Update existing generator specs.

This updates the existing generator specs:

- Remove old `require 'spec_helper'`; `.rspec` does this now
- Do not use the monkey patch version of `describe`
- Use the generator support macros for the shared common setup

spec/generators/rspec/controller/controller_generator_spec.rb

@@ -1,13 +1,9 @@
-require 'spec_helper'
-
 # Generators are not automatically loaded by Rails
 require 'generators/rspec/controller/controller_generator'
+require 'support/generators'
 
-describe Rspec::Generators::ControllerGenerator, :type => :generator do
-  # Tell the generator where to put its output (what it thinks of as Rails.root)
-  destination File.expand_path("../../../../../tmp", __FILE__)
-
-  before { prepare_destination }
+RSpec.describe Rspec::Generators::ControllerGenerator, :type => :generator do
+  setup_default_destination
 
   describe 'controller specs' do
     subject { file('spec/controllers/posts_controller_spec.rb') }

spec/generators/rspec/feature/feature_generator_spec.rb

@@ -1,13 +1,9 @@
-require 'spec_helper'
-
 # Generators are not automatically loaded by rails
 require 'generators/rspec/feature/feature_generator'
+require 'support/generators'
 
-describe Rspec::Generators::FeatureGenerator, :type => :generator do
-  # Tell the generator where to put its output (what it thinks of as Rails.root)
-  destination File.expand_path('../../../../../tmp', __FILE__)
-
-  before { prepare_destination }
+RSpec.describe Rspec::Generators::FeatureGenerator, :type => :generator do
+  setup_default_destination
 
   describe 'feature specs' do
     describe 'are generated independently from the command line' do

spec/generators/rspec/helper/helper_generator_spec.rb

@@ -1,13 +1,9 @@
-require 'spec_helper'
-
 # Generators are not automatically loaded by Rails
 require 'generators/rspec/helper/helper_generator'
+require 'support/generators'
 
-describe Rspec::Generators::HelperGenerator, :type => :generator do
-  # Tell the generator where to put its output (what it thinks of as Rails.root)
-  destination File.expand_path("../../../../../tmp", __FILE__)
-
-  before { prepare_destination }
+RSpec.describe Rspec::Generators::HelperGenerator, :type => :generator do
+  setup_default_destination
 
   subject { file('spec/helpers/posts_helper_spec.rb') }
   describe 'generated by default' do

spec/generators/rspec/install/install_generator_spec.rb

@@ -1,9 +1,8 @@
-require 'spec_helper'
+# Generators are not automatically loaded by Rails
 require 'generators/rspec/install/install_generator'
+require 'support/generators'
 
 RSpec.describe Rspec::Generators::InstallGenerator, :type => :generator do
-  destination File.expand_path("../../../../../tmp", __FILE__)
-
   def use_active_record_migration
     match(/ActiveRecord::Migration\./m)
   end
@@ -32,7 +31,7 @@ def use_transactional_fixtures
     match(/config\.use_transactional_fixtures/m)
   end
 
-  before { prepare_destination }
+  setup_default_destination
 
   let(:rails_helper) { content_for('spec/rails_helper.rb') }
   let(:spec_helper) { content_for('spec/spec_helper.rb') }

spec/generators/rspec/job/job_generator_spec.rb

@@ -1,13 +1,9 @@
-require 'spec_helper'
-
 # Generators are not automatically loaded by Rails
 require 'generators/rspec/job/job_generator'
+require 'support/generators'
 
 RSpec.describe Rspec::Generators::JobGenerator, :type => :generator, :skip => !RSpec::Rails::FeatureCheck.has_active_job? do
-  # Tell the generator where to put its output (what it thinks of as Rails.root)
-  destination File.expand_path('../../../../../tmp', __FILE__)
-
-  before { prepare_destination }
+  setup_default_destination
 
   describe 'the generated files' do
     before { run_generator %w(user) }

spec/generators/rspec/mailer/mailer_generator_spec.rb

@@ -1,13 +1,9 @@
-require 'spec_helper'
-
 # Generators are not automatically loaded by Rails
 require 'generators/rspec/mailer/mailer_generator'
+require 'support/generators'
 
-describe Rspec::Generators::MailerGenerator, :type => :generator do
-  # Tell the generator where to put its output (what it thinks of as Rails.root)
-  destination File.expand_path("../../../../../tmp", __FILE__)
-
-  before { prepare_destination }
+RSpec.describe Rspec::Generators::MailerGenerator, :type => :generator do
+  setup_default_destination
 
   describe 'mailer spec' do
     subject { file('spec/mailers/posts_spec.rb') }

spec/generators/rspec/model/model_generator_spec.rb

@@ -1,13 +1,9 @@
-require 'spec_helper'
-
 # Generators are not automatically loaded by Rails
 require 'generators/rspec/model/model_generator'
+require 'support/generators'
 
-describe Rspec::Generators::ModelGenerator, :type => :generator do
-  # Tell the generator where to put its output (what it thinks of as Rails.root)
-  destination File.expand_path("../../../../../tmp", __FILE__)
-
-  before { prepare_destination }
+RSpec.describe Rspec::Generators::ModelGenerator, :type => :generator do
+  setup_default_destination
 
   it 'runs both the model and fixture tasks' do
     gen = generator %w(posts)

spec/generators/rspec/observer/observer_generator_spec.rb

@@ -1,15 +1,13 @@
-require 'spec_helper'
-
 # Generators are not automatically loaded by Rails
 require 'generators/rspec/observer/observer_generator'
+require 'support/generators'
 
-describe Rspec::Generators::ObserverGenerator, :type => :generator do
-  # Tell the generator where to put its output (what it thinks of as Rails.root)
-  destination File.expand_path("../../../../../tmp", __FILE__)
+RSpec.describe Rspec::Generators::ObserverGenerator, :type => :generator do
+  setup_default_destination
 
   subject { file('spec/models/posts_observer_spec.rb') }
+
   before do
-    prepare_destination
     run_generator %w(posts)
   end
 

spec/generators/rspec/scaffold/scaffold_generator_spec.rb

@@ -1,11 +1,9 @@
-require 'spec_helper'
-
+# Generators are not automatically loaded by Rails
 require 'generators/rspec/scaffold/scaffold_generator'
+require 'support/generators'
 
-describe Rspec::Generators::ScaffoldGenerator, :type => :generator do
-  destination File.expand_path("../../../../../tmp", __FILE__)
-
-  before { prepare_destination }
+RSpec.describe Rspec::Generators::ScaffoldGenerator, :type => :generator do
+  setup_default_destination
 
   describe 'standard controller spec' do
     subject { file('spec/controllers/posts_controller_spec.rb') }

spec/generators/rspec/view/view_generator_spec.rb

@@ -1,13 +1,9 @@
-require 'spec_helper'
-
 # Generators are not automatically loaded by Rails
 require 'generators/rspec/view/view_generator'
+require 'support/generators'
 
-describe Rspec::Generators::ViewGenerator, :type => :generator do
-  # Tell the generator where to put its output (what it thinks of as Rails.root)
-  destination File.expand_path("../../../../../tmp", __FILE__)
-
-  before { prepare_destination }
+RSpec.describe Rspec::Generators::ViewGenerator, :type => :generator do
+  setup_default_destination
 
   describe 'with default template engine' do
     it 'generates a spec for the supplied action' do