Issue Running NUnit Tests On Jenkins
Provided you are getting to the third line without error I would suggest it should be:
nunit3-console.exe <workspace_relative_path_to_project_containing_tests>.dllDisclaimer: I am contributor to the NUnit project and author of the Saucery3 nuget package. But I am not a mono expert.
I encountered exactly the same problem when I tried run NUnit-console (using Mono on MacOS) over an SSH connection. In my case executing source /etc/profile; command before running it resolved the problem.
ssh user@host source /etc/profile; {MonoPath}/mono {NUnitPath}/nunit3-console.exe {TestsPath}/Test.dll