I wrote the unit test using MOQ. When setup the mock I am trying to create the object of class in Linq query. After that I am trying to run the Unit test, but I get below error message.
"When called from 'VisitMemberInit', rewriting a node of type
'System.Linq.Expressions.NewExpression' must return a non-null value
of the same type. Alternatively, override 'VisitMemberInit' and change
it to not visit children of this type."
I have written code like below -
_mockLdapAuthenticatorService.Setup(x => x.Authenticate(
new LoginRequest {
Username = It.IsAny<string>(),
Password = It.IsAny<string>() })).
Returns(new AuthenticationResult { Success = true });
Update the setup. The following is probably what you were trying to achieve.
_mockLdapAuthenticatorService
.Setup(x => x.Authenticate(It.IsAny<LoginRequest>()))
.Returns(new AuthenticationResult { Success = true });
For me, a problem was this new operator when sending parameters to a function. When I create a variable for it and then send the variable as a parameter it worked without error.
NO:
var absentUser = _fixture.Create<User>();
var absentUsers = new List<User> { absentUser }.AsQueryable();
_unitOfWorkMock.Setup(_ => _.UserRepository
.GetAllConfirmedUsersForGroupIds(new List<int> { It.IsAny<int>() }))
.Returns(absentUsers);
YES:
var absentUser = _fixture.Create<User>();
var absentUsers = new List<User> { absentUser }.AsQueryable();
var groupIds = new List<int> { It.IsAny<int>() };
_unitOfWorkMock.Setup(_ => _.UserRepository.GetAllConfirmedUsersForGroupIds(groupIds))
.Returns(absentUsers);
Related
I am trying to mock HttpRequestBase and HttpSessionStateBase objects and test my code with Moq mocking framework.
This is the relevant part of my setup.
_httpSessionStateBase = _mockRepository.Create<HttpSessionStateBase>();
_motorWebSession = new MotorWebSession
{
PersonaIdentifier = Guid.NewGuid(),
NameIdentifier = Guid.NewGuid(),
MiCurrentPageId = Guid.NewGuid(),
MiSessionId = Guid.NewGuid(),
};
_httpSessionStateBase.SetupGet(e => e.Count).Returns(1);
var keysCollection = new NameValueCollection { { "MotorSession", "MotorSession" } };
_httpSessionStateBase.SetupGet(e => e.Keys).Returns(keysCollection.Keys);
_httpSessionStateBase.Object[0] = _motorWebSession;
_httpSessionStateBase.Object["MotorSession"] = _motorWebSession;
_httpContextBase = _mockRepository.Create<HttpContextBase>();
_httpContextBase.SetupGet(h => h.Session).Returns(_httpSessionStateBase.Object);
In the current implementation this code is called within a test.
var webSession = _httpContext.Current.Session;
var sessionObject = webSession.Keys.Cast<string>()
.Where(w => webSession[w] is WebSessionBase)
.Select(s => webSession[s])
.ToList().FirstOrDefault();
During the Where clause sessionObject results into null which prevents any other subsequent code to run correctly. Is there something wrong I am doing with the setup? Or could the code be altered to work for this setup? It worked with Rhino.Mocks but I am trying to change it to Moq.
Instead of _httpSessionStateBase.Object["MotorSession"] = _motorWebSession; call _httpSessionStateBase.Setup( s => s["MotorSession"]).Returns(_motorWebSession);. Moq mocked objects can't be assigned directly even through index using the [] operator. The correct way to do that is to make a setup.
I need to mock my IVehicleRecordsRepository for some tests. So here's the repo interface:
public interface IVehicleRecordsRepository
{
Task<VehicleRecord> StoreAsync(VehicleRecord veh, Guid? userId = null);
//...
}
and now I try to mock it in the xUnit test so StoreMethod() should return the same value that was passed in as a parameter. Here's the test that tests this scenario:
[Fact]
public async Task ShouldGetValueFromMockedMethod()
{
var mockRepo = new Mock<IVehicleRecordsRepository>();
mockRepo
.Setup(repo => repo.StoreAsync(It.IsAny<VehicleRecord>(), Guid.NewGuid()))
.ReturnsAsync((VehicleRecord veh, Guid userId) => veh)
// tried this too -> .Returns((VehicleRecord veh, Guid userId) => Task.FromResult(veh))
;
VehicleRecord vr = new VehicleRecord(newVehicle, Guid.NewGuid());
var testVeh = await mockRepo.Object.StoreAsync(vr);
Assert.NotNull(testVeh); // ====> FAILS HERE
Assert.AreEqual(vr, testVeh);
}
So, how can I get the same value I passed into StoreAsync() in return ?
Moq version: 4.7.99.0
I've not used Moq, so forgive my ignorance.
In your act statement:
var testVeh = await mockRepo.Object.StoreAsync(vr);
you're only passing in the Vehicle Record ('vr'), but your mocked object is set up to also expect a Guid.NewGuid(), correct?
mockRepo.Setup(repo => repo.StoreAsync(It.IsAny<VehicleRecord>(), Guid.NewGuid()))
Could it be that it's not matching the expectation and therefore, never calls the "(mockObject.)ReturnsAsync" method?
Have you tried doing something like:
var guid = Guid.NewGuid;
VehicleRecord vr = new VehicleRecord(newVehicle, guid);
var testVeh = await mockRepo.Object.StoreAsync(vr, guid);
Or, perhaps simplifying it a bit, change your mockObject to not expect a Guid, since you're passing in only the VehicleRecord:
mockRepo.Setup(repo => repo.StoreAsync(It.IsAny<VehicleRecord>()))
I have the following method in my NewsDataService class
public IEnumerable<NewsModel> GetImportantNews()
{
var result = this.newsfeedRepository.GetAll(
x => x.IsImportant == true,
x => new NewsModel()
{
Creator = x.User.UserName,
AvatarPictureUrl = x.User.AvatarPictureUrl,
Content = x.Content,
CreatedOn = x.CreatedOn
})
.OrderByDescending(x => x.CreatedOn);
return result;
}
My question is...
How do I setup the mocked service method (GetImportantNews),
so that it returns a list of NewsModel which are "Important"?
My idea is something like this, but it is not working so far, because it is always returning the full list.
var expectedResult = new List<Newsfeed>()
{
new Newsfeed()
{
IsImportant = false,
},
new Newsfeed()
{
IsImportant = true
}
};
mockedNewsfeedRepository
.Setup(x => x.GetAll(
It.IsAny<Expression<Func<Newsfeed, bool>>>(),
It.IsAny<Expression<Func<Newsfeed, NewsModel>>>()
)).Returns(expectedResult);
Basically what I want is my "expectedResult" to be filtered by the logic in the method.
You have access to the invocation arguments when returning a value. Apply the predicate and projection expression arguments to the fake data source using linq like in the example below.
mockedNewsfeedRepository
.Setup(x => x.GetAll(
It.IsAny<Expression<Func<Newsfeed, bool>>>(),
It.IsAny<Expression<Func<Newsfeed, NewsModel>>>()
))
// access invocation arguments when returning a value
.Returns((Expression<Func<Newsfeed, bool>> predicate, Expression<Func<Newsfeed, NewsModel>> projection) =>
expectedResult.Where(predicate.Compile()).Select(projection.Compile())
);
Source: Moq Quickstart
I'm attempting to mock and setup chained methods using Moq.
Here is the method I am trying to mock:
TeamMember teamMember = _unitOfWork
.TeamMembers
.Query()
.ToList()
.Where(t => t.AssociationCode.ToString() == code
&& Crypto.EncryptStringAES(t.Id.ToString(), sharedSecret) == hash)
.SingleOrDefault();
and here is where I attempt to mock it:
var unitOfWorkMock = new Mock<IUnitOfWork>();
var iQueryableMock = new Mock<IQueryable<TeamMember>>();
var iToListMock = new Mock<List<TeamMember>>();
var whereMock = new Mock<IList<TeamMember>>();
var singleMock = new Mock<IEnumerable<TeamMember>>();
unitOfWorkMock
.Setup(u => u.TeamMembers
.Query())
.Returns(iQueryableMock.Object);
iQueryableMock
.Setup(i => i.ToList())
.Returns(iToListMock.Object); //This line throws the error
whereMock
.Setup(w =>
w.Where(It.IsAny<Func<TeamMember, bool>>()))
.Returns(singleMock.Object);
singleMock
.Setup(s =>
s.SingleOrDefault())
.Returns(new TeamMember()
{
Email = "Test#TeamMember.com"
});
When I run this test it gives me this error:
Expression references a method that does not belong to the mocked object: i => i.ToList<TeamMember>()
I have looked at this question already and have tried to do something similar, but I must be missing something.
I am new to this, so if anyone can help me out it will be greatly appreciated.
Your method chain mocking looks fine, but your problem is that ToList is an extension method, which Moq cannot mock.
I want to test that a method adds a record to a DBSet under a certain condition:
public static void AddTriggeredInternalTransactions(IDataContext dc, ExternalTransaction transaction)
{
if (transaction [meets condition A])
dc.InternalTransactions.CreateInverseTransaction(transaction);
// do other stuff under other conditions
}
private static void CreateInverseTransaction(this IDbSet<InternalTransaction> transactions, ExternalTransaction from)
{
var internalTransaction = transactions.Create();
from.CopyToInternalTransaction(internalTransaction);
transactions.Add(internalTransaction);
}
Now, I already have tests for CopyToInternalTransaction(). I just need to call AddTriggeredInternalTransactions() and verify that [condition A] results in the new record being added).
I started with http://msdn.microsoft.com/en-us/data/dn314429.aspx, then used other Google and StackOverflow searches. Before tackling my "real" test, I'm trying to do a simple test just to verify whether a record has been added to a dataset, but I'm stuck on this. Can anyone point out my flaw(s)?
var internals = new Mock<DbSet<InternalTransaction>>();
var theData = new List<InternalTransaction>().AsQueryable();
internals.As<IQueryable<InternalTransaction>>().Setup(m => m.Provider).Returns(theData.Provider);
internals.As<IQueryable<InternalTransaction>>().Setup(m => m.Expression).Returns(theData.Expression);
internals.As<IQueryable<InternalTransaction>>().Setup(m => m.ElementType).Returns(theData.ElementType);
internals.As<IQueryable<InternalTransaction>>().Setup(m => m.GetEnumerator()).Returns(theData.GetEnumerator());
var mockDC = new Mock<IDataContext>();
mockDC.Setup(q => q.InternalTransactions).Returns(internals.Object);
mockDC.Setup(q => q.InternalTransactions.Create()).Returns(new InternalTransaction());
mockDC.Setup(q => q.InternalTransactions.Add(It.IsAny<InternalTransaction>()));
var it = mockDC.Object.InternalTransactions.Create();
it.Id = "123";
mockDC.Object.InternalTransactions.Add(it);
internals.Verify(e => e.Add(It.Is<InternalTransaction>(d => d.Id == "123")), Times.Once());
//or: Assert.Equal(1, mockDC.Object.InternalTransactions.Count());
This test fails with: Expected invocation on the mock once, but was 0 times: e => e.Add(It.Is(d => d.Id == "123")) No setups configured. No invocations performed.
The Assert statement, if used instead, fails with a NotImplementedException: "The member IQueryable.Provider has not been implemented on type DbSet~1Proxy_1 which inherits from DbSet1. Test doubles for DbSet1 must provide implementations of methods and properties that are used."
After comments by Adam and Stuart plus further experimentation, I was able to reduce my test case to the following working test case:
var internals = new Mock<DbSet<InternalTransaction>>();
var mockDC = new Mock<IDataContext>();
mockDC.Setup(q => q.InternalTransactions).Returns(internals.Object);
internals.Setup(q => q.Create()).Returns(new InternalTransaction());
var transaction = new ExternalTransaction { [set criteria for Condition A] };
SomeBusinessObject.AddTriggeredInternalTransactions(mockDC.Object, transaction);
// verify the Add method was executed exactly once
internals.Verify(e => e.Add(It.IsAny<InternalTransaction>()), Times.Once());