diff --git a/railties/test/generators/app_generator_test.rb b/railties/test/generators/app_generator_test.rb
index 4b74bd6a4b13a8e9c8ed8c39404c673938305f84..955ed09361e05d1256cb318b36c3a4304ac38d38 100644
--- a/railties/test/generators/app_generator_test.rb
+++ b/railties/test/generators/app_generator_test.rb
@@ -143,6 +143,16 @@ def test_config_another_database
     end
   end
 
+  def test_config_postgresql_database
+    run_generator([destination_root, "-d", "postgresql"])
+    assert_file "config/database.yml", /postgresql/
+    unless defined?(JRUBY_VERSION)
+      assert_file "Gemfile", /^gem\s+["']pg["']$/
+    else
+      assert_file "Gemfile", /^gem\s+["']activerecord-jdbcpostgresql-adapter["']$/
+    end
+  end
+
   def test_config_jdbcmysql_database
     run_generator([destination_root, "-d", "jdbcmysql"])
     assert_file "config/database.yml", /mysql/