fengling-gateway/tests/YarpGateway.Tests/Unit/Plugins/PluginLoadContextTests.cs

using System.Reflection;
using Xunit;
using YarpGateway.Plugins;

namespace YarpGateway.Tests.Unit.Plugins;

public class PluginLoadContextTests
{
    private const string SharedAssemblyName = "Fengling.Gateway.Plugin.Abstractions";

    [Fact]
    public void Constructor_ShouldInitializeWithPluginPath()
    {
        // Arrange
        var pluginPath = Path.Combine(Path.GetTempPath(), "test-plugin");

        // Act
        var context = new PluginLoadContext(pluginPath);

        // Assert
        Assert.NotNull(context);
    }

    [Fact]
    public void LoadAssembly_SharedAssembly_ShouldReturnNull_UseDefaultALC()
    {
        // Arrange
        var pluginPath = Path.Combine(Path.GetTempPath(), "test-plugin");
        var context = new PluginLoadContext(pluginPath);
        var assemblyName = new AssemblyName(SharedAssemblyName);

        // Act
        var assembly = context.LoadAssembly(assemblyName);

        // Assert - null means use default ALC
        Assert.Null(assembly);
    }

    [Fact]
    public void LoadAssembly_UnknownAssembly_ShouldReturnNull()
    {
        // Arrange
        var pluginPath = Path.Combine(Path.GetTempPath(), "test-plugin");
        var context = new PluginLoadContext(pluginPath);
        var assemblyName = new AssemblyName("NonExistentAssembly");

        // Act
        var assembly = context.LoadAssembly(assemblyName);

        // Assert
        Assert.Null(assembly);
    }

    [Fact]
    public void IsCollectible_ShouldBeTrue()
    {
        // Arrange
        var pluginPath = Path.Combine(Path.GetTempPath(), "test-plugin");
        var context = new PluginLoadContext(pluginPath);

        // Assert
        Assert.True(context.IsCollectible);
    }
}