Moq return null ambiguous. Is there a way to setup async return in more elegant way.

Moq return null ambiguous FetchAll ()). To overcome this you can use LINQ: var type = myObject. If you want to define a separate member returning separate type then do it so like below and now your mock shouldn't complain anything when you say child. Moq Test - Mocked Service Call Always Returns Null. Dec 11, 2011 · Try the generic version of Returns: var matchSetupRepository = new Mock<IMatchSetupRepository>(); matchSetupRepository . The following is a method in the BL layer which I’m trying to unit test. Repository as a reference by right-clicking in the dependencies and then Add Project Reference. This is my first time using Moq and running Mock Unit Tests. 2, the first two mock setups in the code below work as expected and return a Task<string> that resolves to null, while the third mock setup simply returns null. Mock<T> クラスを用いる。 new 時は <T> 部にモック化対象のクラスを設定し、引数にはモック化対象のコンストラクタのメソッドを設定する。 モック化されたオブジェクトは Moq#Object から呼び出す。 Returns Method (TProperty) Moq. May 28, 2012 · It is probably correct that only an Expression with the exactly same structure (and literal values) will match. It calls to a method in the DAL layer and Controller Mock return null for ActionResult other return types like int working fine #936; Method not found: 'Void Castle. getHtml()). IsAny<Entity>())) . When the mocked method is called without the optional parameter, null is passed for the nullable guid value instead of the one that was set up. UserName)) . Setup() for a mocked object, so why is there no It. Is<T>(o => o == null). IRequestRepository> Returns Nov 30, 2016 · You need to manually create and populate an IOptions<SampleOptions> object. Hot Network Questions Mar 31, 2021 · Moq has an It. Feb 25, 2011 · For the other problem with out serverCalled, you could argue that the void method could be bool instead, and that the other method could return null if we don't have a connection to the server (the last argument would be ambiguous as null could either mean object did not exist, or server was unavailable). Moq を用いたモック化では Moq. AmbiguousMatchException: Ambiguous match found. If I change the method's signature to return ICollection or IReadOnlyCollection, it no longer returns an empty collection, but null as I would expect. For example: IOptions<SampleOptions> someOptions = Options. FromResult(default(int))). 17. Nov 11, 2022 · can also be null; hence, Moq won't know which setup to call when both are passed as null. While the line of code is required is the commented line below, a full working example is provided below. I believe I am telling it to return a Person entity, but I am not sure where I am going wrong. Include lambdas? 5. Setup(x => x. Options helper class. Mar 13, 2017 · When using Moq, calling an unmocked method that returns an IEnumerable on a mocked object returns an empty enumerable. Empty) Mar 11, 2016 · What's happening is that when I setup a mock a call this one returns null instead of the value I'm telling to returns. I appreciate any suggestions. AreEqual("Hel… Apr 4, 2013 · Return is always null moq. Jan 15, 2013 · EDIT: Got your question wrong, again: The problem is that Match. Aug 18, 2020 · When some setup is not prepared, Moq by default returns NULL. ProxyGenerationOptions. Mar 7, 2025 · Moq allows you to set default return values for your mocks. I have a code like: MockRepository mockRepository = new MockRepository(MockBehavior. Examples. Is there a way to setup async return in more elegant way. Default); M Nov 22, 2022 · I have a function that I'm passing as a parameter like this: public async Task<Number> MeasureAsync<Number>(Func<Task<Number>> sendFunc) { //implementation } I want to Oct 22, 2024 · Directly following the Setup extension, as seen in the above snippet, the Returns extension is then used. But with MockBehavior. ThrowsAsync. May 5, 2006 · Zero to AI Hero, Part 2: Understanding Plugins in Semantic Kernel, A Deep Dive With Examples Jan 14, 2016 · My problem is that my Person object is never created, that is, it always returns a null value and the exception is always thrown. Length == 3); returns a string. ReturnsForAnyArgs() has the same overloads as Returns(), so you can also specify multiple return values or calculated return values using this approach. However, you can change this behavior by setting the DefaultValue property to DefaultValue. IsAny<MyTableDTO>())). Is<IDataModel>(x => x != null), It. Type)'. Note that this post, like the last one, will use the use case of making HTTP calls, but the same logic in it will hold true for any async calls being made. But I am having a problem a Dec 4, 2014 · Returns(Task. My method returns just Task so I don't have a parameter for ReturnsAsync(). My test method: The last assert fails as the manager under test returns an empty list. It can only be used inside the . I suspect you tried to call it with Returns(null), which causes the compiler to complain since Returns is overloaded and it doesn't know which method should be called. ProfileID }); Feb 22, 2009 · Moq Factories. When I try to use my mocked GetProfileFromUserName method, it returns null. Returns((Entity e) => Task. You can change your Setup() to return myDto: _myRepoMock. This means that a call to that method/property with any parameters will not fail and will return a default value for the particular return type. Apr 11, 2013 · var mock = new Mock<IFoo>(); mock. Create<SampleOptions>(new SampleOptions()); Jul 26, 2011 · I'm struggeling with using moq and validating parameters passed to the methods of mocked interface. DbSet Find with Moq (EntityFramework. Setup(gp => gp. Here’s a sample for the factory initialization: Nov 22, 2018 · Why you are changing or forcefully hiding the base type and that's the issue here. : Sep 7, 2012 · This was the bug within moq library at the time when the question was raised(moq 4. Try. I suggest that you use the overload of Returns() that lets you use the parameters the mock is called with: Jan 9, 2023 · The default behaviour of a Moq Mock object is to stub all methods and properties. Returns (TResult)' and 'IReturns. It would be nice if method checked that function is not null and threw ArgumentException with the message giving a hint to the reason of this oddity. The same happens with It. Jul 23, 2024 · By effectively using Moq to handle null return values in your unit tests, you can ensure that your code behaves as expected in scenarios where null values are returned from methods or properties. Returns (() => null); //Setup "out" parameters Address address = new Address {Country = "Sweden", City = "Stockholm Aug 29, 2017 · When the mocked method is called without the optional parameter, null is passed for the nullable guid value instead of the one that was set up. DynamicProxy. Setup(ms => ms. You can do so via the Microsoft. Method(null); } public class TestClass<T Aug 18, 2020 · I’m trying to unit test a method using MSTest and MOQ but it always fails. I don't know why a similiar Setup works but this one just doesn't. method1Test threw exception: System. getHtml(); Assert. Mocking a method that returns a method call to another object. EF6 DbSet<T> returns null in Moq. Returns(1); You will quickly find that the this code fragment does not compile. Here goes the error: Due to how overload resolution works in C#, configuring a method or a property to return a null value requires some attention. Returns((SomeType)null) is "inferred" to Returns(SomeType value) which has no problems. AddDelegateTypeMixin(System. 0. Aug 3, 2017 · You get null because GetDto() returns object different from myDto - references are different. Mock object is null in unit test. MyClassTest. FromResult, e. IsNull<T>? Seems like a logical addition, and it would achieve the same as the rather more verbose It. Save(It. 1 and . Sep 13, 2016 · Return is always null moq. Returns() and Task. Object. Basically any method that takes in byte[]? as type, and can return a nullable return. Jan 14, 2016 · My problem is that my Person object is never created, that is, it always returns a null value and the exception is always thrown. ReturnsAsync and setup. Explicit . 4. Returns (Func)' Jul 16, 2012 · Moq - Return null - This working example simply illustrates how to return null using Moq. You can simply return a Task with the desired values using . Jun 23, 2010 · The first three setup statements will not compile because of an ambiguous invocation: Moq. This can be a universal use-case and not specific to operator. I'm hung up when specifying mock data to be returned from a mocked repository. If you call ReturnsAsync(null) compiler selects the overload which accepts a function, not a value. 2. g. Returns(null) will cause a compiler error: CS0121 The call is ambiguous between the following methods or properties: 'IReturns. String, and verify will check against that as a value (and fail because that value will be just String. IsNotNull<T> option when doing a . This level of testing helps improve the reliability and robustness of your C# codebase. May 5, 2006 · Zero to AI Hero, Part 2: Understanding Plugins in Semantic Kernel, A Deep Dive With Examples May 26, 2022 · Once the project is ready, let’s add the MockAsynchronousMethods. How do I mock multiple levels of DbSet. MoQ does not set the Returns method. As a result test fails with NullReferenceException which is very confusing. FromResult(default(int))); I don't like last line: . Returns<IEnumerable<MatchSetup>>(null); or: When I use ReturnsAsync(null) in a C# unit test method in Visual Studio (with Moq), I get the error: "The call is ambiguous between the following methods or properties" and then a list of the ReturnsAsync methods which have different parameters. GetProfileFromUserName(userProfile. By default, if you do not specify a return value, it will return null for reference types. It. Setup(obj => obj. IReturnsResult<Core. Verify() call. In this scenario I want to test that my application will handle the case that when a call to a service throws an exception, it will retry and if it receives a valid response on the second try, process the request successfully and continue. For the next step, we need to install the Moq Framework: Jul 12, 2012 · The ambiguity occurs because of the new declaration in MyDerivedEntity. Here is my Test Class Feb 24, 2014 · Scenario – Throw an exception the first time a mocked method is called, return a value the second time. The only two configuration available is CallBase and DefaultValue. Having trouble getting a Mocked method to return null. So I used built unit testing framework by Microsoft. 1. 0 when I try to use natural mocks with my code which uses generics: Test method TestProject1. using System; public class Program { public static void Main(string[] args) { var c = new TestClass<string>(); var o = c. GetAll()) . Language. FromResult(new StoreResult {Entity = e})); The key difference is to specify the type for the input parameter of the lambda expression in order to avoid ambiguous calls. Returns(myDto); Or if you want to return object which was passed as a parameter: Jul 16, 2012 · Moq - Return null - This working example simply illustrates how to return null using Moq. Net 2. Basically: If you box a nullable value that has a value, you get a boxed version of the value, so a boxed version of (int?)1 is the same as a boxed version of 1 Jul 17, 2021 · If no student in repository has such Id, it returns null. Every mock created with the factories will allow you to reuse the configuration and reduce the amount of line for setting up the mock. I suspect you tried to call it with Returns(null), which causes the compiler to complain since Returns is overloaded and it doesn't know which method should be called. Reflection. I am using Moq to mock data in Unit Test. StoreAsync(It. – Jan 12, 2021 · C# Moq framework return null reference not correct object. Dec 9, 2021 · This question is about how do I return null value from mocked Method<byte[]?>(). Is<IDictionary<string, object>>(x => x!= null) in the first setup and check if it compiles. mocking a method using Moq framework doesn't return expected result. This is the code for retrieving the profile, which doesn't work: mockUserRepository. Dec 28, 2021 · I am using Moq to mock my service layer in unit test for a post api call, and the _service. Aug 1, 2016 · moq . SetupGet(x => x. Moq have factories to help centralize the mocking configuration. 10827) but it is solved here. This means that instead of returning null, the mock will return another mock of the requested type The same behaviour can also be achieved using argument matchers: it is simply a shortcut for replacing each argument with Arg. I know there is a method ReturnsAsync() but it has a parameter. Every single attempt to call anything from the Aug 15, 2023 · This is part 2 in a 2-part series: Part 1: How to use IAsyncEnumerable in C# for paged APIs. Feb 21, 2025 · Returns (new List < Customer > ()); //Setup return value (usng lambda expression) mockRepository. Part 2: How to test and mock IAsyncEnumerable in C#. Create() returns a tuple value: Task<(Model. Mocking DbSet<T Mar 5, 2007 · Hi, I'm getting the following exception using TypeMock 3. Returns(new Profile { ProfileID = userProfile. 3. User1). In fact, simply typing . Extensions. Here is my Test Class Your method doesn't have any callbacks so there is no reason to use . Mock. What are they? These extension methods allow you to set up the result of an async method call without having to manually wrap the desired result in a task: Jul 22, 2017 · やりかた メソッドの返り値を設定するときに Returns の代わりに ReturnsAsync を使う。 コード [TestFixture] public class TestClass { [Test] public async Task TestMethod() { var hogeMoq = new Mock<Ihoge>(); hogeMoq. Testing. Moq) 3. Bar(null)). Setup(foo => foo. Options. Thank you. Repositories. Returns (() => new List < Customer > {}); //Return NULL mockRepository. Returns(Func)' Jan 2, 2021 · Another part of Moq that is obsolete for the most part is the async setup helper verbs setup. Setup (r => r. previous page next page The value to return, or null Nothing nullptr a null reference (Nothing in Visual Basic). ReturnsAsync("Hello World"); var Actual = await hogeMoq. Casting to a specific type removes the ambiguity. Strict, it will throw an exception. This is considering DuplicatePaymentCheck inherits from PaymentModel. Setup(m => m. Aug 29, 2017 · IVehicleRecordsRepository mock is set up with a specific (new) guid, which I suppose is not stored and reused in anywhere. . Mar 5, 2018 · Returns(null) doesn't compile due to ambiguous invocation. Receipt Receipt, bool IsIdempotent)> therefor I created a tuple result and pass as ReturnsAsync like below: Mar 12, 2019 · E. </returns> public Student GetStudentById (int id); /// <summary> /// Asynchronously returns all the students in the repository /// </summary> /// <returns>A list of students in the repository</returns> public Task < List < Student >> GetStudentsAsync ();} public class StudentRepository . I am doing unit testing in my project. Any<T>(). Is<string>(Expr), if you extract a variable it will be passed as a simple System. CallBack(). Returns(Task. Apr 27, 2022 · Using Moq 4. Create<string> (s => s. NET project. Returns(user. It is possible now to make setup with Nullable<T> and make invocation with null, works perfectly. #935; Ability to evaluate "verify" after a certain period of time #931; Problem when mocking an interface with hidden property of different type #930 May 3, 2016 · I am developing a ASP. Due to how overload resolution works in C#, configuring a method or a property to return a null value requires some attention. Flow. You call Setup method for any or all of the following reasons: You want to restrict the input values to the method. Returns<SomeType>(null) is "inferred" to Returns(Func<SomeType> valueFunction) which is simply set null delegate with ReturnValueKind. A similar method named GetEmail works. Mar 11, 2016 · What's happening is that when I setup a mock a call this one returns null instead of the value I'm telling to returns. 7. GetType(); var colName = "MyEntity"; var Jun 16, 2011 · The reason for this is that boxing a nullable value doesn't really box the Nullable<T> value, it boxes the value inside. Object);. Returns(TResult)' and 'IReturns. I would have expected it to return null. I want to test the flow when such a method returns null value. Moq doesn't require the use of a Return for a given setup, but for this example, let's make use of it as we're expecting a result from the method. otxdyl iqx xldvfqm eamvq gdxyxkt sghkt qvgz rlkhz gumrbbg bzdpn vyrtm xfem kkjti mlt jmphghc