Rakefile in danger-mention-0.2 vs Rakefile in danger-mention-0.4.0

@@ -1,5 +1,23 @@
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
+require 'rubocop/rake_task'
 
-RSpec::Core::RakeTask.new(:spec)
-task default: :spec
+RSpec::Core::RakeTask.new(:specs)
+
+task default: :specs
+
+task :spec do
+  Rake::Task['specs'].invoke
+  Rake::Task['rubocop'].invoke
+  Rake::Task['spec_docs'].invoke
+end
+
+desc 'Run RuboCop on the lib/specs directory'
+RuboCop::RakeTask.new(:rubocop) do |task|
+  task.patterns = ['lib/**/*.rb', 'spec/**/*.rb']
+end
+
+desc 'Ensure that the plugin passes `danger plugins lint`'
+task :spec_docs do
+  sh 'bundle exec danger plugins lint'
+end