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

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>