RSpec Tags provide an easy way to run specific tests in your spec files. By default, RSpec will run all tests in the spec files that it runs, but you might only need to run a subset of them. Let’s say that you have some tests that run very quickly and that you’ve just made a change to your application code and you want to just run the quick tests, this code will demonstrate how to do that with RSpec Tags.

describe "How to run specific Examples with Tags" do 
   it ''is a slow test'', :slow = > true do 
      sleep 10 
      puts ''This test is slow!'' 
   end 
   
   it ''is a fast test'', :fast = > true do 
      puts ''This test is fast!'' 
   end 
end

Now, save the above code in a new file called tag_spec.rb. From the command line, run this command: rspec –tag slow tag_spec.rb

You will see this output −

Run options: include {: slow = >true}

This test is slow! 
. 
Finished in 10 seconds (files took 0.11601 seconds to load) 
1 example, 0 failures

Then, run this command: rspec –tag fast tag_spec.rb

You will see this output −

Run options: include {:fast = >true} 
This test is fast! 
. 
Finished in 0.001 seconds (files took 0.11201 seconds to load) 
1 example, 0 failures

As you can see, RSpec Tags makes it very easy to a subset of tests!