Add integration tests for deploy task

This commit adds the outlines of a testing framework for Cap tasks.
Currently just the `cap install` and `cap deploy` tasks are covered. For
now, these tests can only be run if it is `ssh localhost` will work for
you and are currently excluded from the suite. It is my intention to
eventually replace the `sshkit` backend with a test backend, but for now
this is good enough to prevent simple regressions.

spec/integration/deploy_finalize_spec.rb

@@ -0,0 +1,34 @@
+require 'integration_spec_helper'
+
+describe 'cap deploy:finished', slow: true do
+  before do
+    install_test_app_with(config)
+  end
+
+  describe 'deploy' do
+    let(:config) {
+      %{
+        set :stage, :#{stage}
+        set :deploy_to, '#{deploy_to}'
+        set :repo, 'git://github.com/capistrano/capistrano.git'
+        set :branch, 'v3'
+        server 'localhost', roles: %w{web app}, user: '#{current_user}'
+        set :linked_files, %w{config/database.yml}
+        set :linked_dirs, %w{bin log public/system vendor/bundle}
+        }
+    }
+
+    describe 'log_revision' do
+      before do
+        cap 'deploy:started'
+        cap 'deploy:update'
+        cap 'deploy:finalize'
+        cap 'deploy:finished'
+      end
+
+      it 'writes the log file' do
+        expect(deploy_to.join('revisions.log')).to be_a_file
+      end
+    end
+  end
+end

spec/integration/deploy_finished_spec.rb

@@ -0,0 +1,36 @@
+require 'integration_spec_helper'
+
+describe 'cap deploy:finished', slow: true do
+  before do
+    install_test_app_with(config)
+  end
+
+  describe 'deploy' do
+    let(:config) {
+      %{
+        set :stage, :#{stage}
+        set :deploy_to, '#{deploy_to}'
+        set :repo, 'git://github.com/capistrano/capistrano.git'
+        set :branch, 'v3'
+        server 'localhost', roles: %w{web app}, user: '#{current_user}'
+        set :linked_files, %w{config/database.yml}
+        set :linked_dirs, %w{bin log public/system vendor/bundle}
+        }
+    }
+
+    describe 'symlink' do
+      before do
+        cap 'deploy:started'
+        cap 'deploy:update'
+        cap 'deploy:finalize'
+      end
+
+      describe 'release' do
+        it 'symlinks the release to `current`' do
+          expect(File.symlink?(current_path)).to be_true
+          expect(File.readlink(current_path)).to match /\/tmp\/test_app\/deploy_to\/releases\/\d{14}/
+        end
+      end
+    end
+  end
+end

spec/integration/deploy_started_spec.rb

@@ -0,0 +1,74 @@
+require 'integration_spec_helper'
+
+describe 'cap deploy:started', slow: true do
+  before do
+    install_test_app_with(config)
+  end
+
+  describe 'deploy:check' do
+    let(:config) {
+      %{
+        set :stage, :#{stage}
+        set :deploy_to, '#{deploy_to}'
+        set :repo, 'git://github.com/capistrano/capistrano.git'
+        set :branch, 'v3'
+        server 'localhost', roles: %w{web app}, user: '#{current_user}'
+        set :linked_files, %w{config/database.yml}
+        set :linked_dirs, %w{bin log public/system vendor/bundle}
+      }
+    }
+
+    describe 'directories' do
+      before do
+        cap 'deploy:check:directories'
+      end
+
+      it 'ensures the directory structure' do
+        expect(shared_path).to be_a_directory
+        expect(releases_path).to be_a_directory
+      end
+    end
+
+    describe 'linked_dirs' do
+      before do
+        cap 'deploy:check:linked_dirs'
+      end
+
+      it 'ensure directories to be linked in `shared`' do
+        [
+          shared_path.join('bin'),
+          shared_path.join('log'),
+          shared_path.join('public/system'),
+          shared_path.join('vendor/bundle'),
+        ].each do |dir|
+          expect(dir).to be_a_directory
+        end
+      end
+    end
+
+    describe 'linked_files' do
+
+      subject { cap 'deploy:check:linked_files' }
+
+      context 'file does not exist' do
+        it 'fails' do
+          expect(subject).to match 'config/database.yml does not exist'
+        end
+      end
+
+      context 'file exists' do
+        before do
+          create_shared_directory('config')
+          create_shared_file('config/database.yml')
+        end
+
+        it 'suceeds' do
+          expect(subject).not_to match 'config/database.yml does not exist'
+          expect(subject).to match 'successful'
+        end
+
+      end
+    end
+  end
+end
+

spec/integration/deploy_update_spec.rb

@@ -0,0 +1,45 @@
+require 'integration_spec_helper'
+
+describe 'cap deploy:update', slow: true do
+  before do
+    install_test_app_with(config)
+  end
+
+  describe 'deploy' do
+    let(:config) {
+      %{
+        set :stage, :#{stage}
+        set :deploy_to, '#{deploy_to}'
+        set :repo, 'git://github.com/capistrano/capistrano.git'
+        set :branch, 'v3'
+        server 'localhost', roles: %w{web app}, user: '#{current_user}'
+        set :linked_files, %w{config/database.yml}
+        set :linked_dirs, %w{bin log public/system vendor/bundle}
+        }
+    }
+
+    describe 'symlink' do
+      before do
+        cap 'deploy:started'
+        create_shared_directory('config')
+        create_shared_file('config/database.yml')
+        cap 'deploy:symlink:shared'
+      end
+
+      describe 'linked_dirs' do
+        it 'symlinks the directories in shared to `current`' do
+          %w{bin log public/system vendor/bundle}.each do |dir|
+            expect(release_path.join(dir)).to be_a_symlink_to shared_path.join(dir)
+          end
+        end
+      end
+
+      describe 'linked_files' do
+        it 'symlinks the files in shared to `current`' do
+          file = 'config/database.yml'
+          expect(release_path.join(file)).to be_a_symlink_to shared_path.join(file)
+        end
+      end
+    end
+  end
+end

spec/integration/dsl_spec.rb

@@ -13,6 +13,14 @@ describe Capistrano::DSL do
         dsl.server 'example4.com', roles: %w{app}, primary: true
       end
 
+      describe 'fetching all servers' do
+        subject { dsl.roles(:all) }
+
+        it 'returns all servers' do
+          expect(subject.map(&:hostname)).to eq %w{example1.com example2.com example3.com example4.com}
+        end
+      end
+
       describe 'fetching servers by role' do
         subject { dsl.roles(:app) }
 
@@ -64,6 +72,14 @@ describe Capistrano::DSL do
         dsl.role :app, %w{example4.com}, primary: true
       end
 
+      describe 'fetching all servers' do
+        subject { dsl.roles(:all) }
+
+        it 'returns all servers' do
+          expect(subject.map(&:hostname)).to eq %w{example1.com example2.com example3.com example4.com}
+        end
+      end
+
       describe 'fetching servers by role' do
         subject { dsl.roles(:app) }
 

spec/integration/installation_spec.rb

@@ -1,9 +1,6 @@
-require 'spec_helper'
-require 'support/test_app'
+require 'integration_spec_helper'
 
-include TestApp
-
-describe 'cap install' do
+describe 'cap install', slow: true do
 
   context 'with defaults' do
     before :all do
@@ -65,7 +62,7 @@ describe 'cap install' do
         expect(File.exists?(file)).to be_true
       end
 
-      it 'creates the stage files' do
+      it 'creates the stage files specified, not the defaults' do
         qa = test_app_path.join('config/deploy/qa.rb')
         production = test_app_path.join('config/deploy/production.rb')
         staging = test_app_path.join('config/deploy/staging.rb')

spec/integration_spec_helper.rb

@@ -0,0 +1,7 @@
+require 'spec_helper'
+require 'support/test_app'
+require 'support/matchers'
+
+include TestApp
+
+

spec/spec_helper.rb

@@ -9,6 +9,8 @@ require 'mocha/api'
 Dir['#{File.dirname(__FILE__)}/support/**/*.rb'].each {|f| require f}
 
 RSpec.configure do |config|
+  config.treat_symbols_as_metadata_keys_with_true_values = true
   config.mock_framework = :mocha
   config.order = 'random'
+  config.filter_run_excluding :slow
 end

spec/support/matchers.rb

@@ -0,0 +1,5 @@
+RSpec::Matchers.define :be_a_symlink_to do |expected|
+  match do |actual|
+    File.identical?(expected, actual)
+  end
+end

spec/support/test_app.rb

@@ -1,7 +1,10 @@
+require 'fileutils'
 module TestApp
   def create_test_app
-    FileUtils.rm_rf(test_app_path)
-    FileUtils.mkdir(test_app_path)
+    [test_app_path, deploy_to].each do |path|
+      FileUtils.rm_rf(path)
+      FileUtils.mkdir(path)
+    end
 
     File.open(gemfile, 'w+') do |file|
       file.write "gem 'capistrano', path: '#{path_to_cap}'"
@@ -12,11 +15,66 @@ module TestApp
     end
   end
 
+  def install_test_app_with(config)
+    create_test_app
+    Dir.chdir(test_app_path) do
+      %x[bundle exec cap install STAGES=#{stage}]
+    end
+    write_local_deploy_file(config)
+  end
+
+  def write_local_deploy_file(config)
+    File.open(test_stage_path, 'w') do |file|
+      file.write config
+    end
+  end
+
+  def create_shared_directory(path)
+    FileUtils.mkdir_p(shared_path.join(path))
+  end
+
+  def create_shared_file(path)
+    File.open(shared_path.join(path), 'w')
+  end
+
+  def cap(task)
+    Dir.chdir(test_app_path) do
+      %x[bundle exec cap #{stage} #{task}]
+    end
+  end
+
+  def stage
+    'test'
+  end
+
+  def test_stage_path
+    test_app_path.join('config/deploy/test.rb')
+  end
 
   def test_app_path
     Pathname.new('/tmp/test_app')
   end
 
+  def deploy_to
+    Pathname.new('/tmp/test_app/deploy_to')
+  end
+
+  def shared_path
+    deploy_to.join('shared')
+  end
+
+  def current_path
+    deploy_to.join('current')
+  end
+
+  def releases_path
+    deploy_to.join('releases')
+  end
+
+  def release_path
+    releases_path.join(Dir.entries(releases_path).last)
+  end
+
   def path_to_cap
     File.expand_path('.')
   end
@@ -24,4 +82,8 @@ module TestApp
   def gemfile
     test_app_path.join('Gemfile')
   end
+
+  def current_user
+    `whoami`.chomp
+  end
 end