This is a sample project for running mocha tests remotely via ssh with Mocha Test Explorer. It uses the ssh launcher script from https://github.com/hbenl/mocha-explorer-launcher-scripts.
To run the tests in this sample project, you will need a machine that has node and rsync installed and that you can ssh into without being prompted for a password. Change the SSH_HOST, SSH_USER and SSH_WORKSPACE_PATH environment variables in .vscode/settings.json (SSH_WORKSPACE_PATH should point to an empty directory on the remote host where this workspace will be copied to), then you should be able to run the tests using Mocha Test Explorer.
If it doesn't work, have a look at the diagnostic log to see why it fails.