Add project files.

.github/CODEOWNERS

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+*	amacocian@yahoo.com

.github/workflows/cd.yaml

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+name:  Plumsy CD Pipeline
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    environment: Default
+    strategy:
+      matrix:
+        targetplatform: [x64]
+
+    runs-on: windows-latest
+
+    env:
+      Configuration: Release
+      Solution_Path: Plumsy.sln
+      Test_Project_Path: Plumsy.Tests\Plumsy.Tests.csproj
+      Source_Project_Path: Plumsy\Plumsy.csproj
+      Actions_Allow_Unsecure_Commands: true
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Install .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: '7.x'
+
+    - name: Setup MSBuild.exe
+      uses: microsoft/setup-msbuild@v1.0.1
+
+    - name: Restore project
+      run: msbuild $env:Solution_Path /t:Restore /p:Configuration=$env:Configuration /p:RuntimeIdentifier=$env:RuntimeIdentifier
+      env:
+        RuntimeIdentifier: win-${{ matrix.targetplatform }}
+
+    - name: Build Plumsy project
+      run: dotnet build Plumsy -c $env:Configuration
+
+    - name: Package Plumsy
+      run: dotnet pack -c Release -o . $env:Source_Project_Path
+
+    - name: Publish
+      run: dotnet nuget push *.nupkg --api-key ${{ secrets.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json --skip-duplicate

.github/workflows/ci.yaml

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+name:  Plumsy CI Pipeline
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        targetplatform: [x64]
+
+    runs-on: windows-latest
+
+    env:
+      Solution_Path: Plumsy.sln
+      Test_Project_Path: Plumsy.Tests\Plumsy.Tests.csproj
+      Test_Plugin_Project_Path: Plumsy.Tests.SimplePlugin\Plumsy.Tests.SimplePlugin.csproj
+      Source_Project_Path: Plumsy\Plumsy.csproj
+      Actions_Allow_Unsecure_Commands: true
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Install .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: '6.x'
+
+    - name: Setup MSBuild.exe
+      uses: microsoft/setup-msbuild@v1.0.1
+
+    - name: Build SimplePlugin project
+      run: dotnet build $env:Test_Plugin_Project_Path
+
+    - name: Prepare plugin files # Needs to be done manually in this pipeline
+      run: |
+        mkdir ${{ github.workspace }}\SimplePlugin
+        cp ${{ github.workspace }}\Plumsy.Tests.SimplePlugin\bin\Debug\net6.0\Plumsy.Tests.SimplePlugin.dll ${{ github.workspace }}\SimplePlugin\Plumsy.Tests.SimplePlugin.dll
+        cp ${{ github.workspace }}\Plumsy.Tests.SimplePlugin\bin\Debug\net6.0\SystemExtensions.NetStandard.dll ${{ github.workspace }}\SimplePlugin\SystemExtensions.NetStandard.dll
+
+    - name: Echo solution path
+      run: echo /p:SolutionDir=${{ github.workspace }}\
+
+    - name: Execute Plumsy Unit Tests
+      run: dotnet test $env:Test_Project_Path /p:SolutionDir=${{ github.workspace }}\ --logger:"console;verbosity=normal" # Need to manually set the SolutionDir, otherwise it's unspecified
+
+    - name: Restore Project
+      run: msbuild $env:Solution_Path /t:Restore /p:Configuration=$env:Configuration /p:RuntimeIdentifier=$env:RuntimeIdentifier
+      env:
+        Configuration: Debug
+        RuntimeIdentifier: win-${{ matrix.targetplatform }}

LICENSE

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+MIT License
+
+Copyright (c) 2023 Macocian Alexandru Victor
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Plumsy.Tests.SimplePlugin/Main.cs

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+using System.Extensions;
+
+namespace Plum.Net.Tests.SimplePlugin;
+
+public sealed class Main
+{
+    public Main()
+    {
+        this.ThrowIfNull("this");
+    }
+
+    public bool ReturnTrue() => true;
+}

Plumsy.Tests.SimplePlugin/Plumsy.Tests.SimplePlugin.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
+  </PropertyGroup>
+
+  <PropertyGroup>
+	<DestinationFolder>$(SolutionDir)SimplePlugin</DestinationFolder>
+  </PropertyGroup>
+
+  <Target Name="CopyAssembliesToSolution" AfterTargets="PostBuildEvent">
+	<Copy SourceFiles="$(OutputPath)$(AssemblyName).dll" DestinationFolder="$(DestinationFolder)" />
+    <Copy SourceFiles="$(OutputPath)SystemExtensions.NetStandard.dll" DestinationFolder="$(DestinationFolder)" />
+  </Target>
+
+  <ItemGroup>
+    <PackageReference Include="SystemExtensions.NetStandard" Version="1.6.2" />
+  </ItemGroup>
+</Project>

Plumsy.Tests/PluginManagerTests.cs

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+using FluentAssertions;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NSubstitute;
+using Plum.Net.Models;
+using Plum.Net.Tests.Resolvers;
+using Plum.Net.Tests.SimplePlugin;
+using Plum.Net.Validators;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Reflection.Metadata;
+using System.Runtime.Loader;
+
+namespace Plum.Net.Tests;
+
+[TestClass]
+public class PluginManagerTests
+{
+    private readonly string pluginDirectory;
+    private readonly PluginManager pluginManager;
+
+    public PluginManagerTests()
+    {
+        this.pluginDirectory = Path.Combine(Environment.CurrentDirectory, "Plugins");
+        this.pluginManager = new(this.pluginDirectory);
+        this.pluginManager.WithDependencyResolver(new SimpleDependencyResolver());
+    }
+
+    [TestInitialize]
+    public void TestInitialize()
+    {
+        var assemblyLoadEventHandlerField = typeof(AssemblyLoadContext).GetFields(BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic).First(f => f.Name == "AssemblyLoad");
+        assemblyLoadEventHandlerField.SetValue(AssemblyLoadContext.Default, null);
+
+        var resolveDependencyEventHandlerField = typeof(AssemblyLoadContext).GetFields(BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic).First(f => f.Name == "AssemblyResolve");
+        resolveDependencyEventHandlerField.SetValue(AssemblyLoadContext.Default, null);
+    }
+
+    [TestMethod]
+    public void PluginManager_MissingPluginDirectory_ShouldReturnNoPlugins()
+    {
+        var pluginManager = new PluginManager(Path.Combine(this.pluginDirectory, Guid.NewGuid().ToString()));
+
+        var plugins = pluginManager.GetAvailablePlugins();
+
+        plugins.Should().HaveCount(0);
+    }
+
+    [TestMethod]
+    public void PluginManager_ExistingPlugin_ShouldReturnExpectedPlugin()
+    {
+        var plugins = this.pluginManager.GetAvailablePlugins();
+
+        plugins.Should().HaveCount(1);
+        plugins.First().Name.Should().Be("Plum.Net.Tests.SimplePlugin");
+    }
+
+    [TestMethod]
+    public void PluginManager_VersionValidator_ValidatesVersion()
+    {
+        var called = false;
+        var validator = Substitute.For<IEnvironmentVersionValidator>();
+        this.pluginManager.WithEnvironmentVersionValidator(validator);
+        validator.Validate(Arg.Any<Version>(), Arg.Any<Version>()).Returns(callinfo =>
+        {
+            called = true;
+            return true;
+        });
+
+        var plugins = this.pluginManager.GetAvailablePlugins().ToList();
+
+        called.Should().BeTrue();
+    }
+
+    [TestMethod]
+    public void PluginManager_VersionValidator_CurrentVersionMatchesEnvironment()
+    {
+        var validator = Substitute.For<IEnvironmentVersionValidator>();
+        this.pluginManager.WithEnvironmentVersionValidator(validator);
+        validator.Validate(Arg.Any<Version>(), Arg.Any<Version>()).Returns(callinfo =>
+        {
+            var currentVersion = callinfo.ArgAt<Version>(0);
+            currentVersion.Should().Be(Environment.Version);
+
+            return true;
+        });
+
+        var plugins = this.pluginManager.GetAvailablePlugins().ToList();
+    }
+
+    [TestMethod]
+    public void PluginManager_VersionValidatorDenies_ReturnsNoPlugins()
+    {
+        var validator = Substitute.For<IEnvironmentVersionValidator>();
+        this.pluginManager.WithEnvironmentVersionValidator(validator);
+        validator.Validate(Arg.Any<Version>(), Arg.Any<Version>()).Returns(callinfo =>
+        {
+            return false;
+        });
+
+        var plugins = this.pluginManager.GetAvailablePlugins().ToList();
+
+        plugins.Should().HaveCount(0);
+    }
+
+    [TestMethod]
+    public void PluginManager_TypeDefinitionsValidator_CallsValidator()
+    {
+        var called = false;
+        var validator = Substitute.For<ITypeDefinitionsValidator>();
+        this.pluginManager.WithTypeDefinitionsValidator(validator);
+        validator.Validate(Arg.Any<IEnumerable<TypeDefinition>>(), Arg.Any<MetadataReader>()).Returns(callinfo =>
+        {
+            called = true;
+            return true;
+        });
+
+        var plugins = this.pluginManager.GetAvailablePlugins().ToList();
+        called.Should().BeTrue();
+    }
+
+    [TestMethod]
+    public void PluginManager_TypeDefinitionsValidator_ReceivesMainType()
+    {
+        var validator = Substitute.For<ITypeDefinitionsValidator>();
+        this.pluginManager.WithTypeDefinitionsValidator(validator);
+        validator.Validate(Arg.Any<IEnumerable<TypeDefinition>>(), Arg.Any<MetadataReader>()).Returns(callinfo =>
+        {
+            var typeDefinitions = callinfo.ArgAt<IEnumerable<TypeDefinition>>(0);
+            var metadataReader = callinfo.ArgAt<MetadataReader>(1);
+            typeDefinitions.Select(t => metadataReader.GetString(t.Name)).Any(t => t == "Main").Should().BeTrue();
+            return true;
+        });
+
+        var plugins = this.pluginManager.GetAvailablePlugins().ToList();
+    }
+
+    [TestMethod]
+    public void PluginManager_MetadataValidator_CallsValidator()
+    {
+        var called = false;
+        var validator = Substitute.For<IMetadataValidator>();
+        this.pluginManager.WithMetadataValidator(validator);
+        validator.Validate(Arg.Any<MetadataReader>()).Returns(callinfo =>
+        {
+            var metadataReader = callinfo.ArgAt<MetadataReader>(0);
+            metadataReader.Should().NotBeNull();
+            called = true;
+            return true;
+        });
+
+        var plugins = this.pluginManager.GetAvailablePlugins().ToList();
+        called.Should().BeTrue();
+    }
+
+    [TestMethod]
+    public void PluginManager_LoadPlugins_ShouldSucceed()
+    {
+        var plugins = this.pluginManager.GetAvailablePlugins();
+
+        var results = this.pluginManager.LoadPlugins(plugins);
+
+        results.Should().HaveCount(1);
+        results.First().Should().BeOfType<PluginLoadOperation.Success>();
+    }
+
+    [TestMethod]
+    public void PluginManager_LoadPlugins_ReturnsExpectedAssembly()
+    {
+        this.pluginManager.WithForceLoadDependencies(true);
+        var plugins = this.pluginManager.GetAvailablePlugins();
+
+        var results = this.pluginManager.LoadPlugins(plugins);
+        var assembly = results.OfType<PluginLoadOperation.Success>().First().Plugin.Assembly;
+        var mainType = assembly.GetTypes().First(t => t.Name == nameof(Main));
+        var main = Activator.CreateInstance(mainType).As<Main>();
+
+        main.Should().NotBeNull();
+        main.ReturnTrue().Should().BeTrue();
+    }
+
+    [TestMethod]
+    [Ignore("This test fails when run together with the other tests, as the dependent assembly is loaded into the AppDomain by other tests")]
+    public void PluginManager_LoadPlugins_WithNoResolver_FailsToResolveAssembly()
+    {
+        var pluginManager = new PluginManager(this.pluginDirectory);
+        pluginManager.WithForceLoadDependencies(true);
+        var plugins = pluginManager.GetAvailablePlugins();
+
+        var results = pluginManager.LoadPlugins(plugins);
+
+        results.First().Should().BeOfType<PluginLoadOperation.ExceptionEncountered>();
+    }
+
+    [TestMethod]
+    public void PluginManager_LoadPlugins_WithNoResolverAndNoForcedDependencyResolve_Succeeds()
+    {
+        var pluginManager = new PluginManager(this.pluginDirectory);
+        pluginManager.WithForceLoadDependencies(false);
+        var plugins = pluginManager.GetAvailablePlugins();
+
+        var results = pluginManager.LoadPlugins(plugins);
+
+        results.First().Should().BeOfType<PluginLoadOperation.Success>();
+    }
+}