TestFailure due to Circular Dependency in a Service Layer with Entity Framework Core
I'm not sure how to approach I'm working with an scenario while trying to unit test a service method in my ASP.NET Core application that accesses a repository using Entity Framework Core 5.0... The service relies on another service, which in turn relies on the first service, creating a circular dependency. When I run my tests, I get the following behavior: `System.InvalidOperationException: The service 'MyApp.Services.ISomeService' want to be resolved because it has a circular dependency.` Here’s a simplified version of the relevant code: ```csharp // ISomeService.cs public interface ISomeService { Task<string> GetDataAsync(); } // SomeService.cs public class SomeService : ISomeService { private readonly IOtherService _otherService; public SomeService(IOtherService otherService) { _otherService = otherService; } public async Task<string> GetDataAsync() { return await _otherService.GetOtherDataAsync(); } } // IOtherService.cs public interface IOtherService { Task<string> GetOtherDataAsync(); } // OtherService.cs public class OtherService : IOtherService { private readonly ISomeService _someService; public OtherService(ISomeService someService) { _someService = someService; } public Task<string> GetOtherDataAsync() { return Task.FromResult("Data from OtherService"); } } ``` In my unit test, I am trying to mock `IOtherService` and verify the behavior of `SomeService`. However, the circular dependency is breaking the test setup. I have tried refactoring the code to use a different design pattern, but it seems complex and I'm unsure how to proceed without creating a poor architecture. Is there a recommended way to handle this circular dependency in unit tests, or should I consider redesigning the services to avoid this pattern altogether? I'm working on a API that needs to handle this. Thanks in advance! This is for a desktop app running on macOS. I'd really appreciate any guidance on this.