NUnit and Moq: Difficulty isolating a method in a static class for unit testing
I'm deploying to production and I'm working through a tutorial and I'm stuck trying to I've been struggling with this for a few days now and could really use some help... I'm trying to unit test a method that depends on a static utility class, and I'm working with important scenarios with mocking. The method under test is as follows: ```csharp public class MyService { public string ProcessData(string input) { return StaticUtilityClass.GetProcessedData(input); } } ``` The `StaticUtilityClass` looks something like this: ```csharp public static class StaticUtilityClass { public static string GetProcessedData(string input) { // Simulate some complex processing return input.ToUpper(); } } ``` I want to isolate `ProcessData` from `StaticUtilityClass` but since it’s static, I need to mock it using Moq, which leads to tight coupling and makes my tests less reliable. I tried to refactor `StaticUtilityClass` into an interface, but that would mean a lot of changes across my codebase. I also looked into using `Microsoft Fakes` and `JustMock`, but my team prefers sticking with NUnit and Moq due to our existing standards. What approaches can I use to effectively unit test `MyService.ProcessData` without directly invoking the static method? Is there a recommended design pattern or testing strategy to overcome this limitation? Any insights or examples would be greatly appreciated! My current setup includes NUnit 3.12 and Moq 4.16. This is part of a larger CLI tool I'm building. I'd really appreciate any guidance on this. Any ideas what could be causing this? I'm open to any suggestions. I'm working on a microservice that needs to handle this.