Implement dependency update checking.

https://trello.com/c/hK22Q2Bp/3-dependency-update-checker

.editorconfig

@@ -0,0 +1,11 @@
+# editorconfig.org
+root = true
+
+[*]
+indent_size = 2
+translate_tabs_to_spaces = true
+indent_style = spaces
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

Gemfile

@@ -5,4 +5,5 @@ gem "gemnasium-parser", "~> 0.1.9"
 group :development do
   gem "rspec", "~> 3.3.0"
   gem "rspec-its", "~> 1.2.0", require: "rspec/its"
+  gem 'webmock'
 end

Gemfile.lock

@@ -1,6 +1,9 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    addressable (2.3.8)
+    crack (0.4.2)
+      safe_yaml (~> 1.0.0)
     diff-lcs (1.2.5)
     gemnasium-parser (0.1.9)
     rspec (3.3.0)
@@ -19,6 +22,10 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.3.0)
     rspec-support (3.3.0)
+    safe_yaml (1.0.4)
+    webmock (1.21.0)
+      addressable (>= 2.3.6)
+      crack (>= 0.3.2)
 
 PLATFORMS
   ruby
@@ -27,6 +34,7 @@ DEPENDENCIES
   gemnasium-parser (~> 0.1.9)
   rspec (~> 3.3.0)
   rspec-its (~> 1.2.0)
+  webmock
 
 BUNDLED WITH
-   1.10.4
+   1.10.6

lib/bumper/update_checker/update_checker.rb

@@ -0,0 +1,32 @@
+# require "gem/version"
+require "net/http"
+require "json"
+
+module UpdateChecker
+
+  # checks for dependencies that are out of date
+  #
+  # usage:
+  #     UpdateChecker::RubyUpdateChecker.new(initial_dependencies).run
+  #
+  # dependencies, Array
+  # return an Array of dependencies that are out of date
+  class RubyUpdateChecker
+    def initialize(dependencies)
+      @dependencies = dependencies
+    end
+
+    def run
+      @dependencies.select do |dependency|
+        latest_version = get_latest(dependency)["version"]
+        Gem::Version.new(latest_version) > Gem::Version.new(dependency.version)
+      end
+    end
+
+    private
+
+    def get_latest(dependency)
+      JSON.parse(Net::HTTP.get(URI("https://rubygems.org/api/v1/gems/#{dependency.name}.json")))
+    end
+  end
+end

spec/bumper/file_parsers/ruby_file_parser_spec.rb

@@ -3,7 +3,7 @@
 require "bumper/file_parsers/ruby_file_parser"
 
 RSpec.describe FileParsers::RubyFileParser do
-  let(:gemfile) { File.read('spec/fixtures/Gemfile') }
+  let(:gemfile) { File.read("spec/fixtures/Gemfile") }
   let(:parser) { FileParsers::RubyFileParser.new(gemfile) }
   subject(:dependencies) { parser.parse }
 

spec/bumper/update_checker/update_checker_spec.rb

@@ -0,0 +1,63 @@
+require "spec_helper"
+require "bumper/dependency"
+require "bumper/update_checker/update_checker"
+
+RSpec.describe UpdateChecker::RubyUpdateChecker do
+  let(:outdated_dependency) {
+    File.read("spec/fixtures/out_of_date_dependency_response.json")
+  }
+
+  let(:outdated_dependency_json) {
+    JSON.parse(outdated_dependency)
+  }
+
+  let(:latest_dependency) {
+    File.read("spec/fixtures/up_to_date_dependency_response.json")
+  }
+
+  let(:latest_dependency_json) {
+    JSON.parse(latest_dependency)
+  }
+
+  before do
+    stub_request(
+      :get,
+      "https://rubygems.org/api/v1/gems/#{outdated_dependency_json["name"]}.json"
+    ).
+    to_return(:status => 200, :body => outdated_dependency, :headers => {})
+
+    stub_request(
+        :get,
+        "https://rubygems.org/api/v1/gems/#{latest_dependency_json["name"]}.json"
+      ).
+      to_return(:status => 200, :body => latest_dependency, :headers => {})
+  end
+
+  # TODO: tests need mocking
+  let(:initial_dependencies) do
+    [
+      Dependency.new(
+        name: latest_dependency_json["name"],
+        version: latest_dependency_json["version"]
+      ),
+      Dependency.new(
+        name: outdated_dependency_json["name"],
+        version: "1.2.0"
+      )
+    ]
+  end
+
+  let(:checker) { UpdateChecker::RubyUpdateChecker.new(initial_dependencies) }
+  subject(:dependencies) { checker.run }
+
+  its(:length) { is_expected.to eq(1) }
+
+  describe "the first dependency" do
+    subject { dependencies.first }
+
+    it { is_expected.to be_a(Dependency) }
+    its(:name) { is_expected.to eq(outdated_dependency_json["name"]) }
+    its(:version) { is_expected.to eq("1.2.0") }
+  end
+
+end

spec/fixtures/out_of_date_dependency_response.json

@@ -0,0 +1,67 @@
+{
+  "name": "outdated",
+  "downloads": 54431629,
+  "version": "1.2.3",
+  "version_downloads": 341108,
+  "platform": "ruby",
+  "authors": "David Heinemeier Hansson",
+  "info": "Ruby on Rails is a full-stack web framework optimized for programmer happiness and sustainable productivity. It encourages beautiful code by favoring convention over configuration.",
+  "licenses": [
+    "MIT"
+  ],
+  "metadata": {},
+  "sha": "1c33dd7c280d1c5dc4235509f774d673bac1d3f2e8c53b1353f677e7578ffc5a",
+  "project_uri": "https://rubygems.org/gems/rails",
+  "gem_uri": "https://rubygems.org/gems/rails-4.2.4.gem",
+  "homepage_uri": "http://www.rubyonrails.org",
+  "wiki_uri": "http://wiki.rubyonrails.org",
+  "documentation_uri": "http://api.rubyonrails.org",
+  "mailing_list_uri": "http://groups.google.com/group/rubyonrails-talk",
+  "source_code_uri": "http://github.com/rails/rails",
+  "bug_tracker_uri": "http://github.com/rails/rails/issues",
+  "dependencies": {
+    "development": [],
+    "runtime": [
+      {
+        "name": "actionmailer",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "actionpack",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "actionview",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "activejob",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "activemodel",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "activerecord",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "activesupport",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "bundler",
+        "requirements": "< 2.0, >= 1.3.0"
+      },
+      {
+        "name": "railties",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "sprockets-rails",
+        "requirements": ">= 0"
+      }
+    ]
+  }
+}

spec/fixtures/up_to_date_dependency_response.json

@@ -0,0 +1,67 @@
+{
+  "name": "latest",
+  "downloads": 54431629,
+  "version": "4.2.4",
+  "version_downloads": 341108,
+  "platform": "ruby",
+  "authors": "David Heinemeier Hansson",
+  "info": "Ruby on Rails is a full-stack web framework optimized for programmer happiness and sustainable productivity. It encourages beautiful code by favoring convention over configuration.",
+  "licenses": [
+    "MIT"
+  ],
+  "metadata": {},
+  "sha": "1c33dd7c280d1c5dc4235509f774d673bac1d3f2e8c53b1353f677e7578ffc5a",
+  "project_uri": "https://rubygems.org/gems/rails",
+  "gem_uri": "https://rubygems.org/gems/rails-4.2.4.gem",
+  "homepage_uri": "http://www.rubyonrails.org",
+  "wiki_uri": "http://wiki.rubyonrails.org",
+  "documentation_uri": "http://api.rubyonrails.org",
+  "mailing_list_uri": "http://groups.google.com/group/rubyonrails-talk",
+  "source_code_uri": "http://github.com/rails/rails",
+  "bug_tracker_uri": "http://github.com/rails/rails/issues",
+  "dependencies": {
+    "development": [],
+    "runtime": [
+      {
+        "name": "actionmailer",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "actionpack",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "actionview",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "activejob",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "activemodel",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "activerecord",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "activesupport",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "bundler",
+        "requirements": "< 2.0, >= 1.3.0"
+      },
+      {
+        "name": "railties",
+        "requirements": "= 4.2.4"
+      },
+      {
+        "name": "sprockets-rails",
+        "requirements": ">= 0"
+      }
+    ]
+  }
+}

spec/spec_helper.rb

@@ -1 +1,2 @@
 require "rspec/its"
+require "webmock/rspec"