The easiest way to install mjolnir-plugin-tester is to run cargo install --git=https://github.com/CentauriSolutions/mjolnir-plugin-tester.git mjolnir-plugin-tester on a machine with the rust toolchain installed.
The plugin tester can be configured as shows in the examples. It should then be run as mjolnir-plugin-tester --config=/path/to/config.toml and will then validate that the plugin can be registered, instantiated, and run correctly with an arbitrary alert.
It can also be called with the -q, or --quick option to only validate the registration., Please note that sending the -q will not cause the plugin to actually be called, and should only be used for very basic validation. If you want to ensure that your plugin will actually do something with the alert, the tester should be run without additional arguments.