Add generator for system spec

* added generator for system spec

* fixed spec for --no-system-specs

* refactored to ensure that both usecases are using same path

* Refere to system spec instead of feature spec

* Specs need to be different for Rails under 5.1

* Don't provide system spec generator under Rails 5.1

Author: benoittgt

lib/generators/rspec/system/system_generator.rb

@@ -0,0 +1,26 @@
+require 'generators/rspec'
+
+if ::Rails::VERSION::STRING >= '5.1'
+  module Rspec
+    module Generators
+      # @private
+      class SystemGenerator < Base
+        class_option :system_specs, :type => :boolean, :default => true,  :desc => "Generate system specs"
+
+        def generate_system_spec
+          return unless options[:system_specs]
+
+          template template_name, File.join('spec/system', class_path, filename)
+        end
+
+        def template_name
+          'system_spec.rb'
+        end
+
+        def filename
+          "#{table_name}_spec.rb"
+        end
+      end
+    end
+  end
+end

lib/generators/rspec/system/templates/system_spec.rb

@@ -0,0 +1,9 @@
+require 'rails_helper'
+
+RSpec.describe "<%= class_name.pluralize %>", <%= type_metatag(:system) %> do
+  before do
+    driven_by(:rack_test)
+  end
+
+  pending "add some scenarios (or delete) #{__FILE__}"
+end

spec/generators/rspec/system/system_generator_spec.rb

@@ -0,0 +1,40 @@
+# Generators are not automatically loaded by rails
+if ::Rails::VERSION::STRING >= '5.1'
+  require 'generators/rspec/system/system_generator'
+  require 'support/generators'
+
+  RSpec.describe Rspec::Generators::SystemGenerator, :type => :generator do
+    setup_default_destination
+
+    describe "system specs" do
+      subject(:system_spec) { file("spec/system/posts_spec.rb") }
+      describe "are generated independently from the command line" do
+        before do
+          run_generator %w(posts)
+        end
+        describe "the spec" do
+          it "exists" do
+            expect(system_spec).to exist
+          end
+          it "contains 'rails_helper'" do
+            expect(system_spec).to contain(/require 'rails_helper'/)
+          end
+          it "contains the system" do
+            expect(system_spec).to contain(/^RSpec.describe \"Posts\", #{type_metatag(:system)}/)
+          end
+        end
+      end
+
+      describe "are not generated" do
+        before do
+          run_generator %w(posts --no-system-specs)
+        end
+        describe "the spec" do
+          it "does not exist" do
+            expect(system_spec).to_not exist
+          end
+        end
+      end
+    end
+  end
+end