Test Environment.Exit () in C #

Question

Is there any equivalent ExpectedSystemExitin C # in Java? I have a way out in my code, and I would really like to test it. The only thing I found in C # is not a very good workaround .

Code example

public void CheckRights()
{
    if(!service.UserHasRights())
    {
         Environment.Exit(1);
    }
}

Test code

[TestMethod]
public void TestCheckRightsWithoutRights()
{
    MyService service = ...
    service.UserHasRights().Returns(false);

    ???
}

I use the VS framework for testing (+ NSubstitute for bullying), but no problem switching to nunit or something else for this test.

Answer 1

I ended up creating a new method, which I can then tempt in my tests.

the code

public void CheckRights()
{
    if(!service.UserHasRights())
    {
         Environment.Exit(1);
    }
}

internal virtual void Exit() 
{
    Environment.Exit(1);
}

Unit test

[TestMethod]
public void TestCheckRightsWithoutRights()
{
    MyService service = ...
    service.When(svc => svc.Exit()).DoNotCallBase();
    ...
    service.CheckRights();
    service.Received(1).Exit();
}

Answer 2

, .

:

public interface IEnvironment
{
    void Exit(int code);
}

, UserHasRights():

public interface IRightsService
{
    bool UserHasRights();
}

, , , :

public sealed class RightsChecker
{
    readonly IRightsService service;
    readonly IEnvironment environment;

    public RightsChecker(IRightsService service, IEnvironment environment)
    {
        this.service     = service;
        this.environment = environment;
    }

    public void CheckRights()
    {
        if (!service.UserHasRights())
        {
            environment.Exit(1);
        }
    }
}

, , IEnvironment.Exit() . , Moq, :

[TestMethod]
public static void CheckRights_exits_program_when_user_has_no_rights()
{
    var rightsService = new Mock<IRightsService>();
    rightsService.Setup(foo => foo.UserHasRights()).Returns(false);

    var enviromnent = new Mock<IEnvironment>();

    var rightsChecker = new RightsChecker(rightsService.Object, enviromnent.Object);

    rightsChecker.CheckRights();

    enviromnent.Verify(foo => foo.Exit(1));
}

---

, Environment.Exit(), , , . (: - DateTime.Now.)

, " " - , , unit test. , .

, Environment :

public abstract class EnvironmentControl
{
    public static EnvironmentControl Current
    {
        get
        {
            return _current;
        }

        set
        {
            if (value == null)
                throw new ArgumentNullException(nameof(value));

            _current = value;
        }
    }

    public abstract void Exit(int value);

    public static void ResetToDefault()
    {
        _current = DefaultEnvironmentControl.Instance;
    }

    static EnvironmentControl _current = DefaultEnvironmentControl.Instance;
}

public class DefaultEnvironmentControl : EnvironmentControl
{
    public override void Exit(int value)
    {
        Environment.Exit(value);
    }

    public static DefaultEnvironmentControl Instance => _instance.Value;

    static readonly Lazy<DefaultEnvironmentControl> _instance = new Lazy<DefaultEnvironmentControl>(() => new DefaultEnvironmentControl());
}

EnvironmentControl.Current.Exit(). IEnvironment RightsChecker:

public sealed class RightsChecker
{
    readonly IRightsService service;

    public RightsChecker(IRightsService service)
    {
        this.service = service;
    }

    public void CheckRights()
    {
        if (!service.UserHasRights())
        {
            EnvironmentControl.Current.Exit(1);
        }
    }
}

- , :

public static void CheckRights_exits_program_when_user_has_no_rights()
{
    var rightsService = new Mock<IRightsService>();
    rightsService.Setup(foo => foo.UserHasRights()).Returns(false);

    var enviromnent = new Mock<EnvironmentControl>();
    EnvironmentControl.Current = enviromnent.Object;

    try
    {
        var rightsChecker = new RightsChecker(rightsService.Object);
        rightsChecker.CheckRights();
        enviromnent.Verify(foo => foo.Exit(1));
    }

    finally
    {
        EnvironmentControl.ResetToDefault();
    }
}

. .

Answer 3

, / , . Exit ?

class RightsChecker
{
    public Action AccessDeniedAction { get; set; }

    public RightsChecker(...)
    {
        ...
        AccessDeniedAction = () => Environment.Exit();
    }
}

[Test]
public TestCheckRightsWithoutRights()
{
    ...
    bool wasAccessDeniedActionExecuted = false;
    rightsChecker.AccessDeniedAction = () => { wasAccessDeniedActionExecuted = true; }
    ...
    Assert.That(wasAccessDeniedActionExecuted , Is.True);
}