spectre.console/test/Spectre.Console.Cli.Tests/Unit/CommandAppTests.Exceptions.cs

namespace Spectre.Console.Tests.Unit.Cli;

public sealed partial class CommandAppTests
{
    public sealed class Exception_Handling
    {
        [Fact]
        public void Should_Not_Propagate_Runtime_Exceptions_If_Not_Explicitly_Told_To_Do_So()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.AddBranch<AnimalSettings>("animal", animal =>
                {
                    animal.AddCommand<DogCommand>("dog");
                    animal.AddCommand<HorseCommand>("horse");
                });
            });

            // When
            var result = app.Run(new[] { "animal", "4", "dog", "101", "--name", "Rufus" });

            // Then
            result.ExitCode.ShouldBe(-1);
        }

        [Fact]
        public void Should_Not_Propagate_Exceptions_If_Not_Explicitly_Told_To_Do_So()
        {
            // Given
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.AddCommand<ThrowingCommand>("throw");
            });

            // When
            var result = app.Run(new[] { "throw" });

            // Then
            result.ExitCode.ShouldBe(-1);
        }

        [Fact]
        public void Should_Handle_Exceptions_If_ExceptionHandler_Is_Set_Using_Action()
        {
            // Given
            var exceptionHandled = false;
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.AddCommand<ThrowingCommand>("throw");
                config.SetExceptionHandler((_, _) =>
                {
                    exceptionHandled = true;
                });
            });

            // When
            var result = app.Run(new[] { "throw" });

            // Then
            result.ExitCode.ShouldBe(-1);
            exceptionHandled.ShouldBeTrue();
        }

        [Fact]
        public void Should_Handle_Exceptions_If_ExceptionHandler_Is_Set_Using_Function()
        {
            // Given
            var exceptionHandled = false;
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.AddCommand<ThrowingCommand>("throw");
                config.SetExceptionHandler((_, _) =>
                {
                    exceptionHandled = true;
                    return -99;
                });
            });

            // When
            var result = app.Run(new[] { "throw" });

            // Then
            result.ExitCode.ShouldBe(-99);
            exceptionHandled.ShouldBeTrue();
        }

        [Fact]
        public void Should_Have_Resolver_Set_When_Exception_Occurs_In_Command_Execution()
        {
            // Given
            ITypeResolver resolver = null;
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.AddCommand<ThrowingCommand>("throw");
                config.SetExceptionHandler((_, r) =>
                {
                    resolver = r;
                });
            });

            // When
            app.Run(new[] { "throw" });

            // Then
            resolver.ShouldNotBeNull();
        }

        [Fact]
        public void Should_Not_Have_Resolver_Set_When_Exception_Occurs_Before_Command_Execution()
        {
            // Given
            ITypeResolver resolver = null;
            var app = new CommandAppTester();
            app.Configure(config =>
            {
                config.AddCommand<DogCommand>("Лайка");
                config.SetExceptionHandler((_, r) =>
                {
                    resolver = r;
                });
            });

            // When
            app.Run(new[] { "throw", "on", "arg", "parsing" });

            // Then
            resolver.ShouldBeNull();
        }
    }
}