Use DOTNET_STARTUP_HOOK to have the target run the tests (#91)

Consumer/Consumer.fsproj

@@ -9,6 +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" />

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 ()