Alternatively if you're using .NET Core then you can install Shouldly via the command line interface with the following command:
dotnet add package Shouldly
Contributions to Shouldly are very welcome. For guidance, please see CONTRIBUTING.md
Prerequisites for running on build server
Shouldly uses the source code to make its error messages better. Hence, on the build server you will need to have the "full" pdb files available where the tests are being run.
What is meant by "full" is that when you set up your "release" configuration in Visual Studio and you go to Project Properties > Build > Advanced > Debug, you should set it to "full" rather than "pdb-only".