Generators / tests: added support for RSpec

Presenter generator invokes test framework to generate presenter tests.

CHANGELOG.md

@@ -7,6 +7,7 @@
 	- `magic:presenter:install`
 	- `presenter`
 		- Test::Unit
+		- RSpec
 
 ### Fixed
 

config/initializers/rspec.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+RSpec.configure do |config|
+	config.include concern(:PresenterExampleGroup) {
+		included { metadata[:type] = :presenter }
+	}, file_path: %r'spec/presenters', type: :presenter
+end if defined? RSpec

lib/generators/presenter/USAGE

@@ -3,7 +3,7 @@ Description:
     CamelCased or under_scored, as an argument.
 
     This generator invokes your configured test framework, which
-    defaults to TestUnit.
+    defaults to TestUnit. It supports both TestUnit and RSpec.
 
     If a `--parent` option is given, it’s used as a superclass of the
     created presenter.
@@ -15,10 +15,14 @@ Example:
         Presenter:  app/presenters/account_presenter.rb
       for TestUnit:
         Test:       test/presenters/account_presenter_test.rb
+      for RSpec:
+        Spec:       spec/presenters/account_presenter_spec.rb
 
     bin/rails generate presenter admin/account
 
     This will create:
         Presenter:  app/presenters/admin/account_presenter.rb
       for TestUnit:
         Test:       test/presenters/admin/account_presenter_test.rb
+      for RSpec:
+        Spec:       spec/presenters/admin/account_presenter_spec.rb

lib/generators/rspec/presenter/presenter_generator.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require 'generators/rspec'
+require 'generators/magic/presenter/generator'
+
+module Rspec # :nodoc:
+	module Generators # :nodoc:
+		class PresenterGenerator < Base # :nodoc:
+			include Magic::Presenter::Generator
+
+			source_root File.expand_path('templates', __dir__)
+
+			cattr_reader :target_root, default: Pathname('spec')
+
+			def create_test_file
+				template 'presenter_spec.rb', "#{file_path}_spec.rb"
+			end
+		end
+	end
+end

lib/generators/rspec/presenter/templates/presenter_spec.rb.tt

@@ -0,0 +1,7 @@
+require 'rails_helper'
+
+<% module_namespacing do -%>
+RSpec.describe <%= class_name %> do
+  pending "add some examples to (or delete) #{__FILE__}"
+end
+<% end -%>

spec/generator/presenter_generator_spec.rb

@@ -48,6 +48,26 @@
 					it { is_expected.to be < ActiveSupport::TestCase }
 				end
 			end
+
+			context 'with RSpec' do
+				let(:options) { { test_framework: :rspec } }
+
+				let :path do
+					load file super() # the presenter should be defined before loading the spec
+
+					"spec/presenters/#{presenter_name.underscore}_spec.rb"
+				end
+
+				include_examples 'generates a valid file'
+
+				describe 'generated spec' do
+					subject { "RSpec::ExampleGroups::#{presenter_name.delete '::'}_3".safe_constantize } # HACK: name heuristics
+
+					it { is_expected.to be < RSpec::Core::ExampleGroup }
+					it { is_expected.to be < PresenterExampleGroup }
+					it { is_expected.to have_attributes metadata: include(type: :presenter) }
+				end
+			end
 		end
 	end