title: How do I run an RSpec test on a specific line?
body: <p>I have next spec file:</p>
  
  <pre><code>require 'rails_helper'
  
  describe Order do
    it "calculates the total price of the order" do
      item1 = create(:item)
      item2 = create(:item, price: 20)
  
      order = create(:order)
      order.items &lt;&lt; item1
      order.items &lt;&lt; item2
  
      order.calculate_total
      expect(order.total).to eq(30)
    end
  
    it "raises exception if order has no items in it" do
      expect { create(:order) }.to raise_exception
    end
  end
  </code></pre>
  
  <p>And I want to run test from 16 line (not entire test), so I type:</p>
  
  <pre><code>rspec spec/models/orders_spec.rb -l16
  </code></pre>
  
  <p>Instead of get running test, i get next error:</p>
  
  <pre><code>invalid option: -l18
  </code></pre>
  
  <p>How to run test from a certain line?</p>