NixOS_WindowsWrapper/tests/NixWslWrapper.Tests/InfrastructureTests.cs

using System;
using System.IO;
using System.Text;
using NixWslWrapper.Infrastructure.IO;
using NixWslWrapper.Infrastructure.Executors;
using Xunit;

namespace NixWslWrapper.Tests
{
    public class InfrastructureTests
    {
        [Fact]
        public void ThreadedStreamCopier_ValidStream_ShouldCopyEntireContent()
        {
            var content = "Hello, Nix WSL Wrapper! Stream copying should work flawlessly.";
            byte[] bytes = Encoding.UTF8.GetBytes(content);
            using var input = new MemoryStream(bytes);
            using var output = new MemoryStream();

            var copier = new ThreadedStreamCopier(64); // small buffer to force multiple reads
            copier.Copy(input, output);

            byte[] resultBytes = output.ToArray();
            string result = Encoding.UTF8.GetString(resultBytes);

            Assert.Equal(content, result);
        }

        [Fact]
        public void ProcessBuilder_ValidConfiguration_ShouldBuildCorrectProcessStartInfo()
        {
            var builder = new ProcessBuilder()
                .SetFileName("my-app.exe")
                .SetArguments("--arg1 val1")
                .RedirectInput(true)
                .RedirectOutput(true)
                .RedirectError(true)
                .UseShellExecute(false)
                .CreateNoWindow(true);

            var startInfo = builder.Build();

            Assert.Equal("my-app.exe", startInfo.FileName);
            Assert.Equal("--arg1 val1", startInfo.Arguments);
            Assert.True(startInfo.RedirectStandardInput);
            Assert.True(startInfo.RedirectStandardOutput);
            Assert.True(startInfo.RedirectStandardError);
            Assert.False(startInfo.UseShellExecute);
            Assert.True(startInfo.CreateNoWindow);
        }
    }
}