title: Test only one it or describe with Rspec
body: <p>On TestUnit you can launch one test in file with -n option</p>
  
  <p>for example </p>
  
  <pre><code>require 'test_helper'
  
  class UserTest &lt; ActiveSupport::TestCase
  
    test "the truth" do
      assert true
    end
  
    test "the truth 2" do
      assert true
    end
  
  end
  </code></pre>
  
  <p>You can execute only the test the truth</p>
  
  <pre><code>ruby -Itest test/unit/user_test.rb -n test_the_truth
  </code></pre>
  
  <p>The ouput</p>
  
  <pre><code>1 tests, 1 assertions, 0 failures, 0 errors, 0 skip
  </code></pre>
  
  <p>How can that with rspec ?</p>
  
  <p>The command seem not work</p>
  
  <pre><code>rspec spec/models/user_spec.rb -e "User the truth"
  </code></pre>