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I'm trying to use NSubstitute in my Unity project (Unity version 2019.2.2f1). No matter how to import it, my IDE, both Visual Studio and JetBrains Rider, would give an error when I try using NSubstitute saying NSubstitute is undefined.

I have tried many options and versions of NSubstitute packages (4.2.1 and 2.0.3). I also import the dll file from net35 folder of the package into a Plugins folder in my Unity project. I also tried to install the same version of NSubstitute using Nuget in the IDE.

Dendi Maniac
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2 Answers2

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I added NSubstitute 4.2.1 (.NET Standard 2.0) in a Unity project, but I needed to include 3 more dependencies for it to work:

  1. system.threading.tasks.extensions.4.5.3
  2. system.runtime.compilerservices.unsafe.4.6.0
  3. castle.core.4.4.0
Amal K
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Rodrigo Eleuterio
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  • worked for me! thanks! this shoud be the anwser! why using an old version – Chakalaka May 10 '21 at 19:07
  • In 2018 the newer versions didn't work. But since this works, you should definitely go with the new version. Upvoted this one and added some reference in my answer to this one. – Jan Thomä Jun 16 '21 at 14:13
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Update 2020

If you read this in 2020 or later, check the answer from Rodrigo Eleuterio how to make this work with the latest version of NSubstitute.

/end update

I was able to make the 2.0.3 version work with Unity. The newer versions have additional dependencies which I could not make work in Unity, so it seems for now we're stuck with 2.0.3. So here is how I did it:

  • Download 2.0.3 from the NuGet Website.
  • Unzip the file and move the lib/net35/NSubstitute.dll into the Plugins folder of your project.
  • In your test assembly definition, don't forget to reference it, otherwise it will not be found.

enter image description here

When you now reopen the project in Rider it should be found. Sometimes Unity acts up a little and doesn't seem to find the DLL. In this case re-importing the project can help.

Jan Thomä
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