NixOS_WindowsWrapper/tests/NixWslWrapper.Tests/CliTests.cs

using System;
using Moq;
using NixWslWrapper.Cli;
using NixWslWrapper.Core.Domain;
using NixWslWrapper.Core.Interfaces;
using Xunit;

namespace NixWslWrapper.Tests
{
    public class CliTests
    {
        [Fact]
        public void CliController_ForwardArguments_ShouldReturnExecutorExitCode()
        {
            var mockExecutor = new Mock<ICommandExecutor>();
            var mockVerifier = new Mock<IPrerequisiteVerifier>();
            var expectedResult = new ExecutionResult(42);
            mockExecutor
                .Setup(m => m.Execute(It.IsAny<NixArguments>(), It.IsAny<WslTarget>()))
                .Returns(expectedResult);

            var controller = new CliController(mockExecutor.Object, mockVerifier.Object);
            string[] cliArgs = new[] { "run", "nixpkgs#hello" };
            
            int exitCode = controller.Run(cliArgs);

            Assert.Equal(42, exitCode);
            mockExecutor.Verify(m => m.Execute(
                It.Is<NixArguments>(a => a.RawArguments.Length == 2 && a.RawArguments[0] == "run"),
                It.IsAny<WslTarget>()
            ), Times.Once);
        }

        [Fact]
        public void CliController_HelpMenuFlag_ShouldReturnZeroImmediately()
        {
            var mockExecutor = new Mock<ICommandExecutor>();
            var mockVerifier = new Mock<IPrerequisiteVerifier>();
            var controller = new CliController(mockExecutor.Object, mockVerifier.Object);
            string[] cliArgs = new[] { "--wsl-help" };

            int exitCode = controller.Run(cliArgs);

            Assert.Equal(0, exitCode);
            mockExecutor.Verify(m => m.Execute(It.IsAny<NixArguments>(), It.IsAny<WslTarget>()), Times.Never);
        }
    }
}