CODEWITHSUNDEEP
c#unit-testingmocking
Kaung Zan
Kaung Zan

Reputation: 11

Fakes does not exist in the namespace System C#

I am writing a mock testing for a C# .NET Core version 8 project with MSTesting. The library uses static methods that I want to fake in my test project. I found online about using Moles (shims) with the following syntax:

using Microsoft.QualityTools.Testing.Fakes;
using (ShimsContext.Create())
{
    System.Fakes.ShimDateTime.NowGet = () => new DateTime(1837, 1, 1);
    ^^^^^^^^^^^^
    Error
}

However, I can't figure out (after reading the documentation and other posts) how to add Fakes to System.Runtime.

Many instruction says in Visual Studio, you do Add > Add Fakes to the project assembly, but no further instruction. But I don't find this option at all. How to use System.Fakes in .NET Core MSTest project to fake static methods, if there is no way, is there an alternative way to make a mock tests on this?

Upvotes: 1

Views: 344

Answers (1)

Peter Csala
Peter Csala

Reputation: 22849

If memory serves well then Fakes was popular around a decade ago (Visual Studio 2012 and 2015 era).

Since then a lot of things happened to .Net and there are proprietary (like JustMock) and open-source alternatives (like Pose):

using Pose;

Shim dateTimeShim = Shim.Replace(() => DateTime.Now).With(() => new DateTime(2004, 4, 4));

It has limitations but I think it's worth a try. Also worth mentioning that JustMock have a free Lite edition as well.

Upvotes: 2

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