Running tests using mouse bindings.

Default (Windows).sublime-mousemap

[
    { "button": "button3", "command": "execute_test_under_cursor" },
]

import sublime
import sublime_plugin

class ExecuteTestUnderCursorCommand(sublime_plugin.TextCommand):

    def run(self, edit, event):
        text_pos = self.view.window_to_text((event["x"], event["y"]))
        region = sublime.Region(text_pos, text_pos)
        line_number = self.view.rowcol(region.b)[0] + 1
        self.view.window().run_command("exec", {
            "shell_cmd": f"rspec {self.view.file_name()}:{line_number}"
        })

    def want_event(self):
        return True

This assumes that you want to run rspec <path_to_file>:<line_number> from the command line. The middle mouse button just helps in getting the line number.