Issue389Tests.cs

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using System.Collections.Generic;
using System.Linq;
using Xunit;
using CommandLine.Text;
 
namespace CommandLine.Tests.Unit
{
    //Reference: PR# 392
    public class Issue389Tests
    {
 
        private const int ERROR_SUCCESS = 0;
 
        // Test method (xUnit) which fails
        [Fact]
        public void CallMain_GiveHelpArgument_ExpectSuccess()
        {
            var result = Program.__Main(new[] { "--help" });
 
            Assert.Equal(ERROR_SUCCESS, result);
        }
 
        // main program
        internal class Program
        {
 
 
            internal static int __Main(string[] args)
            {
                bool hasError = false;
                bool helpOrVersionRequested = false;
 
                ParserResult<Options> parsedOptions = Parser.Default.ParseArguments<Options>(args)
                    .WithNotParsed(errors => {
                        helpOrVersionRequested = errors.Any(
                            x => x.Tag == ErrorType.HelpRequestedError 
                                 || x.Tag == ErrorType.VersionRequestedError);
                        hasError = true;
                    });
 
                if(helpOrVersionRequested)
                {
                    return ERROR_SUCCESS;
                }
 
                // Execute as a normal call
                // ...
                return ERROR_SUCCESS;
            }
 
        }
 
        // Options
        internal class Options
        {
 
            [Option('c', "connectionString", Required = true, HelpText = "Texts.ExplainConnection")]
            public string ConnectionString { get; set; }
 
            [Option('j', "jobId", Required = true, HelpText = "Texts.ExplainJob")]
            public int JobId { get; set; }
 
            [Usage(ApplicationAlias = "Importer.exe")]
            public static IEnumerable<Example> Examples
            {
                get => new[] {
                    new Example("Texts.ExplainExampleExecution", new Options() {
                        ConnectionString="Server=MyServer;Database=MyDatabase",
                        JobId = 5
                    }),
                };
            }
 
        }
    }
}