rspec how to run a single test?

I have found all kinds of links online but none that are current and show how to run a single test.

I have the following file:

/spec/controllers/groups_controller_spec.rb

What command in terminal do I use to run just that spec and in what dir do I run the command?

My gem file:

# Test ENVIRONMENT GEMS
group :development, :test do
    gem "autotest"
    gem "rspec-rails", "~> 2.4"
    gem "cucumber-rails", ">=0.3.2"
    gem "webrat", ">=0.7.2"
    gem 'factory_girl_rails'
    gem 'email_spec'
end

spec file

require 'spec_helper'

describe GroupsController do
  include Devise::TestHelpers

  describe "GET yourgroups" do
    it "should be successful and return 3 items" do

      Rails.logger.info 'HAIL MARRY'

      get :yourgroups, :format => :json
      response.should be_success
      body = JSON.parse(response.body)
      body.should have(3).items # @user1 has 3 permissions to 3 groups
    end
  end
end

---

Usually I do:

rspec ./spec/controllers/groups_controller_spec.rb:42

Where 42 represents the line of the test I want to run.

EDIT1:

You could also use tags. See here.

EDIT 2:

Try:

bundle exec rspec ./spec/controllers/groups_controller_spec.rb:42

---

With Rake:

rake spec SPEC=path/to/spec.rb

(Credit goes to this answer. Go vote him up.)

EDIT (thanks to @cirosantilli): To run one specific scenario within the spec, you have to supply a regex pattern match that matches the description.

rake spec SPEC=path/to/spec.rb 
          SPEC_OPTS="-e "should be successful and return 3 items""

---

你可以通过一个正则表达式来规范命令将只运行it匹配您提供的名称块。

spec path/to/my_spec.rb -e "should be the correct answer"

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