@ -255,7 +297,7 @@ jobs:
           name: nuget-package-lib
           path: packed
       - name: Attest Build Provenance
-        uses: actions/attest-build-provenance@897ed5eab6ed058a474202017ada7f40bfa52940 # v1.0.0
+        uses: actions/attest-build-provenance@bdd51370e0416ac948727f861e03c2f05d32d78e # v1.3.2
         with:
           subject-path: "packed/*.nupkg"
 
@@ -274,7 +316,7 @@ jobs:
           name: nuget-package-tool
           path: packed
       - name: Attest Build Provenance
-        uses: actions/attest-build-provenance@897ed5eab6ed058a474202017ada7f40bfa52940 # v1.0.0
+        uses: actions/attest-build-provenance@bdd51370e0416ac948727f861e03c2f05d32d78e # v1.3.2
         with:
           subject-path: "packed/*.nupkg"
 
@@ -316,7 +358,7 @@ jobs:
         run: 'bash ./.github/workflows/assert-contents.sh'
       - name: Attest Build Provenance
         if: steps.publish-success.outputs.result == 'published'
-        uses: actions/attest-build-provenance@897ed5eab6ed058a474202017ada7f40bfa52940 # v1.0.0
+        uses: actions/attest-build-provenance@bdd51370e0416ac948727f861e03c2f05d32d78e # v1.3.2
         with:
           subject-path: "from-nuget.nupkg"
 
@@ -358,7 +400,7 @@ jobs:
         run: 'bash ./.github/workflows/assert-contents.sh'
       - name: Attest Build Provenance
         if: steps.publish-success.outputs.result == 'published'
-        uses: actions/attest-build-provenance@897ed5eab6ed058a474202017ada7f40bfa52940 # v1.0.0
+        uses: actions/attest-build-provenance@bdd51370e0416ac948727f861e03c2f05d32d78e # v1.3.2
         with:
           subject-path: "from-nuget.nupkg"
 

Consumer/Consumer.fsproj

@@ -1,8 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
-
         <IsPackable>false</IsPackable>
         <IsTestProject>true</IsTestProject>
     </PropertyGroup>
@@ -10,6 +9,7 @@
     <ItemGroup>
         <Compile Include="NoAttribute.fs" />
         <Compile Include="Inconclusive.fs" />
+        <Compile Include="RunSubProcess.fs" />
         <Compile Include="TestNonParallel.fs" />
         <Compile Include="TestParallel.fs" />
         <Compile Include="TestStdout.fs" />
@@ -26,9 +26,9 @@
 
     <ItemGroup>
       <PackageReference Include="FsUnit" Version="6.0.0" />
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0"/>
+      <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0"/>
-        <PackageReference Include="NUnit" Version="4.1.0"/>
+      <PackageReference Include="NUnit" Version="4.1.0"/>
-        <PackageReference Include="NUnit3TestAdapter" Version="4.5.0"/>
+      <PackageReference Include="NUnit3TestAdapter" Version="4.5.0"/>
     </ItemGroup>
 
 </Project>

Consumer/RunSubProcess.fs

@@ -0,0 +1,45 @@
+namespace Consumer
+
+open System
+open System.Diagnostics
+open System.IO
+open System.IO.Compression
+open System.Text
+open NUnit.Framework
+open FsUnitTyped
+
+[<TestFixture>]
+module RunSubProcess =
+    [<Test>]
+    let ``Run a subprocess`` () =
+        let exe = "/bin/bash"
+        let args = [ "-c" ; "echo hi >&2 && echo bye" ]
+        let workingDir = None
+
+        let psi =
+            ProcessStartInfo (
+                exe,
+                UseShellExecute = false,
+                RedirectStandardError = true,
+                RedirectStandardOutput = true,
+                WorkingDirectory = Option.toObj workingDir
+            )
+
+        for arg in args do
+            psi.ArgumentList.Add arg
+
+        psi.EnvironmentVariables.Add ("THING", Path.Combine (AppDomain.CurrentDomain.BaseDirectory, "hi"))
+        let stderr = StringBuilder ()
+        use proc = new Process (StartInfo = psi)
+        proc.OutputDataReceived.Add (fun e -> printfn $"%s{e.Data}")
+
+        proc.ErrorDataReceived.Add (fun e ->
+            eprintfn $"%s{e.Data}"
+            stderr.AppendLine e.Data |> ignore
+        )
+
+        proc.Start () |> shouldEqual true
+        proc.BeginOutputReadLine ()
+        proc.BeginErrorReadLine ()
+
+        proc.WaitForExit ()

WoofWare.NUnitTestRunner.Lib/Args.fs

@@ -0,0 +1,99 @@
+namespace WoofWare.NUnitTestRunner
+
+open System
+open System.IO
+
+[<AutoOpen>]
+module internal Patterns =
+    let (|Key|_|) (start : string) (s : string) : string option =
+        if s.StartsWith (start + "=", StringComparison.Ordinal) then
+            s.Substring (start.Length + 1) |> Some
+        else
+            None
+
+/// Represents how verbose the test runner's logging should be.
+[<RequireQualifiedAccess>]
+type LogLevel =
+    /// Don't log any information about the test run.
+    | Nothing
+    /// Log as much information as is available about the test run.
+    | Verbose
+
+/// Arguments controlling the test runner itself (not the tests therein).
+type Args =
+    {
+        /// The DLL containing the tests we'll reflectively discover and invoke.
+        Dll : FileInfo
+        /// If set, the output file into which we will write a TRX report. (We'll create parent directories as necessary.)
+        Trx : FileInfo option
+        /// Also contains the original string which specified the filter.
+        Filter : (string * Filter) option
+        /// How verbose to be with the test runner's own logging.
+        Logging : LogLevel
+        /// Maximum number of tests which can run concurrently. This setting overrides any LevelOfParallelism reflectively
+        /// extracted from the assembly under test.
+        LevelOfParallelism : int option
+        /// Abort if the test runner is running for longer than this timeout.
+        Timeout : TimeSpan option
+    }
+
+    /// Parse `argv` into a structured Args.
+    static member Parse (args : string list) : Args =
+        match args with
+        | [] -> failwith "The first arg must be a positional arg, the DLL to test."
+        | dll :: args ->
+
+        let rec go
+            (trx : FileInfo option)
+            (filter : (string * Filter) option)
+            (logging : LogLevel option)
+            (par : int option)
+            (timeout : TimeSpan option)
+            (args : string list)
+            =
+            match args with
+            | [] ->
+                {
+                    Dll = FileInfo dll
+                    Trx = trx
+                    Filter = filter
+                    Logging = logging |> Option.defaultValue LogLevel.Nothing
+                    LevelOfParallelism = par
+                    Timeout = timeout
+                }
+            | Key "--filter" filterStr :: rest
+            | "--filter" :: filterStr :: rest ->
+                match filter with
+                | Some _ -> failwith "Two conflicting filters; you can only specify --filter once"
+                | None -> go trx (Some (filterStr, Filter.parse filterStr)) logging par timeout rest
+            | Key "--trx" trxStr :: rest
+            | "--trx" :: trxStr :: rest ->
+                match trx with
+                | Some _ -> failwith "Two conflicting TRX outputs; you can only specify --trx once"
+                | None -> go (Some (FileInfo trxStr)) filter logging par timeout rest
+            | Key "--verbose" verboseStr :: rest
+            | "--verbose" :: verboseStr :: rest ->
+                match logging with
+                | Some _ -> failwith "Two conflicting --verbose outputs; you can only specify --verbose once"
+                | None ->
+                    let verbose =
+                        if Boolean.Parse verboseStr then
+                            LogLevel.Verbose
+                        else
+                            LogLevel.Nothing
+
+                    go trx filter (Some verbose) par timeout rest
+            | Key "--parallelism" parStr :: rest
+            | "--parallelism" :: parStr :: rest ->
+                match par with
+                | Some _ -> failwith "Two conflicting --parallelism outputs; you can only specify --parallelism once"
+                | None -> go trx filter logging (Some (Int32.Parse parStr)) timeout rest
+            | Key "--timeout-seconds" timeoutStr :: rest
+            | "--timeout-seconds" :: timeoutStr :: rest ->
+                match timeout with
+                | Some _ ->
+                    failwith "Two conflicting --timeout-seconds outputs; you can only specify --timeout-seconds once"
+                | None -> go trx filter logging par (Some (TimeSpan.FromSeconds (Int32.Parse timeoutStr |> float))) rest
+            | k :: _rest -> failwith $"Unrecognised arg %s{k}"
+
+        go None None None None None args

WoofWare.NUnitTestRunner.Lib/AssemblyLevelAttributes.fs

@@ -0,0 +1,58 @@
+namespace WoofWare.NUnitTestRunner
+
+open System.Reflection
+
+/// Attributes at the assembly level which control the behaviour of NUnit.
+type AssemblyLevelAttributes =
+    {
+        /// How many tests can be running at once, if anything's running in parallel.
+        Parallelism : int option
+        /// Whether the tests in this assembly can be parallelised at all.
+        Parallelizable : Parallelizable<AssemblyParallelScope> option
+    }
+
+[<RequireQualifiedAccess>]
+module AssemblyLevelAttributes =
+
+    /// Reflectively obtain the values of any relevant assembly attributes.
+    let get (assy : Assembly) : AssemblyLevelAttributes =
+        ((None, None), assy.CustomAttributes)
+        ||> Seq.fold (fun (levelPar, par) attr ->
+            match attr.AttributeType.FullName with
+            | "NUnit.Framework.LevelOfParallelismAttribute" ->
+                let arg = attr.ConstructorArguments |> Seq.exactlyOne |> _.Value |> unbox<int>
+
+                match levelPar with
+                | None -> (Some arg, par)
+                | Some existing ->
+                    failwith $"Assembly %s{assy.Location} declares parallelism %i{arg} and also %i{existing}"
+            | "NUnit.Framework.NonParallelizableAttribute" ->
+                match levelPar with
+                | None -> (Some 1, par)
+                | Some existing ->
+                    failwith
+                        $"Assembly %s{assy.Location} declares non-parallelizable and also parallelism %i{existing}"
+            | "NUnit.Framework.ParallelizableAttribute" ->
+                match par with
+                | Some _ -> failwith "Got multiple Parallelize attributes in assembly"
+                | None ->
+                    match attr.ConstructorArguments |> Seq.toList with
+                    | [] -> levelPar, Some (Parallelizable.Yes AssemblyParallelScope.Fixtures)
+                    | [ v ] ->
+                        match v.Value with
+                        | :? int as v ->
+                            match v with
+                            | 512 -> levelPar, Some (Parallelizable.Yes AssemblyParallelScope.Fixtures)
+                            | 256 -> levelPar, Some (Parallelizable.Yes AssemblyParallelScope.Children)
+                            | 257 -> failwith "ParallelScope.All is invalid on assemblies; only Fixtures or Children"
+                            | 1 -> failwith "ParallelScope.Self is invalid on assemblies; only Fixtures or Children"
+                            | v -> failwith $"Could not recognise value %i{v} of parallel scope on assembly"
+                        | v -> failwith $"Unexpectedly non-int value %O{v} of parallel scope on assembly"
+                    | _ -> failwith "unexpectedly got multiple args to Parallelizable on assembly"
+            | _ -> levelPar, par
+        )
+        |> fun (par, canPar) ->
+            {
+                Parallelizable = canPar
+                Parallelism = par
+            }

WoofWare.NUnitTestRunner.Lib/Context.fs

@@ -89,8 +89,13 @@ type TestContexts =
             AsyncLocal = local
         }
 
-    member internal this.Stdout : TextWriter = this.StdOutWriter
+    /// An output stream which will identify the ExecutionContext it's being written to from,
-    member internal this.Stderr : TextWriter = this.StdErrWriter
+    /// and will separate that output into its own stream internally.
+    member this.Stdout : TextWriter = this.StdOutWriter
+
+    /// An output stream which will identify the ExecutionContext it's being written to from,
+    /// and will separate that output into its own stream internally.
+    member this.Stderr : TextWriter = this.StdErrWriter
 
     member internal this.DumpStdout (id : OutputStreamId) : string =
         lock

WoofWare.NUnitTestRunner.Lib/CreateTrxReport.fs

@@ -0,0 +1,243 @@
+namespace WoofWare.NUnitTestRunner
+
+open System
+open System.Reflection
+
+/// Methods for constructing TRX reports.
+[<RequireQualifiedAccess>]
+module BuildTrxReport =
+
+    /// Build a TRX report from the given results.
+    let build
+        (assy : Assembly)
+        (creationTime : DateTimeOffset)
+        (startTime : DateTimeOffset)
+        (results : FixtureRunResults list)
+        : TrxReport
+        =
+        let finishTime = DateTimeOffset.Now
+        let finishTimeHumanReadable = finishTime.ToString @"yyyy-MM-dd HH:mm:ss"
+        let nowMachine = finishTime.ToString @"yyyy-MM-dd_HH_mm_ss"
+
+        let testListId = Guid.NewGuid ()
+
+        let testDefinitions, testEntries =
+            results
+            |> List.collect (fun results -> results.IndividualTestRunMetadata)
+            |> List.map (fun (data, _) ->
+                let defn =
+                    {
+                        Name = data.TestName
+                        Storage = assy.Location.ToLowerInvariant ()
+                        Id = data.TestId
+                        Execution =
+                            {
+                                Id = data.ExecutionId
+                            }
+                        TestMethod =
+                            {
+                                CodeBase = assy.Location
+                                AdapterTypeName = Uri "executor://woofware/"
+                                ClassName = data.ClassName
+                                Name = data.TestName
+                            }
+                    }
+
+                let entry : TrxTestEntry =
+                    {
+                        TestListId = testListId
+                        ExecutionId = data.ExecutionId
+                        TestId = data.TestId
+
+                    }
+
+                defn, entry
+            )
+            |> List.unzip
+
+        let hostname = Environment.MachineName
+
+        let settings =
+            {
+                Name = "default"
+                Id = Guid.NewGuid ()
+                Deployment =
+                    {
+                        RunDeploymentRoot = $"_%s{hostname}_%s{nowMachine}"
+                    }
+            }
+
+        let testList : TrxTestListEntry =
+            {
+                Id = testListId
+                Name = "All"
+            }
+
+        let counters =
+            (TrxCounters.Zero, results)
+            // TODO: this is woefully inefficient
+            ||> List.fold (fun counters results ->
+                let counters =
+                    (counters, results.Failed)
+                    ||> List.fold (fun counters (_, _) ->
+                        // TODO: the counters can be more specific about the failure mode
+                        counters.AddFailed ()
+                    )
+
+                let counters =
+                    (counters, results.OtherFailures)
+                    ||> List.fold (fun counters _ ->
+                        // TODO: the counters can be more specific about the failure mode
+                        counters.AddFailed ()
+                    )
+
+                (counters, results.Success)
+                ||> List.fold (fun counters (_, success, _) ->
+                    match success with
+                    | TestMemberSuccess.Ok -> counters.AddPassed ()
+                    | TestMemberSuccess.Ignored _
+                    | TestMemberSuccess.Explicit _ -> counters.AddNotExecuted ()
+                    | TestMemberSuccess.Inconclusive _ -> counters.AddInconclusive ()
+                )
+            )
+
+        // TODO: I'm sure we can do better than this; there's a whole range of possible
+        // states!
+        let outcome =
+            if counters.Failed > 0u then
+                TrxOutcome.Failed
+            else
+                TrxOutcome.Completed
+
+        let resultSummary : TrxResultsSummary =
+            {
+                Outcome = outcome
+                Counters = counters
+                Output =
+                    {
+                        StdOut = None
+                        StdErr = None
+                        ErrorInfo = None
+                    }
+                RunInfos =
+                    [
+                    // TODO: capture stdout
+                    ]
+            }
+
+        let times : TrxReportTimes =
+            {
+                Creation = creationTime
+                Queuing = startTime
+                Start = startTime
+                Finish = finishTime
+
+            }
+
+        let magicGuid = Guid.Parse "13cdc9d9-ddb5-4fa4-a97d-d965ccfc6d4b"
+
+        let results =
+            results
+            |> List.collect (fun results -> results.IndividualTestRunMetadata)
+            |> List.map (fun (i, cause) ->
+                let exc =
+                    match cause with
+                    | Choice2Of3 _ -> None
+                    | Choice1Of3 (TestMemberFailure.Malformed reasons) ->
+                        {
+                            StackTrace = None
+                            Message = reasons |> String.concat "\n" |> Some
+                        }
+                        |> Some
+                    | Choice1Of3 (TestMemberFailure.Failed fail)
+                    | Choice1Of3 (TestMemberFailure.Failed fail)
+                    | Choice1Of3 (TestMemberFailure.Failed fail) ->
+                        ((None, None), fail)
+                        ||> List.fold (fun (stackTrace, message) tf ->
+                            match tf with
+                            | TestFailure.TestFailed (UserMethodFailure.Threw (_, exc))
+                            | TestFailure.SetUpFailed (UserMethodFailure.Threw (_, exc))
+                            | TestFailure.TearDownFailed (UserMethodFailure.Threw (_, exc)) ->
+                                let stackTrace =
+                                    match stackTrace with
+                                    | None -> (exc : Exception).ToString ()
+                                    | Some s -> s
+
+                                (Some stackTrace, message)
+                            | TestFailure.TestFailed (UserMethodFailure.ReturnedNonUnit (_, ret))
+                            | TestFailure.SetUpFailed (UserMethodFailure.ReturnedNonUnit (_, ret))
+                            | TestFailure.TearDownFailed (UserMethodFailure.ReturnedNonUnit (_, ret)) ->
+                                let newMessage = $"returned non-unit value %O{ret}"
+
+                                let message =
+                                    match message with
+                                    | None -> newMessage
+                                    | Some message -> $"%s{message}\n%s{newMessage}"
+
+                                (stackTrace, Some message)
+                        )
+                        |> fun (stackTrace, message) ->
+                            {
+                                StackTrace = stackTrace
+                                Message = message
+                            }
+                            |> Some
+                    | Choice3Of3 (UserMethodFailure.Threw (_, exc)) ->
+                        {
+                            StackTrace = (exc : Exception).ToString () |> Some
+                            Message = None
+                        }
+                        |> Some
+                    | Choice3Of3 (UserMethodFailure.ReturnedNonUnit (_, ret)) ->
+                        {
+                            Message = $"returned non-unit value %O{ret}" |> Some
+                            StackTrace = None
+                        }
+                        |> Some
+
+                let outcome =
+                    match cause with
+                    | Choice1Of3 _ -> TrxTestOutcome.Failed
+                    | Choice2Of3 TestMemberSuccess.Ok -> TrxTestOutcome.Passed
+                    | Choice2Of3 (TestMemberSuccess.Inconclusive _) -> TrxTestOutcome.Inconclusive
+                    | Choice2Of3 (TestMemberSuccess.Ignored _)
+                    | Choice2Of3 (TestMemberSuccess.Explicit _) -> TrxTestOutcome.NotExecuted
+                    // TODO: we can totally do better here, more fine-grained classification
+                    | Choice3Of3 _ -> TrxTestOutcome.Failed
+
+                {
+                    ExecutionId = i.ExecutionId
+                    TestId = i.TestId
+                    TestName = i.TestName
+                    ComputerName = i.ComputerName
+                    Duration = i.End - i.Start
+                    StartTime = i.Start
+                    EndTime = i.End
+                    TestType = magicGuid
+                    Outcome = outcome
+                    TestListId = testListId
+                    RelativeResultsDirectory = i.ExecutionId.ToString () // for some reason
+                    Output =
+                        match i.StdOut, i.StdErr, exc with
+                        | None, None, None -> None
+                        | stdout, stderr, exc ->
+                            Some
+                                {
+                                    TrxOutput.StdOut = stdout
+                                    StdErr = stderr
+                                    ErrorInfo = exc
+                                }
+                }
+            )
+
+        {
+            Id = Guid.NewGuid ()
+            Name = $"@%s{hostname} %s{finishTimeHumanReadable}"
+            Times = times
+            Settings = settings
+            Results = results
+            TestDefinitions = testDefinitions
+            TestEntries = testEntries
+            TestLists = [ testList ]
+            ResultsSummary = resultSummary
+        }

WoofWare.NUnitTestRunner.Lib/SurfaceBaseline.txt

@@ -1,3 +1,26 @@
+WoofWare.NUnitTestRunner.Args inherit obj, implements WoofWare.NUnitTestRunner.Args System.IEquatable, System.Collections.IStructuralEquatable
+WoofWare.NUnitTestRunner.Args..ctor [constructor]: (System.IO.FileInfo, System.IO.FileInfo option, (string * WoofWare.NUnitTestRunner.Filter) option, WoofWare.NUnitTestRunner.LogLevel, int option, System.TimeSpan option)
+WoofWare.NUnitTestRunner.Args.Dll [property]: [read-only] System.IO.FileInfo
+WoofWare.NUnitTestRunner.Args.Filter [property]: [read-only] (string * WoofWare.NUnitTestRunner.Filter) option
+WoofWare.NUnitTestRunner.Args.get_Dll [method]: unit -> System.IO.FileInfo
+WoofWare.NUnitTestRunner.Args.get_Filter [method]: unit -> (string * WoofWare.NUnitTestRunner.Filter) option
+WoofWare.NUnitTestRunner.Args.get_LevelOfParallelism [method]: unit -> int option
+WoofWare.NUnitTestRunner.Args.get_Logging [method]: unit -> WoofWare.NUnitTestRunner.LogLevel
+WoofWare.NUnitTestRunner.Args.get_Timeout [method]: unit -> System.TimeSpan option
+WoofWare.NUnitTestRunner.Args.get_Trx [method]: unit -> System.IO.FileInfo option
+WoofWare.NUnitTestRunner.Args.LevelOfParallelism [property]: [read-only] int option
+WoofWare.NUnitTestRunner.Args.Logging [property]: [read-only] WoofWare.NUnitTestRunner.LogLevel
+WoofWare.NUnitTestRunner.Args.Parse [static method]: string list -> WoofWare.NUnitTestRunner.Args
+WoofWare.NUnitTestRunner.Args.Timeout [property]: [read-only] System.TimeSpan option
+WoofWare.NUnitTestRunner.Args.Trx [property]: [read-only] System.IO.FileInfo option
+WoofWare.NUnitTestRunner.AssemblyLevelAttributes inherit obj, implements WoofWare.NUnitTestRunner.AssemblyLevelAttributes System.IEquatable, System.Collections.IStructuralEquatable, WoofWare.NUnitTestRunner.AssemblyLevelAttributes System.IComparable, System.IComparable, System.Collections.IStructuralComparable
+WoofWare.NUnitTestRunner.AssemblyLevelAttributes..ctor [constructor]: (int option, WoofWare.NUnitTestRunner.AssemblyParallelScope WoofWare.NUnitTestRunner.Parallelizable option)
+WoofWare.NUnitTestRunner.AssemblyLevelAttributes.get_Parallelism [method]: unit -> int option
+WoofWare.NUnitTestRunner.AssemblyLevelAttributes.get_Parallelizable [method]: unit -> WoofWare.NUnitTestRunner.AssemblyParallelScope WoofWare.NUnitTestRunner.Parallelizable option
+WoofWare.NUnitTestRunner.AssemblyLevelAttributes.Parallelism [property]: [read-only] int option
+WoofWare.NUnitTestRunner.AssemblyLevelAttributes.Parallelizable [property]: [read-only] WoofWare.NUnitTestRunner.AssemblyParallelScope WoofWare.NUnitTestRunner.Parallelizable option
+WoofWare.NUnitTestRunner.AssemblyLevelAttributesModule inherit obj
+WoofWare.NUnitTestRunner.AssemblyLevelAttributesModule.get [static method]: System.Reflection.Assembly -> WoofWare.NUnitTestRunner.AssemblyLevelAttributes
 WoofWare.NUnitTestRunner.AssemblyParallelScope inherit obj, implements WoofWare.NUnitTestRunner.AssemblyParallelScope System.IEquatable, System.Collections.IStructuralEquatable, WoofWare.NUnitTestRunner.AssemblyParallelScope System.IComparable, System.IComparable, System.Collections.IStructuralComparable - union type with 2 cases
 WoofWare.NUnitTestRunner.AssemblyParallelScope+Tags inherit obj
 WoofWare.NUnitTestRunner.AssemblyParallelScope+Tags.Children [static field]: int = 0
@@ -12,6 +35,8 @@ WoofWare.NUnitTestRunner.AssemblyParallelScope.get_Tag [method]: unit -> int
 WoofWare.NUnitTestRunner.AssemblyParallelScope.IsChildren [property]: [read-only] bool
 WoofWare.NUnitTestRunner.AssemblyParallelScope.IsFixtures [property]: [read-only] bool
 WoofWare.NUnitTestRunner.AssemblyParallelScope.Tag [property]: [read-only] int
+WoofWare.NUnitTestRunner.BuildTrxReport inherit obj
+WoofWare.NUnitTestRunner.BuildTrxReport.build [static method]: System.Reflection.Assembly -> System.DateTimeOffset -> System.DateTimeOffset -> WoofWare.NUnitTestRunner.FixtureRunResults list -> WoofWare.NUnitTestRunner.TrxReport
 WoofWare.NUnitTestRunner.ClassParallelScope inherit obj, implements WoofWare.NUnitTestRunner.ClassParallelScope System.IEquatable, System.Collections.IStructuralEquatable, WoofWare.NUnitTestRunner.ClassParallelScope System.IComparable, System.IComparable, System.Collections.IStructuralComparable - union type with 4 cases
 WoofWare.NUnitTestRunner.ClassParallelScope+Tags inherit obj
 WoofWare.NUnitTestRunner.ClassParallelScope+Tags.All [static field]: int = 3
@@ -145,6 +170,20 @@ WoofWare.NUnitTestRunner.ITestProgress.OnTestMemberSkipped [method]: string -> u
 WoofWare.NUnitTestRunner.ITestProgress.OnTestMemberStart [method]: string -> unit
 WoofWare.NUnitTestRunner.LoadContext inherit System.Runtime.Loader.AssemblyLoadContext
 WoofWare.NUnitTestRunner.LoadContext..ctor [constructor]: (System.IO.FileInfo, System.IO.DirectoryInfo list, WoofWare.NUnitTestRunner.TestContexts)
+WoofWare.NUnitTestRunner.LogLevel inherit obj, implements WoofWare.NUnitTestRunner.LogLevel System.IEquatable, System.Collections.IStructuralEquatable, WoofWare.NUnitTestRunner.LogLevel System.IComparable, System.IComparable, System.Collections.IStructuralComparable - union type with 2 cases
+WoofWare.NUnitTestRunner.LogLevel+Tags inherit obj
+WoofWare.NUnitTestRunner.LogLevel+Tags.Nothing [static field]: int = 0
+WoofWare.NUnitTestRunner.LogLevel+Tags.Verbose [static field]: int = 1
+WoofWare.NUnitTestRunner.LogLevel.get_IsNothing [method]: unit -> bool
+WoofWare.NUnitTestRunner.LogLevel.get_IsVerbose [method]: unit -> bool
+WoofWare.NUnitTestRunner.LogLevel.get_Nothing [static method]: unit -> WoofWare.NUnitTestRunner.LogLevel
+WoofWare.NUnitTestRunner.LogLevel.get_Tag [method]: unit -> int
+WoofWare.NUnitTestRunner.LogLevel.get_Verbose [static method]: unit -> WoofWare.NUnitTestRunner.LogLevel
+WoofWare.NUnitTestRunner.LogLevel.IsNothing [property]: [read-only] bool
+WoofWare.NUnitTestRunner.LogLevel.IsVerbose [property]: [read-only] bool
+WoofWare.NUnitTestRunner.LogLevel.Nothing [static property]: [read-only] WoofWare.NUnitTestRunner.LogLevel
+WoofWare.NUnitTestRunner.LogLevel.Tag [property]: [read-only] int
+WoofWare.NUnitTestRunner.LogLevel.Verbose [static property]: [read-only] WoofWare.NUnitTestRunner.LogLevel
 WoofWare.NUnitTestRunner.Match inherit obj, implements WoofWare.NUnitTestRunner.Match System.IEquatable, System.Collections.IStructuralEquatable, WoofWare.NUnitTestRunner.Match System.IComparable, System.IComparable, System.Collections.IStructuralComparable - union type with 2 cases
 WoofWare.NUnitTestRunner.Match+Contains inherit WoofWare.NUnitTestRunner.Match
 WoofWare.NUnitTestRunner.Match+Contains.get_Item [method]: unit -> string
@@ -226,6 +265,10 @@ WoofWare.NUnitTestRunner.SingleTestMethodModule inherit obj
 WoofWare.NUnitTestRunner.SingleTestMethodModule.parse [static method]: string list -> System.Reflection.MethodInfo -> System.Reflection.CustomAttributeData list -> (WoofWare.NUnitTestRunner.SingleTestMethod option * System.Reflection.CustomAttributeData list)
 WoofWare.NUnitTestRunner.TestContexts inherit obj, implements WoofWare.NUnitTestRunner.TestContexts System.IEquatable, System.Collections.IStructuralEquatable, IDisposable
 WoofWare.NUnitTestRunner.TestContexts.Empty [static method]: unit -> WoofWare.NUnitTestRunner.TestContexts
+WoofWare.NUnitTestRunner.TestContexts.get_Stderr [method]: unit -> System.IO.TextWriter
+WoofWare.NUnitTestRunner.TestContexts.get_Stdout [method]: unit -> System.IO.TextWriter
+WoofWare.NUnitTestRunner.TestContexts.Stderr [property]: [read-only] System.IO.TextWriter
+WoofWare.NUnitTestRunner.TestContexts.Stdout [property]: [read-only] System.IO.TextWriter
 WoofWare.NUnitTestRunner.TestFailure inherit obj, implements WoofWare.NUnitTestRunner.TestFailure System.IEquatable, System.Collections.IStructuralEquatable - union type with 3 cases
 WoofWare.NUnitTestRunner.TestFailure+SetUpFailed inherit WoofWare.NUnitTestRunner.TestFailure
 WoofWare.NUnitTestRunner.TestFailure+SetUpFailed.get_Item [method]: unit -> WoofWare.NUnitTestRunner.UserMethodFailure
@@ -356,6 +399,7 @@ WoofWare.NUnitTestRunner.TestMemberSuccess.Ok [static property]: [read-only] Woo
 WoofWare.NUnitTestRunner.TestMemberSuccess.Tag [property]: [read-only] int
 WoofWare.NUnitTestRunner.TestProgress inherit obj
 WoofWare.NUnitTestRunner.TestProgress.toStderr [static method]: unit -> WoofWare.NUnitTestRunner.ITestProgress
+WoofWare.NUnitTestRunner.TestProgress.toWriter [static method]: System.IO.TextWriter -> WoofWare.NUnitTestRunner.ITestProgress
 WoofWare.NUnitTestRunner.TrxCounters inherit obj, implements WoofWare.NUnitTestRunner.TrxCounters System.IEquatable, System.Collections.IStructuralEquatable
 WoofWare.NUnitTestRunner.TrxCounters..ctor [constructor]: (System.UInt32, System.UInt32, System.UInt32, System.UInt32, System.UInt32, System.UInt32, System.UInt32, System.UInt32, System.UInt32, System.UInt32, System.UInt32, System.UInt32, System.UInt32, System.UInt32, System.UInt32, System.UInt32)
 WoofWare.NUnitTestRunner.TrxCounters.Aborted [property]: [read-only] System.UInt32

WoofWare.NUnitTestRunner.Lib/TestProgress.fs

@@ -1,6 +1,7 @@
 namespace WoofWare.NUnitTestRunner
 
 open System
+open System.IO
 
 /// Represents something which knows how to report progress through a test suite.
 /// Note that we don't guarantee anything about parallelism; you must make sure
@@ -24,22 +25,25 @@ type ITestProgress =
 /// Methods for constructing specific ITestProgress objects.
 [<RequireQualifiedAccess>]
 module TestProgress =
-    /// An ITestProgress which logs to stderr.
+    /// An ITestProgress which logs to the given writer.
-    let toStderr () : ITestProgress =
+    let toWriter (writer : TextWriter) : ITestProgress =
         { new ITestProgress with
             member _.OnTestFixtureStart name testCount =
                 let plural = if testCount = 1 then "" else "s"
-                Console.Error.WriteLine $"Running test fixture: %s{name} (%i{testCount} test%s{plural} to run)"
+                writer.WriteLine $"Running test fixture: %s{name} (%i{testCount} test%s{plural} to run)"
 
             member _.OnTestMemberStart name =
-                Console.Error.WriteLine $"Running test: %s{name}"
+                writer.WriteLine $"Running test: %s{name}"
 
             member _.OnTestFailed name failure =
-                Console.Error.WriteLine $"Test failed: %O{failure}"
+                writer.WriteLine $"Test failed: %O{failure}"
 
             member _.OnTestMemberFinished name =
-                Console.Error.WriteLine $"Finished test %s{name}"
+                writer.WriteLine $"Finished test %s{name}"
 
             member _.OnTestMemberSkipped name =
-                Console.Error.WriteLine $"Skipping test due to filter: %s{name}"
+                writer.WriteLine $"Skipping test due to filter: %s{name}"
         }
+
+    /// An ITestProgress which logs to stderr.
+    let toStderr () : ITestProgress = toWriter Console.Error

WoofWare.NUnitTestRunner.Lib/WoofWare.NUnitTestRunner.Lib.fsproj

@@ -14,7 +14,7 @@
       <PackageId>WoofWare.NUnitTestRunner.Lib</PackageId>
       <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
       <WarnOn>FS3559</WarnOn>
-      <WoofWareMyriadPluginVersion>2.1.45</WoofWareMyriadPluginVersion>
+      <WoofWareMyriadPluginVersion>2.1.51</WoofWareMyriadPluginVersion>
     </PropertyGroup>
 
     <ItemGroup>
@@ -29,6 +29,7 @@
       <Compile Include="Result.fs" />
       <Compile Include="Domain.fs" />
       <Compile Include="Filter.fs" />
+      <Compile Include="Args.fs" />
       <Compile Include="ParallelQueue.fs" />
       <Compile Include="SingleTestMethod.fs" />
       <Compile Include="TestProgress.fs" />
@@ -36,6 +37,8 @@
       <Compile Include="TestFixture.fs" />
       <Compile Include="Xml.fs" />
       <Compile Include="TrxReport.fs" />
+      <Compile Include="CreateTrxReport.fs" />
+      <Compile Include="AssemblyLevelAttributes.fs" />
       <None Include="..\README.md">
         <Pack>True</Pack>
         <PackagePath>\</PackagePath>
@@ -44,14 +47,14 @@
       <EmbeddedResource Include="version.json" />
     </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="WoofWare.PrattParser" Version="0.2.1" />
+    <PackageReference Include="WoofWare.PrattParser" Version="0.2.2" />
     <PackageReference Update="FSharp.Core" Version="6.0.0" />
     <PackageReference Include="WoofWare.DotnetRuntimeLocator" Version="0.1.9" />
     <PackageReference Include="WoofWare.Myriad.Plugins.Attributes" Version="3.1.7" />
-    <PackageReference Include="Myriad.SDK" Version="0.8.3" />
+    <PackageReference Include="Myriad.SDK" Version="0.8.3" PrivateAssets="all" />
     <PackageReference Include="WoofWare.Myriad.Plugins" Version="$(WoofWareMyriadPluginVersion)" PrivateAssets="all" />
   </ItemGroup>
-  
+
   <ItemGroup>
     <MyriadSdkGenerator Include="$(NuGetPackageRoot)/woofware.myriad.plugins/$(WoofWareMyriadPluginVersion)/lib/net6.0/WoofWare.Myriad.Plugins.dll" />
   </ItemGroup>

WoofWare.NUnitTestRunner.Lib/version.json

@@ -1,5 +1,5 @@
 {
-  "version": "0.13",
+  "version": "0.16",
   "publicReleaseRefSpec": [
     "^refs/heads/main$"
   ],
@@ -8,4 +8,4 @@
     ":/Directory.Build.props",
     ":/README.md"
   ]
-}
+}

WoofWare.NUnitTestRunner.StartupHook/StartupHook.cs

@@ -0,0 +1,35 @@
+using System.Linq;
+using System.Reflection;
+using System.Runtime.Loader;
+using WoofWare.NUnitTestRunner.StartupHook;
+
+namespace WoofWare.NUnitTestRunner.StartupHook
+{
+    internal class StartupAssemblyLoadContext : AssemblyLoadContext
+    {
+        private readonly AssemblyDependencyResolver _resolver;
+
+        public StartupAssemblyLoadContext()
+        {
+            _resolver = new AssemblyDependencyResolver(Assembly.GetExecutingAssembly().Location);
+        }
+
+        protected override Assembly Load(AssemblyName assemblyName)
+        {
+            var assemblyPath = _resolver.ResolveAssemblyToPath(assemblyName);
+
+            return assemblyPath != null ? LoadFromAssemblyPath(assemblyPath) : null;
+        }
+    }
+}
+
+// Must be internal and called `StartupHook`
+internal class StartupHook
+{
+    public static void Initialize()
+    {
+        var loadContext = new StartupAssemblyLoadContext();
+        var assembly = loadContext.LoadFromAssemblyName(new AssemblyName("WoofWare.NUnitTestRunner.StartupHookLogic"));
+        assembly.DefinedTypes.First(x => x.Name == "StartupHookLogic").GetDeclaredMethod("DoIt")!.Invoke(null, null);
+    }
+}

WoofWare.NUnitTestRunner.StartupHook/WoofWare.NUnitTestRunner.StartupHook.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\WoofWare.NUnitTestRunner.StartupHookLogic\WoofWare.NUnitTestRunner.StartupHookLogic.csproj" />
+    <ProjectReference Include="..\WoofWare.NUnitTestRunner.Lib\WoofWare.NUnitTestRunner.Lib.fsproj"/>
+  </ItemGroup>
+
+  <ItemGroup>
+    <Compile Include="StartupHook.cs"/>
+  </ItemGroup>
+
+</Project>

WoofWare.NUnitTestRunner.StartupHookLogic/StartupHookLogic.cs

@@ -0,0 +1,102 @@
+using System.Reflection;
+using Microsoft.FSharp.Collections;
+using Microsoft.FSharp.Core;
+
+namespace WoofWare.NUnitTestRunner.StartupHookLogic;
+
+public class StartupHookLogic
+{
+    private static void DoIt()
+    {
+        // Load test runner lib
+        var nunitLib = Environment.GetEnvironmentVariable("WOOFWARE_NUNIT_LIB");
+        if (string.IsNullOrEmpty(nunitLib))
+        {
+            throw new ArgumentException("WoofWare.NUnitTestRunner hook expects to run with WOOFWARE_NUNIT_LIB set to WoofWare.NUnitTestRunner.Lib.dll");
+        }
+        Assembly.LoadFrom(nunitLib);
+
+        var startTime = DateTimeOffset.Now;
+
+        // Arg parsing
+
+        var filterVar = Environment.GetEnvironmentVariable("WOOFWARE_NUNIT_FILTER");
+        static bool NoFilter(TestFixture f, SingleTestMethod g)
+        {
+            return true;
+        }
+
+        FSharpFunc<TestFixture, FSharpFunc<SingleTestMethod, bool>> filter;
+        if (string.IsNullOrEmpty(filterVar))
+        {
+            filter = FuncConvert.FromFunc<TestFixture, SingleTestMethod, bool>(NoFilter);
+        }
+        else
+        {
+            filter = FilterModule.shouldRun(FilterModule.parse(filterVar));
+        }
+
+        var assy = Assembly.GetEntryAssembly()!;
+
+        var attrs = AssemblyLevelAttributesModule.get(assy);
+
+        FSharpOption<int> levelOfParallelism;
+        var parallelismVar = Environment.GetEnvironmentVariable("WOOFWARE_NUNIT_PARALLELISM_LEVEL");
+        if (string.IsNullOrEmpty(parallelismVar))
+        {
+            levelOfParallelism = attrs.Parallelism;
+        }
+        else
+        {
+            levelOfParallelism = FSharpOption<int>.Some(Int32.Parse(parallelismVar));
+        }
+
+        var testFixtures = assy.ExportedTypes.Select(TestFixtureModule.parse);
+        using var par =
+            new ParallelQueue(levelOfParallelism, attrs.Parallelizable, FSharpOption<CancellationToken>.None);
+        var creationTime = DateTimeOffset.Now;
+
+        var timeoutVar = Environment.GetEnvironmentVariable("WOOFWARE_NUNIT_TIMEOUT_SECS");
+        TimeSpan timeout;
+        if (string.IsNullOrEmpty(timeoutVar))
+        {
+            timeout = TimeSpan.FromHours(2.0);
+        }
+        else
+        {
+            timeout = TimeSpan.FromSeconds(Int32.Parse(timeoutVar));
+        }
+
+        var normalErr = Console.Error;
+        using var contexts = TestContexts.Empty();
+        Console.SetOut(contexts.Stdout);
+        Console.SetError(contexts.Stderr);
+        var results =
+            Task.WhenAll(testFixtures.Select(x =>
+                TestFixtureModule.run(contexts, par, TestProgress.toWriter(normalErr), filter, x)));
+
+        if (!results.Wait(timeout))
+        {
+            throw new Exception($"Tests failed to terminate within timeout of {timeout}");
+        }
+
+        var sorted =
+            results.Result.SelectMany(x => x);
+        var report = BuildTrxReport.build(assy, creationTime, startTime, ListModule.OfSeq(sorted));
+
+        var trxFile = Environment.GetEnvironmentVariable("WOOFWARE_NUNIT_GENERATE_TRX");
+        if (!string.IsNullOrEmpty(trxFile))
+        {
+            var contents = TrxReportModule.toXml(report).OuterXml;
+            var trxPath = new FileInfo(trxFile);
+            trxPath.Directory!.Create();
+            File.WriteAllText(trxPath.FullName, contents);
+            normalErr.WriteLine($"Written TRX file: {trxPath.FullName}");
+        }
+
+        if (report.ResultsSummary.Outcome.Equals(TrxOutcome.Completed))
+            Environment.Exit(0);
+        else
+            Environment.Exit(1);
+    }
+}

WoofWare.NUnitTestRunner.StartupHookLogic/WoofWare.NUnitTestRunner.StartupHookLogic.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\WoofWare.NUnitTestRunner.Lib\WoofWare.NUnitTestRunner.Lib.fsproj"/>
+  </ItemGroup>
+
+  <ItemGroup>
+    <Compile Include="StartupHookLogic.cs"/>
+  </ItemGroup>
+
+</Project>

WoofWare.NUnitTestRunner.sln

@@ -8,6 +8,10 @@ Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "WoofWare.NUnitTestRunner.Li
 EndProject
 Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "WoofWare.NUnitTestRunner.Test", "WoofWare.NUnitTestRunner\WoofWare.NUnitTestRunner.Test\WoofWare.NUnitTestRunner.Test.fsproj", "{443B01B3-2A8C-45CF-96D6-1D890EEA0533}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WoofWare.NUnitTestRunner.StartupHook", "WoofWare.NUnitTestRunner.StartupHook\WoofWare.NUnitTestRunner.StartupHook.csproj", "{E2C73D96-570C-4E3C-B997-707AF8BB0E6A}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WoofWare.NUnitTestRunner.StartupHookLogic", "WoofWare.NUnitTestRunner.StartupHookLogic\WoofWare.NUnitTestRunner.StartupHookLogic.csproj", "{A70627C8-9D19-42C2-AFEB-CFBDDDCE045D}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -30,5 +34,13 @@ Global
 		{443B01B3-2A8C-45CF-96D6-1D890EEA0533}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{443B01B3-2A8C-45CF-96D6-1D890EEA0533}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{443B01B3-2A8C-45CF-96D6-1D890EEA0533}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E2C73D96-570C-4E3C-B997-707AF8BB0E6A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E2C73D96-570C-4E3C-B997-707AF8BB0E6A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E2C73D96-570C-4E3C-B997-707AF8BB0E6A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E2C73D96-570C-4E3C-B997-707AF8BB0E6A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A70627C8-9D19-42C2-AFEB-CFBDDDCE045D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A70627C8-9D19-42C2-AFEB-CFBDDDCE045D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A70627C8-9D19-42C2-AFEB-CFBDDDCE045D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A70627C8-9D19-42C2-AFEB-CFBDDDCE045D}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal

WoofWare.NUnitTestRunner/Program.fs

@@ -1,113 +1,22 @@
 namespace WoofWare.NUnitTestRunner
 
 open System
+open System.Diagnostics
 open System.IO
+open System.Reflection
 open System.Threading.Tasks
 open Spectre.Console
 
-// Fix for https://github.com/Smaug123/unofficial-nunit-runner/issues/8
-// Set AppContext.BaseDirectory to where the test DLL is.
-// (This tells the DLL loader to look next to the test DLL for dependencies.)
-type SetBaseDir (testDll : FileInfo) =
-    let oldBaseDir = AppContext.BaseDirectory
-    do AppContext.SetData ("APP_CONTEXT_BASE_DIRECTORY", testDll.Directory.FullName)
-
-    interface IDisposable with
-        member _.Dispose () =
-            AppContext.SetData ("APP_CONTEXT_BASE_DIRECTORY", oldBaseDir)
-
-[<RequireQualifiedAccess>]
-type LogLevel =
-    | Nothing
-    | Verbose
-
-[<AutoOpen>]
-module Patterns =
-    let (|Key|_|) (start : string) (s : string) : string option =
-        if s.StartsWith (start + "=", StringComparison.Ordinal) then
-            s.Substring (start.Length + 1) |> Some
-        else
-            None
-
-type Args =
-    {
-        Dll : FileInfo
-        Trx : FileInfo option
-        Filter : Filter option
-        Logging : LogLevel
-        LevelOfParallelism : int option
-        Timeout : TimeSpan option
-    }
-
-    static member Parse (args : string list) : Args =
-        match args with
-        | [] -> failwith "The first arg must be a positional arg, the DLL to test."
-        | dll :: args ->
-
-        let rec go
-            (trx : FileInfo option)
-            (filter : Filter option)
-            (logging : LogLevel option)
-            (par : int option)
-            (timeout : TimeSpan option)
-            (args : string list)
-            =
-            match args with
-            | [] ->
-                {
-                    Dll = FileInfo dll
-                    Trx = trx
-                    Filter = filter
-                    Logging = logging |> Option.defaultValue LogLevel.Nothing
-                    LevelOfParallelism = par
-                    Timeout = timeout
-                }
-            | Key "--filter" filterStr :: rest
-            | "--filter" :: filterStr :: rest ->
-                match filter with
-                | Some _ -> failwith "Two conflicting filters; you can only specify --filter once"
-                | None -> go trx (Some (Filter.parse filterStr)) logging par timeout rest
-            | Key "--trx" trxStr :: rest
-            | "--trx" :: trxStr :: rest ->
-                match trx with
-                | Some _ -> failwith "Two conflicting TRX outputs; you can only specify --trx once"
-                | None -> go (Some (FileInfo trxStr)) filter logging par timeout rest
-            | Key "--verbose" verboseStr :: rest
-            | "--verbose" :: verboseStr :: rest ->
-                match logging with
-                | Some _ -> failwith "Two conflicting --verbose outputs; you can only specify --verbose once"
-                | None ->
-                    let verbose =
-                        if Boolean.Parse verboseStr then
-                            LogLevel.Verbose
-                        else
-                            LogLevel.Nothing
-
-                    go trx filter (Some verbose) par timeout rest
-            | Key "--parallelism" parStr :: rest
-            | "--parallelism" :: parStr :: rest ->
-                match par with
-                | Some _ -> failwith "Two conflicting --parallelism outputs; you can only specify --parallelism once"
-                | None -> go trx filter logging (Some (Int32.Parse parStr)) timeout rest
-            | Key "--timeout-seconds" timeoutStr :: rest
-            | "--timeout-seconds" :: timeoutStr :: rest ->
-                match timeout with
-                | Some _ ->
-                    failwith "Two conflicting --timeout-seconds outputs; you can only specify --timeout-seconds once"
-                | None -> go trx filter logging par (Some (TimeSpan.FromSeconds (Int32.Parse timeoutStr |> float))) rest
-            | k :: _rest -> failwith $"Unrecognised arg %s{k}"
-
-        go None None None None None args
-
 module Program =
-    let main argv =
+    // This is actually transcribed into C# in WoofWare.NUnitTestRunner.StartupHookLogic.
+    let execute argv =
         let startTime = DateTimeOffset.Now
 
         let args = argv |> List.ofArray |> Args.Parse
 
         let filter =
             match args.Filter with
-            | Some filter -> Filter.shouldRun filter
+            | Some (_, filter) -> Filter.shouldRun filter
             | None -> fun _ _ -> true
 
         let stderr =
@@ -125,54 +34,15 @@ module Program =
             for d in runtime do
                 stderr.WriteLine $".NET runtime directory: %s{d.FullName}"
 
-        use _ = new SetBaseDir (args.Dll)
-
         use contexts = TestContexts.Empty ()
 
         let ctx = LoadContext (args.Dll, runtime, contexts)
         let assy = ctx.LoadFromAssemblyPath args.Dll.FullName
 
-        let levelOfParallelism, par =
+        let attrs = AssemblyLevelAttributes.get assy
-            ((None, None), assy.CustomAttributes)
-            ||> Seq.fold (fun (levelPar, par) attr ->
-                match attr.AttributeType.FullName with
-                | "NUnit.Framework.LevelOfParallelismAttribute" ->
-                    let arg = attr.ConstructorArguments |> Seq.exactlyOne |> _.Value |> unbox<int>
-
-                    match levelPar with
-                    | None -> (Some arg, par)
-                    | Some existing ->
-                        failwith $"Assembly %s{assy.Location} declares parallelism %i{arg} and also %i{existing}"
-                | "NUnit.Framework.NonParallelizableAttribute" ->
-                    match levelPar with
-                    | None -> (Some 1, par)
-                    | Some existing ->
-                        failwith
-                            $"Assembly %s{assy.Location} declares non-parallelizable and also parallelism %i{existing}"
-                | "NUnit.Framework.ParallelizableAttribute" ->
-                    match par with
-                    | Some _ -> failwith "Got multiple Parallelize attributes in assembly"
-                    | None ->
-                        match attr.ConstructorArguments |> Seq.toList with
-                        | [] -> levelPar, Some (Parallelizable.Yes AssemblyParallelScope.Fixtures)
-                        | [ v ] ->
-                            match v.Value with
-                            | :? int as v ->
-                                match v with
-                                | 512 -> levelPar, Some (Parallelizable.Yes AssemblyParallelScope.Fixtures)
-                                | 256 -> levelPar, Some (Parallelizable.Yes AssemblyParallelScope.Children)
-                                | 257 ->
-                                    failwith "ParallelScope.All is invalid on assemblies; only Fixtures or Children"
-                                | 1 ->
-                                    failwith "ParallelScope.Self is invalid on assemblies; only Fixtures or Children"
-                                | v -> failwith $"Could not recognise value %i{v} of parallel scope on assembly"
-                            | v -> failwith $"Unexpectedly non-int value %O{v} of parallel scope on assembly"
-                        | _ -> failwith "unexpectedly got multiple args to Parallelizable on assembly"
-                | _ -> levelPar, par
-            )
 
         let levelOfParallelism =
-            match args.LevelOfParallelism, levelOfParallelism with
+            match args.LevelOfParallelism, attrs.Parallelism with
             | None, None -> None
             | Some taken, Some ignored ->
                 match args.Logging with
@@ -187,7 +57,7 @@ module Program =
 
         let testFixtures = assy.ExportedTypes |> Seq.map TestFixture.parse |> Seq.toList
 
-        use par = new ParallelQueue (levelOfParallelism, par)
+        use par = new ParallelQueue (levelOfParallelism, attrs.Parallelizable)
 
         let creationTime = DateTimeOffset.Now
 
@@ -206,233 +76,7 @@ module Program =
 
         let results = results.Result |> Seq.concat |> List.ofSeq
 
-        let finishTime = DateTimeOffset.Now
+        let report = BuildTrxReport.build assy creationTime startTime results
-        let finishTimeHumanReadable = finishTime.ToString @"yyyy-MM-dd HH:mm:ss"
-        let nowMachine = finishTime.ToString @"yyyy-MM-dd_HH_mm_ss"
-
-        let testListId = Guid.NewGuid ()
-
-        let testDefinitions, testEntries =
-            results
-            |> List.collect (fun results -> results.IndividualTestRunMetadata)
-            |> List.map (fun (data, _) ->
-                let defn =
-                    {
-                        Name = data.TestName
-                        Storage = assy.Location.ToLowerInvariant ()
-                        Id = data.TestId
-                        Execution =
-                            {
-                                Id = data.ExecutionId
-                            }
-                        TestMethod =
-                            {
-                                CodeBase = assy.Location
-                                AdapterTypeName = Uri "executor://woofware/"
-                                ClassName = data.ClassName
-                                Name = data.TestName
-                            }
-                    }
-
-                let entry : TrxTestEntry =
-                    {
-                        TestListId = testListId
-                        ExecutionId = data.ExecutionId
-                        TestId = data.TestId
-
-                    }
-
-                defn, entry
-            )
-            |> List.unzip
-
-        let hostname = Environment.MachineName
-
-        let settings =
-            {
-                Name = "default"
-                Id = Guid.NewGuid ()
-                Deployment =
-                    {
-                        RunDeploymentRoot = $"_%s{hostname}_%s{nowMachine}"
-                    }
-            }
-
-        let testList : TrxTestListEntry =
-            {
-                Id = testListId
-                Name = "All"
-            }
-
-        let counters =
-            (TrxCounters.Zero, results)
-            // TODO: this is woefully inefficient
-            ||> List.fold (fun counters results ->
-                let counters =
-                    (counters, results.Failed)
-                    ||> List.fold (fun counters (_, _) ->
-                        // TODO: the counters can be more specific about the failure mode
-                        counters.AddFailed ()
-                    )
-
-                let counters =
-                    (counters, results.OtherFailures)
-                    ||> List.fold (fun counters _ ->
-                        // TODO: the counters can be more specific about the failure mode
-                        counters.AddFailed ()
-                    )
-
-                (counters, results.Success)
-                ||> List.fold (fun counters (_, success, _) ->
-                    match success with
-                    | TestMemberSuccess.Ok -> counters.AddPassed ()
-                    | TestMemberSuccess.Ignored _
-                    | TestMemberSuccess.Explicit _ -> counters.AddNotExecuted ()
-                    | TestMemberSuccess.Inconclusive _ -> counters.AddInconclusive ()
-                )
-            )
-
-        // TODO: I'm sure we can do better than this; there's a whole range of possible
-        // states!
-        let outcome =
-            if counters.Failed > 0u then
-                TrxOutcome.Failed
-            else
-                TrxOutcome.Completed
-
-        let resultSummary : TrxResultsSummary =
-            {
-                Outcome = outcome
-                Counters = counters
-                Output =
-                    {
-                        StdOut = None
-                        StdErr = None
-                        ErrorInfo = None
-                    }
-                RunInfos =
-                    [
-                    // TODO: capture stdout
-                    ]
-            }
-
-        let times : TrxReportTimes =
-            {
-                Creation = creationTime
-                Queuing = startTime
-                Start = startTime
-                Finish = finishTime
-
-            }
-
-        let magicGuid = Guid.Parse "13cdc9d9-ddb5-4fa4-a97d-d965ccfc6d4b"
-
-        let results =
-            results
-            |> List.collect (fun results -> results.IndividualTestRunMetadata)
-            |> List.map (fun (i, cause) ->
-                let exc =
-                    match cause with
-                    | Choice2Of3 _ -> None
-                    | Choice1Of3 (TestMemberFailure.Malformed reasons) ->
-                        {
-                            StackTrace = None
-                            Message = reasons |> String.concat "\n" |> Some
-                        }
-                        |> Some
-                    | Choice1Of3 (TestMemberFailure.Failed fail)
-                    | Choice1Of3 (TestMemberFailure.Failed fail)
-                    | Choice1Of3 (TestMemberFailure.Failed fail) ->
-                        ((None, None), fail)
-                        ||> List.fold (fun (stackTrace, message) tf ->
-                            match tf with
-                            | TestFailure.TestFailed (UserMethodFailure.Threw (_, exc))
-                            | TestFailure.SetUpFailed (UserMethodFailure.Threw (_, exc))
-                            | TestFailure.TearDownFailed (UserMethodFailure.Threw (_, exc)) ->
-                                let stackTrace =
-                                    match stackTrace with
-                                    | None -> (exc : Exception).ToString ()
-                                    | Some s -> s
-
-                                (Some stackTrace, message)
-                            | TestFailure.TestFailed (UserMethodFailure.ReturnedNonUnit (_, ret))
-                            | TestFailure.SetUpFailed (UserMethodFailure.ReturnedNonUnit (_, ret))
-                            | TestFailure.TearDownFailed (UserMethodFailure.ReturnedNonUnit (_, ret)) ->
-                                let newMessage = $"returned non-unit value %O{ret}"
-
-                                let message =
-                                    match message with
-                                    | None -> newMessage
-                                    | Some message -> $"%s{message}\n%s{newMessage}"
-
-                                (stackTrace, Some message)
-                        )
-                        |> fun (stackTrace, message) ->
-                            {
-                                StackTrace = stackTrace
-                                Message = message
-                            }
-                            |> Some
-                    | Choice3Of3 (UserMethodFailure.Threw (_, exc)) ->
-                        {
-                            StackTrace = (exc : Exception).ToString () |> Some
-                            Message = None
-                        }
-                        |> Some
-                    | Choice3Of3 (UserMethodFailure.ReturnedNonUnit (_, ret)) ->
-                        {
-                            Message = $"returned non-unit value %O{ret}" |> Some
-                            StackTrace = None
-                        }
-                        |> Some
-
-                let outcome =
-                    match cause with
-                    | Choice1Of3 _ -> TrxTestOutcome.Failed
-                    | Choice2Of3 TestMemberSuccess.Ok -> TrxTestOutcome.Passed
-                    | Choice2Of3 (TestMemberSuccess.Inconclusive _) -> TrxTestOutcome.Inconclusive
-                    | Choice2Of3 (TestMemberSuccess.Ignored _)
-                    | Choice2Of3 (TestMemberSuccess.Explicit _) -> TrxTestOutcome.NotExecuted
-                    // TODO: we can totally do better here, more fine-grained classification
-                    | Choice3Of3 _ -> TrxTestOutcome.Failed
-
-                {
-                    ExecutionId = i.ExecutionId
-                    TestId = i.TestId
-                    TestName = i.TestName
-                    ComputerName = i.ComputerName
-                    Duration = i.End - i.Start
-                    StartTime = i.Start
-                    EndTime = i.End
-                    TestType = magicGuid
-                    Outcome = outcome
-                    TestListId = testListId
-                    RelativeResultsDirectory = i.ExecutionId.ToString () // for some reason
-                    Output =
-                        match i.StdOut, i.StdErr, exc with
-                        | None, None, None -> None
-                        | stdout, stderr, exc ->
-                            Some
-                                {
-                                    TrxOutput.StdOut = stdout
-                                    StdErr = stderr
-                                    ErrorInfo = exc
-                                }
-                }
-            )
-
-        let report : TrxReport =
-            {
-                Id = Guid.NewGuid ()
-                Name = $"@%s{hostname} %s{finishTimeHumanReadable}"
-                Times = times
-                Settings = settings
-                Results = results
-                TestDefinitions = testDefinitions
-                TestEntries = testEntries
-                TestLists = [ testList ]
-                ResultsSummary = resultSummary
-            }
 
         match args.Trx with
         | Some trxPath ->
@@ -442,10 +86,56 @@ module Program =
             Console.Error.WriteLine $"Written TRX file: %s{trxPath.FullName}"
         | None -> ()
 
-        match outcome with
+        match report.ResultsSummary.Outcome with
         | TrxOutcome.Completed -> 0
         | _ -> 1
 
+    let main argv =
+        let args = argv |> List.ofArray |> Args.Parse
+
+        let psi = ProcessStartInfo "dotnet"
+
+        match args.Trx with
+        | None -> ()
+        | Some trx -> psi.EnvironmentVariables.Add ("WOOFWARE_NUNIT_GENERATE_TRX", trx.FullName)
+
+        match args.LevelOfParallelism with
+        | None -> ()
+        | Some par -> psi.EnvironmentVariables.Add ("WOOFWARE_NUNIT_PARALLELISM_LEVEL", string<int> par)
+
+        match args.Filter with
+        | None -> ()
+        | Some (filter, _) -> psi.EnvironmentVariables.Add ("WOOFWARE_NUNIT_FILTER", filter)
+
+        match args.Timeout with
+        | None -> ()
+        | Some timeout ->
+            psi.EnvironmentVariables.Add ("WOOFWARE_NUNIT_TIMEOUT_SECS", string<int> (int<float> timeout.TotalSeconds))
+
+        psi.ArgumentList.Add "exec"
+        psi.ArgumentList.Add args.Dll.FullName
+
+        let us = Assembly.GetExecutingAssembly().Location |> FileInfo
+
+        let startupHook =
+            Path.Combine (us.Directory.FullName, "WoofWare.NUnitTestRunner.StartupHook.dll")
+
+        psi.EnvironmentVariables.Add ("DOTNET_STARTUP_HOOKS", startupHook)
+
+        psi.EnvironmentVariables.Add (
+            "WOOFWARE_NUNIT_LIB",
+            Path.Combine (us.Directory.FullName, "WoofWare.NUnitTestRunner.Lib.dll")
+        )
+
+        use proc = new Process ()
+        proc.StartInfo <- psi
+
+        if not (proc.Start ()) then
+            failwith "Failed to start dotnet"
+
+        proc.WaitForExit ()
+        proc.ExitCode
+
     [<EntryPoint>]
     let reallyMain argv =
         // Hack to make sure `finally`s get run.

WoofWare.NUnitTestRunner/Seq.fs

@@ -1,22 +0,0 @@
-namespace WoofWare.NUnitTestRunner
-
-[<RequireQualifiedAccess>]
-module internal Seq =
-
-    let tryMinBy (f : 'a -> 'b) (s : 'a seq) : 'a option =
-        use enum = s.GetEnumerator ()
-
-        if not (enum.MoveNext ()) then
-            None
-        else
-
-        let mutable answer = enum.Current
-        let mutable fAnswer = f enum.Current
-
-        while enum.MoveNext () do
-            let fNext = f enum.Current
-
-            if fNext < fAnswer then
-                answer <- enum.Current
-
-        Some answer

WoofWare.NUnitTestRunner/WoofWare.NUnitTestRunner.Test/WoofWare.NUnitTestRunner.Test.fsproj

@@ -16,7 +16,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="ApiSurface" Version="4.0.41" />
+        <PackageReference Include="ApiSurface" Version="4.0.42" />
         <PackageReference Include="FsCheck" Version="3.0.0-rc3" />
         <PackageReference Include="FsUnit" Version="6.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />

WoofWare.NUnitTestRunner/WoofWare.NUnitTestRunner.fsproj

@@ -2,7 +2,8 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
+    <RollForward>Major</RollForward>
     <PackAsTool>true</PackAsTool>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Authors>Patrick Stevens</Authors>
@@ -19,7 +20,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <Compile Include="Seq.fs" />
     <Compile Include="Progress.fs" />
     <Compile Include="Program.fs" />
     <None Include="..\README.md">
@@ -30,6 +30,8 @@
 
   <ItemGroup>
     <ProjectReference Include="..\WoofWare.NUnitTestRunner.Lib\WoofWare.NUnitTestRunner.Lib.fsproj" />
+    <ProjectReference Include="..\WoofWare.NUnitTestRunner.StartupHookLogic\WoofWare.NUnitTestRunner.StartupHookLogic.csproj" />
+    <ProjectReference Include="..\WoofWare.NUnitTestRunner.StartupHook\WoofWare.NUnitTestRunner.StartupHook.csproj" />
   </ItemGroup>
 
   <ItemGroup>

flake.nix

@@ -56,13 +56,20 @@
           doCheck = true;
         };
       };
-      devShell = pkgs.mkShell {
+      devShells = {
-        buildInputs = [dotnet-sdk];
+        default = pkgs.mkShell {
-        packages = [
+          packages = [
-          pkgs.alejandra
+            dotnet-sdk
-          pkgs.nodePackages.markdown-link-check
+            pkgs.alejandra
-          pkgs.shellcheck
+            pkgs.nodePackages.markdown-link-check
-        ];
+            pkgs.shellcheck
+          ];
+        };
+        net6 = pkgs.mkShell {
+          packages = [
+            pkgs.dotnetCorePackages.runtime_6_0
+          ];
+        };
       };
     });
 }

nix/deps.nix

@@ -3,8 +3,8 @@
 {fetchNuGet}: [
   (fetchNuGet {
     pname = "ApiSurface";
-    version = "4.0.41";
+    version = "4.0.42";
-    sha256 = "03kfa5ngmgkik9lc58sp8s9rrh9g40hhgjnrv662ks0d0y2i9i89";
+    sha256 = "0azjv64bbbhc4rndbjhcmqxxg1bkf1v3ym3x34zmsbz0lr1hy6pv";
   })
   (fetchNuGet {
     pname = "fantomas";
@@ -153,23 +153,23 @@
   })
   (fetchNuGet {
     pname = "NuGet.Common";
-    version = "6.10.0";
+    version = "6.10.1";
-    sha256 = "0nizrnilmlcqbm945293h8q3wfqfchb4xi8g50x4kjn0rbpd1kbh";
+    sha256 = "1z69k0j727jcwrxzmvnixdac84lb9706iabqs8mrns8j7kbmw1ns";
   })
   (fetchNuGet {
     pname = "NuGet.Configuration";
-    version = "6.10.0";
+    version = "6.10.1";
-    sha256 = "1aqaknaawnqx4mnvx9qw73wvj48jjzv0d78dzwl7m9zjlrl9myhz";
+    sha256 = "0qy2bdi3dz6fdw7qbv77fg956idm9d9733j8b1pcrcj9pfayys26";
   })
   (fetchNuGet {
     pname = "NuGet.Frameworks";
-    version = "6.10.0";
+    version = "6.10.1";
-    sha256 = "0hrd8y31zx9a0wps49czw0qgbrakb49zn3abfgylc9xrq990zkqk";
+    sha256 = "1p8d701fhbqv2r8vqmj948af9xvz2fd3273803cdrjy3a2wykmq1";
   })
   (fetchNuGet {
     pname = "NuGet.Packaging";
-    version = "6.10.0";
+    version = "6.10.1";
-    sha256 = "18s53cvrf51lihmaqqdf48p2qi6ky1l48jv0hvbp76cxwdg7rba4";
+    sha256 = "0zl8xfzvd1yij2ln6iwy6cz8qfwlbyyqlin872ab5y58ws61a2x2";
   })
   (fetchNuGet {
     pname = "NuGet.Protocol";
@@ -178,8 +178,8 @@
   })
   (fetchNuGet {
     pname = "NuGet.Versioning";
-    version = "6.10.0";
+    version = "6.10.1";
-    sha256 = "1x19njx4x0sw9fz8y5fibi15xfsrw5avir0cx0599yd7p3ykik5g";
+    sha256 = "0lji7g6abnpmhzlgvni8wlb7l62n4180v3sphp4494wi0gn7ds4c";
   })
   (fetchNuGet {
     pname = "NUnit";
@@ -253,8 +253,8 @@
   })
   (fetchNuGet {
     pname = "WoofWare.Myriad.Plugins";
-    version = "2.1.45";
+    version = "2.1.51";
-    sha256 = "1i9s9aq8dqnxyn01sa10dd24y9i7cgv2d0rshmrkvbvbjkcnz9vs";
+    sha256 = "1pdzdnjvq0a2gnbbz5gy9fzvxkyg6nl6x1k68xkm2a6gdkhkf68z";
   })
   (fetchNuGet {
     pname = "WoofWare.Myriad.Plugins.Attributes";
@@ -263,7 +263,7 @@
   })
   (fetchNuGet {
     pname = "WoofWare.PrattParser";
-    version = "0.2.1";
+    version = "0.2.2";
-    sha256 = "1cb9496fbbrdc40dirjmc7ax02ghr27ahqq5hpk96rdzyaang9hg";
+    sha256 = "0cgrmd1kc3k224lsjhy5npalwg6kpqd8nx78szi1yq67kyb0farq";
   })
 ]