Unit test Moq generic type

Question

I'm trying to test a method which returns an Interface with a generic type but I always get this error:

System.ArgumentException : Invalid callback. Setup on method with 0 parameter(s) cannot invoke callback with different number of parameters (1). at Moq.MethodCall.SetReturnsResponse g__ValidateCallback|27_0(Delegate callback)

Test method:

//Arrange Mock<IClientService> clientService = new Mock<IClientService>(); clientService .Setup(x => x.GetRabbitClient<AlertRequest>()) .Returns<IMessageQueueClient<AlertRequest>>(x => new Mock<IMessageQueueClient<AlertRequest>>().Object); //Act var client = clientService.Object.GetRabbitClient<AlertRequest>(); //Assert Assert.NotNull(client);

ClientService class:

public class ClientService : IClientService { /// <inheritdoc /> public IMessageQueueClient<TMessage> GetRabbitClient<TMessage>() where TMessage : class, new() { ServiceCollection serviceCollection = new ServiceCollection(); IConfigurationRoot configuration = new ConfigurationBuilder() .AddJsonFile("appsettings.json") .Build(); serviceCollection.UseMessageQueueOptions<RabbitMQSettings>(configuration); serviceCollection.UseMessageQueueFor<TMessage>(); var serviceProvider = serviceCollection.BuildServiceProvider(); return serviceProvider.GetRequiredService<IMessageQueueClient<TMessage>>(); } }

May be Object is a problem? You use .Object in Returns and in Act. Try delete .Object in Returns — Sasha
– Sasha, Commented Mar 5, 2020 at 8:07
I get this if I remove the Object in Returns : Cannot implicitly convert type 'Mock<IMessageQueueClient<AlertRequest>>' to 'IMessageQueueClient<TAlertRequest>'. An explicit conversion exists (are you missing a cast?) — Gun
– Gun, Commented Mar 5, 2020 at 8:11
Then move back .Object in returns in try this var client = clientService.GetRabbitClient<AlertRequest>(); — Sasha
– Sasha, Commented Mar 5, 2020 at 8:12

Sasha · Accepted Answer · 2020-03-05 08:18:55Z

ClientService is class under test, so you do not need to Mock it. I would do something like this:

//Arrange var clientService = new ClientService(); //Act var client = clientService.GetRabbitClient<AlertRequest>(); //Assert Assert.NotNull(client);

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