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Mock IOptionsMonitor

How can I make an class instance manually of a class that requires an IOptionsMonitor in the constructor?
My Class
private readonly AuthenticationSettings _authenticationSettings;
public ActiveDirectoryLogic(IOptionsMonitor<AuthenticationSettings> authenticationSettings)
{
_authenticationSettings = authenticationSettings.CurrentValue;
}
My test
AuthenticationSettings au = new AuthenticationSettings(){ ... };
var someOptions = Options.Create(new AuthenticationSettings());
var optionMan = new OptionsMonitor(someOptions); // dont work.
ActiveDirectoryLogic _SUT = new ActiveDirectoryLogic(au);
I tried to make an IOptionsMonitor object manually but can't figure out how.

You are calling the constructor of the OptionsMonitor<TOptions> class incorrectly.
In this case I would have just mocked the IOptionsMonitor<AuthenticationSettings> interface
For example using Moq
AuthenticationSettings au = new AuthenticationSettings() { ... };
var monitor = Mock.Of<IOptionsMonitor<AuthenticationSettings>>(_ => _.CurrentValue == au);
ActiveDirectoryLogic _SUT = new ActiveDirectoryLogic(monitor);

Here is another way to do it that doesn't involve trying to set the readonly CurrentValue field.
using Moq;
private IOptionsMonitor<AppConfig> GetOptionsMonitor(AppConfig appConfig)
{
var optionsMonitorMock = new Mock<IOptionsMonitor<AppConfig>>();
optionsMonitorMock.Setup(o => o.CurrentValue).Returns(appConfig);
return optionsMonitorMock.Object;
}

Achieving the same in NSubstitute:
var optionsMonitorMock = Substitute.For<IOptionsMonitor<AuthenticationSettings>>();
optionsMonitorMock.CurrentValue.Returns(new AuthenticationSettings
{
// values go here
});

How to mock nested properties and objects and their functions?

I have the code below which I would like to test, but I'm not sure whether it is possible or not.
I have EF repositories and they are put together to a class as public properties. I don't know exactly whether it is bad solution or not, but it is easier to manage the code and its dependencies. Only the testability is still a question.
Purpose of my test is injecting data via
administrationRepository.ModuleScreen.GetAll()
method and catch the result. I know that it can be tested once it is deployed, but I want the tests in build time in order to have as fast feedback as possible.
I went through questions and answers here, but I cannot find answers. In my code I got to the point where the property is set up, but when I call the administrationRepoMock.Object.ModuleScreen.GetAll() ReSharper offers only the methods coming from Entitiy Framework and not the Moq related functions.
It is possible what I want? If so, how? Is my design suitable for this? If not can you give me articles, urls where I can see examples?
Repository:
public interface IModuleScreen
{
IEnumerable<DomainModel.Administration.ModuleScreen> GetAll();
}
public interface IAdministrationRepository
{
IModuleScreen ModuleScreen { get; }
}
public partial class AdministrationRepository : IAdministrationRepository
{
public virtual IModuleScreen ModuleScreen { get; private set; }
public AdministrationRepository( IModuleScreen moduleScreen )
{
this.ModuleScreen = moduleScreen;
}
}
Application:
public partial class DigitalLibraryApplication : IDigitalLibraryApplication
{
private IAdministrationRepository _administrationRepository;
private IMapper.IMapper.IMapper _mapper;
private IDiLibApplicationHelper _dilibApplicationHelper;
#region Ctor
public DigitalLibraryApplication( IAdministrationRepository administrationRepository, IMapper.IMapper.IMapper mapper, IDiLibApplicationHelper diLibApplicationHelper)
{
_administrationRepository = administrationRepository;
_mapper = mapper;
_dilibApplicationHelper = diLibApplicationHelper;
}
#endregion
public IEnumerable<ModuleScreenContract> GetModuleScreens()
{
//inject data here
IEnumerable<ModuleScreen> result = _administrationRepository.ModuleScreen.GetAll();
List<ModuleScreenContract> mappedResult = _mapper.MapModuleScreenToModuleScreenContracts(result);
return mappedResult;
}
}
Test code:
[Test]
public void ItCalls_ModuleRepository_Get_Method()
{
List<SayusiAndo.DiLib.DomainModel.Administration.ModuleScreen> queryResult = new List<SayusiAndo.DiLib.DomainModel.Administration.ModuleScreen>()
{
new DomainModel.Administration.ModuleScreen()
{
Id = 100,
},
};
var moduleScreenMock = new Mock<IModuleScreen>();
moduleScreenMock.Setup(c => c.GetAll()).Returns(queryResult);
administrationRepoMock.SetupProperty(c => c.ModuleScreen, moduleScreenMock.Object);
var mapperMock = new Mock<IMapper.IMapper.IMapper>();
var dilibApplicationHerlperMock = new Mock<IDiLibApplicationHelper>();
IDigitalLibraryApplication app = new DigitalLibraryApplication( administrationRepoMock.Object, mapperMock.Object, dilibApplicationHerlperMock.Object );
app.GetModules();
//issue is here
administrationRepoMock.Object.ModuleScreen.GetAll() //???
}

Here is a refactoring of your test that passes when run. You can update the pass criteria to suit you definition of a successful test.
[Test]
public void ItCalls_ModuleRepository_Get_Method() {
// Arrange
List<ModuleScreen> queryResult = new List<ModuleScreen>()
{
new ModuleScreen()
{
Id = 100,
},
};
//Building mapped result from query to compare results later
List<ModuleScreenContract> expectedMappedResult = queryResult
.Select(m => new ModuleScreenContract { Id = m.Id })
.ToList();
var moduleScreenMock = new Mock<IModuleScreen>();
moduleScreenMock
.Setup(c => c.GetAll())
.Returns(queryResult)
.Verifiable();
var administrationRepoMock = new Mock<IAdministrationRepository>();
administrationRepoMock
.Setup(c => c.ModuleScreen)
.Returns(moduleScreenMock.Object)
.Verifiable();
var mapperMock = new Mock<IMapper>();
mapperMock.Setup(c => c.MapModuleScreenToModuleScreenContracts(queryResult))
.Returns(expectedMappedResult)
.Verifiable();
//NOTE: Not seeing this guy doing anything. What's its purpose
var dilibApplicationHerlperMock = new Mock<IDiLibApplicationHelper>();
IDigitalLibraryApplication app = new DigitalLibraryApplication(administrationRepoMock.Object, mapperMock.Object, dilibApplicationHerlperMock.Object);
//Act (Call the method under test)
var actualMappedResult = app.GetModuleScreens();
//Assert
//Verify that configured methods were actually called. If not, test will fail.
moduleScreenMock.Verify();
mapperMock.Verify();
administrationRepoMock.Verify();
//there should actually be a result.
Assert.IsNotNull(actualMappedResult);
//with items
CollectionAssert.AllItemsAreNotNull(actualMappedResult.ToList());
//There lengths should be equal
Assert.AreEqual(queryResult.Count, actualMappedResult.Count());
//And there should be a mapped object with the same id (Assumption)
var expected = queryResult.First().Id;
var actual = actualMappedResult.First().Id;
Assert.AreEqual(expected, actual);
}

Unit test won't "cover" simple get method. (c#)

I have a simple "Get" method. Ex:
public class Foo : IFoo
{
public Dictionary<string,string> GetSomething(string xyz)
{
var result = new Dictionary<string,string>
... Go to DB and return some key value pairs
return result;
}
}
I wrote a simple test that execute and passes successfully but I'm not getting code coverage on the method.
[TestMethod()]
public void GetSomething()
{
var target = new StubIFoo();
var expected = new Dictionary<string, string>
{
{"blahKey","blahValue"}
};
var results = target.GetSomethingString = s =>
{
var result = new Dictionary<string, string> {{"a", "b"}};
return result;
};
var actual = results("a");
CollectionAssert.AreEqual(expected,actual);
}
I also tried to target the class itself, which provides the coverage but doesn't return any results (ex: "var target = new StubFoo();")
Again, it successfully executes and passes but I'm not getting any coverage. Any pointers would be appreciated. Thanks.

Foo.GetSomething() has 0 code coverage, because you never call it in your test.
Instead, you call StubIFoo.GetSomething().
Change var target = new StubIFoo(); into var target = new Foo();, remove the code initializing StubIFoo and you will get some coverage.
Stubs are there to prevent you from using (and testing) the real class. But you must not use a stub of the class you are testing !

In your test you are not calling the method GetSomething, but instead are setting a value to the property GetSomethingString.
// Here is the problem. This:
var results = target.GetSomethingString = s =>
{
var result = new Dictionary<string, string> {{"a", "b"}};
return result;
};
// Is equal to this:
var lambda = s =>
{
var result = new Dictionary<string, string> {{"a", "b"}};
return result;
};
var results2 = target.GetSomethingString = lambda;

Here is general idea what you should do
public class Foo : IFoo
{
IDbAccess db;
// Pass the interface, do pass parameters to create it inside constructor
public Foo(IDbAccess db)
{
this.db = db;
}
public Dictionary<string,string> GetSomething(string xyz)
{
var result = new Dictionary<string,string>
// ... Go to DB and return some key value pairs
result.Add(db.MethodWhatever(xyz));
return result;
}
}
[TestMethod()]
public void GetSomething()
{
var dbMock = new DatabaseMock(); // This implements IDbAccess
var target = new Foo(dbMock);
var expected = new Dictionary<string, string>
{
{"blahKey","blahValue"}
};
// get something
var results = target.GetSomething("xyzstring");
// verify results
var actual = results.whatever;
CollectionAssert.AreEqual(expected,actual);
}

RhinoMock Stub Linq Where clause for DbContext

I was trying to unit test my repository. I need to mock the Where Clause with some values.
I have tried the following
var parentClass = new ParentClass {id = 1};
var subClass = new SubClass
{
id=2,
ParentClassId = parentClass.id,
ParentClass = parentClass
}
var subSubClass = new SubSubClass
{
id =3,
SubClassId = subClass.id,
SubClass = subClass
}
var dbContext = MockRepository.GenerateMock<IDbContext>();
var subClassContext = MockRepository.GenerateMock<IDbSet<SubClass>>();
var subSubClassContext = MockRepository.GenerateMock<IDbSet<SubSubClass>>();
subClassContext.Stub(x => x.GetEnumerator())
.Return(null)
.WhenCalled(c => c.ReturnValue = new List<SubClass> { subClass }.GetEnumerator());
subSubClassContext.Stub(x => x.GetEnumerator())
.Return(null)
.WhenCalled(c => c.ReturnValue = new List<SubSubClass> { subSubClass }.GetEnumerator());
I am testing the following code
var existingSubSubClasses = context.SubSubClass.Where(cba => cba.SubClass.ParentClassId == parentClassId).ToList();
I am getting ArgumentNullReferenceException
What am I doing wrong?

You should also stub context.SubSubClass property -- seems like it returns null by default.

Having trouble getting method on mocked object to return fake data

I am trying to write a test for the "MethodToTest" like shown below
Public Class UserService()
{
private IRepository<User> _userRepo;
public UserService(IRepository<User> userRepo = null)
{
_userRepo = userRepo ?? new UserRepository();
}
public List<string> MethodToTest(string userName)
{
var user = _userRepo.Find(u => u.Email == userName).First<User>();
//Other stuff that eventually returns a List<string>
}
}
I have the following in my test
[Test]
public void GetItemsByUserName_UserName_ListOfItems()
{
var userName = "AnyString";
var fakeUserRepo = new Mock<IRepository<User>>();
var fakeUserList = new List<User>()
{
new User()
{
Email = userName,
Roles = new List<Role>()
{
new Role()
{
Name="Role1"
},
new Role()
{
Name="Role2"
}
}
}
};
var fakeUserListQueryable = fakeUserList.AsQueryable<User>();
var query = new Func<User, bool>(u => u.Email == userName);
fakeUserRepo.Setup(u => u.Find(query)).Returns(fakeUserListQueryable);
var userService = new UserService(fakeUserRepo.Object);
var menu = userService.GetMenuByUserName(userName);
//Assert Something
}
The problem is that I can't get the find method of the _userRepo to return my fake list of users.
When running the test I get a "Sequence Contains No Elements" when executing
_userRepo.Find(u => u.Email == userName).First<User>();
in the MethodToTest.
What am I doing wrong?

I'm thinking that you have an equality issue on the Func<User, bool>. As you know, Moq will setup the fakeUserRepo if the query equals the actual Func inside the code you are calling. However, you are creating a new Func<User, bool> in your setup code. So, when Moq checks equality, it is checking between two different reference types and therefore not setting up the expectation.
I would try something like this:
fakeUserRepo.Setup(u => u.Find(It.IsAny<Func<User, bool>>())).Returns(fakeUserListQueryable);
See if that works and then add the username back in.