Examples of custom assertions for remote conections with MiniTest

gistfile1.md

This is a short and simple example of custom assertions for Minitest.

They are very basic, but they help me to learn it. And I can use the to test some very simple use case of remote conection without install a bunch of gems.

I learn what I needed for this from this article and the minitest-chef-handler's code.

It can be improved a lot using Nokogiri and other Ruby libraries.

web_assertions.rb

require 'minitest/autorun'
require 'net/http'

module MiniTest
  class Web
    attr_reader :server, :response, :status_code, :body
      
    def initialize(host='http://localhost')
      @host = host
      @response = nil
      @body = "" 
      @status_code = 0
    end
    
    def visit(path='/')
      uri = URI("#{@host}#{path}")
      response = Net::HTTP.get_response(uri)
      @response = response
      @status_code = response.code
      @body = response.body
    end
  end
end


module MiniTest::Assertions
  def assert_status_code connection, status_code
    assert connection.status_code == status_code, "Expected HTTP status code #{status_code}, but it was #{connection.status_code}"
  end
  def refute_status_code connection, status_code
    refute connection.status_code == status_code, "Expected HTTP status code not to be #{status_code}, but it was #{connection.status_code}"
  end
end


module MiniTest::Expectations
  MiniTest::Web.infect_an_assertion :assert_status_code, :must_have_status_code, :dont_flip
  MiniTest::Web.infect_an_assertion :refute_status_code, :wont_have_status_code, :dont_flip
end

web_stuff_test.rb

require_relative 'web_assertions'
        
describe "Web stuff" do

  describe "Visit the home" do
    before do 
      @site = Minitest::Web.new('http://www.google.es')
      @site.visit 
    end

    let(:connection) { @site }
    let(:body) { @site.body }

    it { connection.must_have_status_code "200" }
    it { body.must_match /<title>Google<\/title>/ }
  end

  describe "Visit the redirection page" do
    before do
      @site = Minitest::Web.new('http://www.google.com')
      @site.visit
    end
    let(:connection) { @site }
    let(:body) { @site.body }

    it { connection.wont_have_status_code "200" }
    it { connection.must_have_status_code "302" }
    it { body.wont_match /<title>Google<\/title>/ }
  end

end