Clean up generator for generator specs

Don't force pluralization of the generator name in the generated spec
and use the full generator name in the spec description.

Also clean up an extra whitespace and empty line in the template.

Note that the generator class constant cannot be directly used in the
spec description as it isn't loaded by default.

lib/generators/rspec/generator/generator_generator.rb

@@ -4,7 +4,7 @@ module Rspec
   module Generators
     # @private
     class GeneratorGenerator < Base
-      class_option :generator_specs, type: :boolean, default: true,  desc: "Generate generator specs"
+      class_option :generator_specs, type: :boolean, default: true, desc: 'Generate generator specs'
 
       def generate_generator_spec
         return unless options[:generator_specs]
@@ -17,7 +17,7 @@ def template_name
       end
 
       def filename
-        "#{table_name}_generator_spec.rb"
+        "#{file_name}_generator_spec.rb"
       end
     end
   end

lib/generators/rspec/generator/templates/generator_spec.rb

@@ -1,6 +1,5 @@
 require 'rails_helper'
 
-RSpec.describe "<%= class_name.pluralize %>", <%= type_metatag(:generator) %> do
-
+RSpec.describe "<%= class_name %>Generator", <%= type_metatag(:generator) %> do
   pending "add some scenarios (or delete) #{__FILE__}"
 end

spec/generators/rspec/generator/generator_generator_spec.rb

@@ -11,7 +11,7 @@
     end
 
     it "include the standard boilerplate" do
-      expect(generator_spec).to contain(/require 'rails_helper'/).and(contain(/^RSpec.describe "Posts", #{type_metatag(:generator)}/))
+      expect(generator_spec).to contain(/require 'rails_helper'/).and(contain(/^RSpec.describe "PostsGenerator", #{type_metatag(:generator)}/))
     end
   end
 end