No tests were found

I recently installed RubyMine in my Mac and I am trying to run test cases present in my project by right clicking on the *_spec.rb file and using "Run 'RSpec:...."  option .  But I get the message "no tests were found" . 

I am able to run my test cases from RubyMine terminal and from my Mac terminal but not by the option provided by RubyMine ( like explained above)

Can some one please suggest what could be the issue ? 

My config is : 

• Ruby 2.3.3
• Rails 4.2.11.1
• RubyMine 2020.3.2

Please see I have recently started learning Ruby , so if you can breifly describe to a newbie it will be great.

Thanks