Testing basic Sinatra app with rspec and capybara

Gemfile

source 'https://rubygems.org'
ruby '2.1.0'

gem 'rspec', '~> 2.14.0'
gem 'capybara'
gem 'pry-debugger', '~> 0.2.2'
gem 'sinatra'
gem 'sinatra-contrib' # Not required
gem 'thin' # Not required
gem 'rack-test'

server_spec.rb

require 'spec_helper'

describe "Sinatra App" do
  context 'Visiting the home page' do

    before (:each) do
      # Visit root before each test
      visit('/')
    end

    context 'Visiting Nav Links' do

      specify 'Projects link should go to Projects page' do
        # Find the a tag on the page named Projects. Case sensitive
        click_link('Projects')
        
        # After clicking link we should be on the /projects page
        # The project page has an h1 Create New Project
        expect(page).to have_content('Create New Project')
      end

      specify 'Tasks link should go to Tasks page' do
        click_link('Tasks')
        expect(page).to have_content('Create New Task')
      end

      specify 'Employees link should to Employees page' do
        click_link('Employees')
        expect(page).to have_content('Create New Employee')
      end
    end

  end

spec_helper.rb

# spec_helper.rb

require './lib/task-manager.rb'
require './lib/server.rb'
require 'rspec'
require 'rack/test'
require 'capybara/rspec'

ENV['RACK_ENV'] = 'test'

# Mixin for testing sinatra

module RSpecMixin
  include Rack::Test::Methods
  def app
    Sinatra::Application
  end
  Capybara.app = Sinatra::Application.new
end

RSpec.configure do |config|
  # Configure each test to always use a new singleton instance
  config.before(:each) do
    TM.instance_variable_set(:@__db_instance, nil)
  end

  config.include RSpecMixin
  config.include Capybara::DSL
end

Capybara.configure do |config|
  config.include RSpecMixin
end