Added a test case for Devise Generator

test/generators/devise_generator_test.rb

@@ -0,0 +1,27 @@
+require 'test_helper'
+
+require "generators/devise/devise_generator"
+
+class DeviseGeneratorTest < Rails::Generators::TestCase
+  tests Devise::Generators::DeviseGenerator
+  destination File.expand_path("../../tmp", __FILE__)
+
+  setup do
+    prepare_destination
+    copy_routes
+  end
+
+  test "route generation for simple model names" do
+    run_generator %w(monster name:string)
+    assert_file "config/routes.rb", /devise_for :monsters/
+  end
+
+  def copy_routes
+    routes = File.expand_path("../../rails_app/config/routes.rb", __FILE__)
+    destination = File.join(destination_root, "config")
+
+    FileUtils.mkdir_p(destination)
+    FileUtils.cp routes, destination
+  end
+
+end