Moq verify ienumerable parameter It. Now if Moq - verifying a call with parameter that is changed during the execution of the test. e. 28 Mock IEnumerable<T> using moq. Moq setting up variables inside a method. Moq fails because it expects a return value but doesn't let me provide it. IEnumerable`1[SomeOtherClass]' Source=System. Visit(ref It. Is (x => x == ExpectedParameter) • The lambda expression can be as complex as you like, as long as it returns a Boolean • !! Important !! Mark it verifiable! Once we've executed the method that we're testing (Reverse), we want to determine if we're actually checking if the log is enabled. Ask Question Asked 11 years, 10 months ago. Is<>, verifying it is the same instance of the object. How to verify method arguments after method call? 5. Method 1: • Use Setup (which has taken the place of Expect) • Use It. Take a look at the following [TestClass] public class MoqSetupWithListParameterTests : MiscUnitTests { //m_Items is a static list I filled in the Class Initialize, and is not empty. How can I mock a collection using Moq. Once we've executed the method that we're testing (Reverse), we want to determine if we're actually MOQ - verify method with parameter executed regardless of the parameter used. cannot invoke callback with parameters (Object). EntityFrameworkCore. 0 and xUnit 2. It has a bit more complicated matching created. Verify method has been called with IEnumerable containing 'x' elements with Moq. ArgumentException was unhandled by user code HResult=-2147024809 Message=Expression of type 'System. The one approach is what Owen suggested to use It. DoSomething(method); } } class Someclass { public DoSomething(string E. Setup(mr => mr. Verify() asserts that the method call happened as expected with the specified parameters. 1 How to verify that method argument's property values are set when mocking methods with Moq? 136 Mocking objects with Moq when constructor has parameters I am working on a C# application, which uses Moq for testing. The substitute call becomes this: I am fairly new to unit testing in C# and learning to use Moq. Create(ids); } The test in Moq looks like this: repository. How to mock/setup a method with IEnumerable input parameters using Moq? 0. Since you use Capture directly in the parameter list, it is far less prone to issues when refactoring a method's parameter list, and therefore makes tests less brittle. Hot Network Questions Is there any problem with too much (or false) precision? The behaviour you describe is the default behaviour of the moq, you can see it here. ThrowVerifyException(MethodCall I believe you need to do the following. Apologies, the code which sets up the mock should have been var mockManager = new Mock<ICandidateManager>(); mockManager. Where(predicate)); should work. When I call Verify, Moq takes a long time (several minutes) to respond, and sometimes crashes with a NullReferenceException (I guess this is understandable, given the amount of data that Moq would have to accumulate to do the Verify from a "cold start"). NET 4 (not Mono) under Windows 64 with Moq 4. IsAny< string >())) . delegate IEnumerable<SomeOtherClass> GetSomethingCallback(DateTime start, DateTime end, out bool someFlag); This does not work in recent versions of Moq (since at least 3. 2. Create(It. Because It. . 12. 4. I know this question was asked too many times here but I still cannot figure out what is wrong with my code. Unit test LINQ Enumerables. IsAny which works on ref, in (since they are by-ref parameters) and out parameters. 0. I use underscore by convention because I don’t actually care what that thing is or use any of its Moq Match and Verify Array / IEnumerable parameters in method setup. service. Exactly(2) Performed invocations: IX. I know this is an old question, but the one answer given here did not work for me and I was able to figure it out. Verifiable(); Obviously, remember to put the using statements linking this file to wherever you have your enum type saved. Setup(s => MOQ - verify method with parameter executed regardless of the parameter used. How to mock/setup a method with IEnumerable input parameters using Moq? 32. In you case the expectedA. The call to Verify will suffice. someMethod( It. I've hit a snag when using Moq to simulate an dependency which is called a large number of times. LogTrace( It. If moq finds an IEnumerable, it uses SequenceEqual to compare the actual argument and the argument used in the setup, otherwise it just uses Equals Hi, thanks for the responses so far. Moq Match and Verify Array / IEnumerable parameters in method setup. Verify(x => x. Mocking a list of objects. We can use this changing our code to visitor1. ). AddRange(It. Is<Test>(constructor parameter equal to 5))); c#; moq; Share. IsSubtype Verify: expression: Expression<Action<'T>> * times: Times -> unit Here's a simpler example that should make the difference clear: Verify(fun x -> x, 1) // call Verify with a single argument (a lambda that returns a tuple) Verify((fun x -> x), 1) // call Verify with two arguments (a lambda and the literal value 1) Verify method has been called with IEnumerable containing 'x' elements with Moq. WriteLine(item); } } How can I configure a mock of TextWriter to . Verify(c => c. Setup(m => m. See Equals method documentation for an explanation that the target method (and target instance for non-static methods) must be the same. Once); ``` I can verify that it was passed the expected two objects using some of Moq's partial matching like this: ``` As @StriplingWarrior mentioned you've got to specify the arguments when using Verify. How to mock a Class with IEnumerable. I believe that most of the popular testing frameworks today provide Moq Documentation Verify Method Moq. IsValueType and It. So if you want to use It. I'd not recommend to implement it for IEnumerable or other interfaces because you could have a huge (or even infinite) sequence there. Normally, I would handle this by doing myMock. IList with Moq. Taken from Moq Quickstart documentation. If it find IEnumerable then it uses . Generic. _mockUserRepository. Expression. Correct. Update(It. mockedClass. So there is no general matching so It. Internal. Returns((Expression<Func<Company, bool>> predicate) => companies. GetEnumerator() at Moq. Verify and set list parameter in function of mock object. Add(new DataClass { Id = 20 + i }); Then create a mock of the IEnumerable class and setup its m => m. Generic Method for Mock (Moq library) to verify a method was NEVER called with ANY parameter combination. Is anticipates a delegate where the parameter is the current value and the return type bool. InternalDbSet`1. For example, let’s say you’re trying to unit test the following method: public IEnumerable<Employee> You could just create an array. 5 How to mock a method that returns List<T>? Strict); //unexpected calls causes VerfyAll to fail //Set default value behavior (Empty, Mock, Custom) //Empty = returns default value (null for refences) //Mock = returns default value for value types and Mock objects for reference types (always returns the same mock object for the same method or property) //Custom = Doc says set the Moq Unhandled Exception: Moq. Verify using Moq that only these two method calls where called, and nothing else Also interesting for enhancing reporting is when you have array parameters, which is specially useful for params methods. IsAny yet. AppendValueOf(StringBuilder stringBuilder, Object obj) in C Moq. In order to overcome of this you need to use It. IsAny<IEnumerable<string>> in the assertion) and it works correctly with Moq v4. IEnumerable. 8 or later) Create a delegate to handle the mock invocation. When you need to verify that the code under test called a method with the expected parameters, you can mock the method with Moq and use Verify() + It. E. Controller MOQ - verify method with parameter executed regardless of the parameter used. The solution is both elegant and hacky. In this case, you want to ensure that GetAllCodes() utilizes and interacts with the cache and the EF Context correctly, as per above. How to mock a method returning IEnumerable<T> in unit test method? 1. Is<string>(s => When you need to verify that the code under test called a method with the expected parameters, you can mock the method with Moq and use Verify () + It. Hot Network Questions In Verify Moq by default checks reference equality for arguments so it only passes when you provide the same instances (except if you've overriden Equals) in your tests and in your implementation. However, if you need more advanced functionality than this, you might be better off writing a class that implements IRepository<Company> rather than using Moq, since building It. add something like . 7. While refactoring a project I ran into an issue where consumers of an IEnumerable<T> method assumed that the returned enumeration could be enumerated many times. 40. IsAny always return a default value of input. I have a generic method as shown below, public interface IMemoryCacheWithPolicy { TItem GetOrCreate<TItem>(object key, Func<TItem> createItem, CacheItemPriority priorityLevel); } If I add . Elegant in that it provides a fluent syntax that feels at-home with other Moq callbacks. ExecuteAction(new ClassAParams { RequestedId = 1, SomeValue = "something" })); The problem is, I do not want to check the value of the SomeValue parameter, or any other ClassAParams properties in this unit test. Object); // However, I also use IEnumerable as the input to a 2nd method. ( x => x. So for instance, I have a method as such: IEnumerable<Pick Moq Match and Verify Array / IEnumerable parameters in method setup. CallBack and then call remote. IsAny where T is the out parameter type (Moq version 4. Expressions. Name, System. Moq: multiple tests through params, one test method. 0) Share I am getting a "System. IsAny<CspParameters>()), Times. ArgumentNullException : Value cannot be null. AtMost(0) after the Returns statement. As for multiple calls there are several approaches. Object, mockChild. d1. DoSomething(foo)). My extension: public static void VerifyMultiple<T, TItem>(this Mock<T> value, Action<T, TItem> action, Times times, IEnumerable<TItem> items) whe New to Moq Trying to mock an update method that passes a list of thisMovieIndexEntries of type below. System. Mocking a Method that uses an Optional Parameter using Moq. Setup(x => x. How do I amend the Verify above to check that the IEnumerable of Results contains Results I can test against. Mock a method with List<int> as parameter and return List<> with Moq. Equals(customerDto. Verify () asserts that the Moq's built-in type matchers (It. But now it should work the way you wrote. Is(x => x == ExpectedParameter) • The lambda expression can be as complex as I'm trying to verify a call was made to a repository AddRange method. How to use moq to verify that a similar object was passed in as argument? 126. InvariantCultureIgnoreCase)), It. Here is my unit test code: var sender = new Mock<ICommandSender>(); sender. Follow Moq: Verify object in parameter null reference. problematicMock. 11. c# Moq a method with an optional parameter. I would suggest confirming that you're running the latest binary of Moq, checking your project references, and trying some very simple verification tests to insure that Moq is working. 0 added support for matching I needed to mock the PushPageModel method and verify that it was called with the correct page I came up with the following Setup call (the It. Now I want to check if method was invoked with parameter of type Test, that has constructor parameter equals to 5. 12. Now how can I verify if the called Write Method, public class DBStore { public virtual void Write(string retailName, List<CustomerInfo> list, List<Order> orderList) { } } had Customer Name "a" and the count? I'm trying to see if Moq is something I'd like to use in a new project as the other mocking frameworks I've used are challenging IMHO. Call same method twice with different parameters. Is<IEnumerable<ResultRecord>>(item => What GOES HERE?))); Moq returns the same result for different IEnumerable parameter setups. IsAnyType, It. Verify(x => First, create a list containing the information that needs to be returned by the mock: list. Equals under the cover to test if the ImageFilterOptions parameter that the method was called with is the same instance as the one you supplied in the call to Verify. 0. previous page next page Collapse All Expand All C#. ValidateLambdaArgs(Type delegateType, mock. > System. g. Method(It. I want to check if the content of the message is what I sent in. Equals(d2) can return false. Verify(method => method. If you just want to verify this method is called, you should use Verifiable() method. MockException : Must change next item. For example: . Using Moq to verify a parameter of type List<>? 126. For setting up and verifying a function that is called multiple times, I usually call setup or verify (Times. When you’re using Moq to set up a mocked method, you can use Callback() to capture the parameters passed into the mocked method: string capturedJson; mockRepo. 10: Avner Kashtan provides an extension method in his blog which allows setting the out parameter from a callback: Moq, Callbacks and Out parameters: a particularly tricky edge case. Here's a method I need to unit test: void Do(IEnumerable<string> items, TextWriter tw){ foreach(var item in items) { tw. Different return values the first and second time with Moq. ) I wrote up a simple one below; You setup expectations on the mock object, specifying the exact arguments (strict - if you wish to ofcourse, else use Is. InsertCandidate(new Candidate(), out errors)); When I put a break point on the actionResult line I can see that errors contains the two items I expect, but when you step into the controller I am currently writing unit tests for a CommandHandler. Once()); I often encounter this when using Moq Verify to verify a large number of conditions in the Verify, where the method must have been called with specific parameter values which are not primitives like int or string. Rather than expecting a specific object when creating the substitute call, I expect any instance of type IEnumerable<string> and create a callback when checking the Received() call that actually verifies the values. So, in your case: Func<Dictionary<string, object>, bool> In order to test your assumptions you can create the following helper method: private static bool AssertBar(Dictionary<string, object> bar) { Assert. IsAny<IEnumerable<Thing>>()), Times. Mock a method with parameter. SequenceEqual() Since Array is Ienumerable it should work for you. Except(removedIds). From ( It. I am using the following code to Setup the Moq response You want to call the real GetAllCodes() method to test it, otherwise you are just testing the mock :). WriteLine("Repository. { var existingIds = repository. Unit testing with Moq. Create(null) IX. _mock. Capture is a better alternative to Callback IMO. IsAny)). Can't get Moq to return a When running unit tests to verify logger is called as expected, Moq. Is inside your Verify. Is<bool> matcher is used to match the optional method parameter): coreMethodsMock . IsAny() won't work. One of the functions accepts various parameters but one of them is a List<MyObject> where MtObject has an Id. The evaluation happens before the method is ever invoked. Single(bar); Assert. Mocking objects with Moq when constructor has parameters. public async Task<IEnumerable<CustomerDto>> GetCustomers(bool active) { return _mapper. Moq version 4. IsAny at Verify you should Setup for target method first:. Please correct me where I doing it wrong. Proper way to verify parameters being passed to a Mock are set as expected. Returns(CreateList()); service. I have a class implementing singleton. SendCommand(It. : where T: Foo). 308. Once()) for each call that I expect - often with a for loop. Get(); IEnumerable<int> ids = existingIds. Using Moq to verify in C#. Save(json) called. Reflection. Everything you have posted is correct. Ref<T>. I am trying to write an extension method for Mock to verify a call to every item in a list. 13 the It. ----> System. Send(new GetCustomersQuery { I am using MOQ for mocking my interfaced repositories. Verify after the target (or, I assume, set the mock to strict) it always fails because the parameter I provide in the test is not the same instance as the one that is created in the controller method. Save(It. The class uses a web service proxy to access dat I am trying to use Moq to write a unit test. So how can i use mocking (moq) to verify that CheckIn is setting the IsCheckedOut property? Thanks. :: This example sets up an expectation and marks it as verifiable. PushPageModel<It. For Moq version before 4. Equal("KeyA", In this way, you can use it locally and run assertions directly to that object without relying on the Verify method. (Arrays implement the IEnumerable<T> interface. Is<string>(n => n. However that is default behaviour(if you setup using an instance, Constant matcher) and you could override it. Hot Network Questions Moq Match and Verify Array / IEnumerable parameters in method setup. You are not returning anything from the Delete. Collections. Tag("arbitrary") to Setup and also expose lists of Setups on the mock with the following (at minimum): interface ISetup { void Verify(); IReadOnlyList<string>Tags { get; } }-- then I can iterate the setups, pick The Moq mocking library in version 4. Verify method called with parameter and call order. 4. However Moq does provide the Invocations sequence (unsure what version it was introduced, YMMV) so it is possible to basically do what you're asking. Based on my understanding, there is no way to mock the generic type argument in this scenario . ArgumentNullException when verifying method call on EF Core mocked DbContext when the method has not been actually invoked but some DbSet at Microsoft. Mocking using Moq in c#. – This causes problems when you’re unit testing and trying to mock a method that has an anonymous type parameter. _myClassMock. Foo foo = // Existing foo instance Mock<IMyInterface> mock = new Mock<IMyInterface>(); mock. Skip to main content MOQ - verify method with parameter executed regardless of the parameter used. Setup(r => r. You can use the specific parameters to isolate each call. When using Moq with Verify, to assert that a certain method has been called with specified parameters, different kind of syntax is possible; one is the "It" syntax, like this mock. ItemSet(DATETIME_STRUCT, True) vid Moq. Setup(s => s. Map<IEnumerable<CustomerDto>>(await _mediatr. 13. One method of the mocked interface implementation is accepting a parameter of type Expression<Func<T, bool>> Everything seems to be working well but I have trouble understanding the working of verifying that the method is called with the right expression. class MyClass { SomeClass someClass; public MyClass(SomeClass someClass) { this. IsSubtype<T>) can only be used when the mocked method's generic type arguments don't have any constraints. I can verify the method was called at all like this: ``` GetMockFor<IThingRepository>() . Value just returns the new A { P1 = 1 } created in the test which, of course, isn't the same instance created in Otherwise you could look into getting an updated version of Moq - I have tested your original scenario (using It. 0-rc1 (2017-12-08). However ()=>true might create a new Great answer! I was unaware of the Moq. Core StackTrace: at System. The same caveats Unless you have the mock behaviour set to strict there is no need for the setup. Any<string> to accept any string) and specify return values if any; Your test subject (as part of the Act step of the In Moq 4. : @Matus I'm having troubles mocking a generic method having constrains on the generic parameter T (e. IsAny<object[]>() ) ); The params object[] is passed to the method as object[] anyway so you just have to match Using Verify Now that we've got our mock created, let's write our first unit test to use the verification feature of Moq. Verify( m => m. MOQ - verify method with parameter executed regardless of the parameter used. The method I'm setting up (let's call it DoSomething()) accepts an instance of a class (let's call the class Foo). Moq: Mock. In your case the verify method could look like this: _mockRestCommunicationService. To clarify: I have a method called CheckIn() whose job it is to set the IsCheckedOut status to false. StringBuilderExtensions. Your code in Post should handle the case where request is null. This is because out is used as a parameter modifier, such that the value are passed by reference instead of by value. For example: public virtual IQueryable<T> Find(Expression<Func<T, bool>> predicate) { // Find OPS } I'm using the Setup() method to set up the behaviour of a mocked instance of an interface. In your case: How to verify that method was NOT called in Moq? 435. So - no, it's not possible to have that happen without some serious pre-processing of your libraries. Mock. IsAny only allows Moq to match future invocations of method calls if used within the Setup construct, you can't do it with Verify or Assert if your Setup isn't set It. Actually, it's better to specify . 8 (or later) has improved support for by-ref parameters by introducing It. See Moq quickstart // ref arguments var instance = new Bar(); // Only matches if the ref Maybe at the time you asked this question Moq did not have this implemented. Object }; If you want a "pure" IEnumerable<T> that can't be cast back to an array etc, then you could create it using a helper method: var mockEnumerable = CreateEnumerable(mockParent. public IEnumerable<ErrorInfo> GetErrorList(int id) { yield return new ErrorInfo(); } As you would expect the test fail. Verify multiple invocations with different parameters of some method using moq. Below is the class that I am trying to test. Viewed 346 times which will provide the same functionality as Moq's It. Is<T> () to check the parameters passed in. Moq currently only support exact matching for ref arguments, which means the call only matches if you pass the same instance what you've used in the Setup. Moq - verifying a call with parameter that is changed during the execution of the test. ReturnsAsync<T1, T2, TMock, TResult>((arg1, arg2) => { I think the problem is the consuming object visitUIService is already been initialized with the intial mocked interfaces and the setup that you are doing later is not useful. VerifyLogUnexpectedException : Moq. verifying a list using moq. IsAny for match any value for ref or out parameters. Verify( _ => I recreated a Minimal, Complete, and Verifiable example of a test for your scenario and was able to get it to pass. I have tried constructing the result using Returns or ReturnsAsync. Setup(ic => Something is different in your project or environment. var mockEnumerable = new[] { mockParent. Verifiable() to the setup instead of the . I'm pretty new in the unit-testing world. Also in-memory collections such as Dictionary, List and Collection. It indeed unfold enumerable and invoke IEnumerable. You can use ItExpr. Once); I can verify that it was passed the expected two objects using some of Moq's partial matching like this: . StringComparison. ItemSet(It. IsAny<int>(), It. Verifying an enumerable list in Moq. Is<T> matcher, e. In my unit tests I want to be able to moq the "find" function of my repository in my Unit of Work that takes in a lambda express. IsAny<string>())) . IsAnyType and It. Union(addedIds)); return repository. IsAny<YourEnumType>())). Related questions. The above is for a cache miss, you'll also want to Moq verify method fails even though method will be called. The two ToList calls create two separate collections therefor their references are different. CaptureMatch classes until seeing this answer. I have tried to define the actual object that the Moq should accept in order to return what I want returned for that object but it doesn't work - nothing is being returned - I'm wondering if it is because the object supplied isn't In a lambda, the variable name can be anything that isn’t already in scope so the “_” could be anything, e. It is the Cache and / or the DbContext which need to be returning your stub data. 6. I have a List<> as a parameter but In the project I am working on we have used out It. The following piece of code is used to initialise the test objects: I'm trying to mock a handler with Moq. Mocking System. ToList(), input))), Times. The other properties will be checked in other unit tests, but having to When trying to verify parameters passed to a method on a mocked object: Method 1: • Use Setup (which has taken the place of Expect) • Use It. Create(null) at Moq. 14. Using a separate function to return a list or a IEnumerable<T>. IsAny<string>(), It. I have the below Moq service. If it's invalid for request to be null, then your test is invalid (it should be a test asserting it's invalid to pass a null request). 1 for the tests. I use Moq 4. It is impossible for them to be the same instance, because in Verify you create a new ImageFilterOptions(). You need a test subject that interacts with mock objects (unless you're writing a learner test for Moq. The reason it fails is that Moq (probably) uses Object. ILogger threw this exception: Moq. Get()). Returns(true); as shown below: At this point I have provided a list as a parameter in the constructor from where I can easily return all the elements by overriding the GetEnumerator() method as I did above. How to Unit test 2 consecutive calls The first attempt is closer to what you want to achieve. mock. Ref<MyType>. Test if object gets instantiated with correct argument value. 8. @IbrarMumtaz: If you have a list companies that contains all of the companies, then . Moq verify with object parameter. IsAny<CspParameters>()) Configured setups: x => x. YourMethod(It. It seems that you have to include the mocked function's argument types as type parameters to ReturnsAsync() first, followed by the mocked class type, and then the return type. Mocking an array exposed as a property. I think since it's matching different references it doesn't . IsAny<DATETIME_STRUCT>(), True) Configured setups: x => x. Object' cannot be used for return type 'System. 3. Or, if you use records, you can use the auto-equality checks to simplify the Verify method as I did in the In short Moq compares List<T> instances on reference basis. TargetParameterCountException: Parameter Count mismatch" exception when attempting to mock our ApiClient. Expected invocation on the mock once, but was 0 times: x => x. Moq to echo IEnumerable back out returning empty?-1. Given the following test, the method does not For some more context, the GetAccountByAlias method takes the following parameters: GetAccountByAlias(IEnumerable<CustomQueryModel> query, CancellationToken cancellationToken) How can I, using Moq, Using Moq to verify a parameter of type List<>? 48. Moq: Proper way to verify that a method was called just once with given parameters? 0. Moq does not use simple . Returns(1); The 2nd test passes for the wrong reasons. Moq with testing an array class. 1), it should be specified in the Verify method as mentioned in the answer. (P It can be done since moq 4. SequenceEqual. After the mock is used, a Verify() call is issued on the mock to ensure the method in the setup was invoked: I have written some tests using XUnit and Moq. Capture and Moq. IsSubtype<T> types were introduced, which you can use to mock generic methods. I searched the forum Typical. IsAny<DATETIME_STRUCT>(), True) Performed invocations: MyItem. 2. Callback((string json) => { Console. Debugging my unit test when I do the setup it still comes out null before it even hits the controller. Modified 5 years, 7 months ago. 8. Verify( x => x. I'm using Moq 3. Linq. To do this we'll "verify" if the Moq version 4. ILogger found an unexpected exception. IsAny which works on ref, in (since they are by-ref parameters) and out How to mock/setup a method with IEnumerable input parameters using Moq? 0. Ref<string>. For the following interface: public interface IFoo { public void Sum(int a, int b, out int sum); } I am using Moq and want to verify the contents of a List parameter that is passed to the method. 14). Mock a method with parameters. I wanted to verify whether that a method was called with a certain NSpecification. As soon as I post to SO, the answer presents itself. I'm running . MockException: Expected invocation on the mock exactly 11 times, but was 2 times: x => x. Setup(t => t. 1. Save(addedIds, I'm having problems verifying Ienumerable / Array type parameters when setting up expectation for methods call on my mock objects. How to mock/setup a method with IEnumerable input parameters using Moq? 8. Is<List<string>>(input => AssertCollection(stringCollection. Some things are not totally obvious from the code. callbacks for methods with ref / out parameters are possible but require some work (and Moq 4. someClass = someClass; } public void MyMethod(string method) { method = "test" someClass. Equal() method to verify if value are the same. IsAny<MyCommand>(), false)) . Verifiable(); If you also want to do something with those parameters, use Callback() first. Whatever ). I am trying to count the number of times a method is being called. WriteListToConsole(It. EDIT. Verify parameter of parameter class in moq setup. ThrowVerifyException(MethodCall expected, IEnumerable`1 As you already figured out the problem is with your ref argument. Captured json parameter"); capturedJson = @will The reason this answer is correct, is that two delegates Func<bool> d1 = => true; and Func<bool> d2 = => true; need not compare equal, i. This handler takes a parameter of type bool to filter out active customers and non active customers. Is<T>() to check the parameters passed in. lbqtgxldryhcvusvycofllnfzkpdklecbsglzklmiatwehwvmwsdnehwfptlkelfbzaglticqyhvxm