TOTD# 36: Writing First Test for a Rails Application

I’ve created a Rails “Hello World” app numerous times. But I decided to write a simple using the testing framework provided by Rails. This blog explains my experience of writing such a test.

1. Create a “Hello World” app as:

   ~/samples/jruby/test >~/testbed/jruby-1.1.2/bin/jruby -S rails helloworld               create        create  app/controllers       create  app/helpers       create  app/models       create  app/views/layouts       create  config/environments       create  config/initializers . . .       create  log/production.log       create  log/development.log       create  log/test.log

   There is no “-d mysql” in the command because I don’t expect this application to do any database access. The database access is disabled by following

   TOTD #26

   .

2. I tried generating a new controller using the command:

   ~/samples/jruby/test/helloworld >~/testbed/jruby-1.1.2/bin/jruby script/generate controller home index

   and got the error:

   JRuby limited openssl loaded. gem install jruby-openssl for full support. https://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL /Users/arungupta/testbed/jruby-1.1.2/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:278:in `load_missing_constant’: uninitialized constant ActiveRecord (NameError)         from /Users/arungupta/testbed/jruby-1.1.2/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:467:in `const_missing’         from /Users/arungupta/testbed/jruby-1.1.2/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:479:in `const_missing’         from /Users/arungupta/samples/jruby/test/helloworld/config/initializers/new_rails_defaults.rb:5:in `/Users/arungupta/samples/jruby/test/helloworld/config/initializers/new_rails_defaults.rb’         from /Users/arungupta/samples/jruby/test/helloworld/config/initializers/new_rails_defaults.rb:502:in `load’         from /Users/arungupta/testbed/jruby-1.1.2/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:502:in `load’         from /Users/arungupta/testbed/jruby-1.1.2/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:354:in `new_constants_in’         from /Users/arungupta/testbed/jruby-1.1.2/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:502:in `load’         from /Users/arungupta/testbed/jruby-1.1.2/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/initializer.rb:475:in `load_application_initializers’          … 8 levels…         from /Users/arungupta/testbed/jruby-1.1.2/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/commands/generate.rb:27:in `require’         from /Users/arungupta/testbed/jruby-1.1.2/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require’         from script/generate:3

   So even though database access has been explicitly disabled, there are still references to ActiveRecord. So I had to explicitly disable them by changing the code in “config/initializers/new_rails_defaults.rb” as:

   if defined?(ActiveRecord) # Include Active Record class name as root for JSON serialized output. ActiveRecord::Base.include_root_in_json = true # Store the full class name (including module namespace) in STI type column. ActiveRecord::Base.store_full_sti_class = true end

   and then the controller is easily generated as:

   ~/samples/jruby/test/helloworld >~/testbed/jruby-1.1.2/bin/jruby script/generate controller home index JRuby limited openssl loaded. gem install jruby-openssl for full support. https://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL       exists  app/controllers/       exists  app/helpers/       create  app/views/home       exists  test/functional/       create  app/controllers/home_controller.rb       create  test/functional/home_controller_test.rb       create  app/helpers/home_helper.rb       create  app/views/home/index.html.erb

3. Run your application using GlassFish v3 gem as:

   ~/workspaces/glassfish-scripting/rails/v3/src/test/rails >~/testbed/jruby-1.1.2/bin/jruby -S glassfish_rails helloworld Jun 27, 2008 2:46:18 PM com.sun.enterprise.glassfish.bootstrap.ASMain main INFO: Launching GlassFish on HK2 platform Jun 27, 2008 2:46:18 PM com.sun.enterprise.glassfish.bootstrap.ASMainHK2 findDerbyClient INFO: Cannot find javadb client jar file, jdbc driver not available Jun 27, 2008 2:46:18 PM com.sun.enterprise.v3.services.impl.GrizzlyProxy start INFO: Listening on port 3000 Jun 27, 2008 2:46:18 PM com.sun.enterprise.v3.services.impl.GrizzlyEmbeddedHttpConfigurator configureSSL WARNING: pewebcontainer.all_ssl_protocols_disabled Jun 27, 2008 2:46:18 PM com.sun.enterprise.v3.services.impl.GrizzlyEmbeddedHttpConfigurator configureSSL WARNING: pewebcontainer.all_ssl_ciphers_disabled Jun 27, 2008 2:46:19 PM com.sun.enterprise.v3.services.impl.GrizzlyProxy start INFO: Listening on port 3131 Jun 27, 2008 2:46:19 PM com.sun.enterprise.v3.services.impl.GrizzlyProxy start INFO: Listening on port 3838 Jun 27, 2008 2:46:19 PM com.sun.enterprise.v3.admin.adapter.AdminConsoleAdapter setContextRoot INFO: Admin Console Adapter: context root: /admin Jun 27, 2008 2:46:19 PM com.sun.grizzly.jruby.RailsAdapter startRubyRuntimePool INFO: Starting Rails instances Jun 27, 2008 2:46:24 PM   SEVERE: JRuby limited openssl loaded. gem install jruby-openssl for full support. https://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL Jun 27, 2008 2:46:24 PM com.sun.grizzly.jruby.RubyObjectPool$1 run INFO: JRuby and Rails instance instantiation took : 5169ms Jun 27, 2008 2:46:24 PM org.glassfish.scripting.rails.RailsDeployer load INFO: Loading application helloworld at / Jun 27, 2008 2:46:24 PM com.sun.enterprise.v3.server.AppServerStartup run INFO: Glassfish v3 started in 6419 ms Jun 27, 2008 2:46:28 PM com.sun.grizzly.jruby.RailsAdapter$Logger log INFO:

4. Chapter 9 in Rails Manual explains how to test controllers. Modify “test/functional/home_controller_test.rb” as:

   require ‘home_controller’ class HomeControllerTest   def test_index     get :index     assert_response :success   end end

5. Run the test as:

   ~/workspaces/glassfish-scripting/rails/v3/src/test/rails/helloworld >~/testbed/jruby-1.1.2/bin/jruby -S rake test (in /Users/arungupta/workspaces/glassfish-scripting/rails/v3/src/test/rails/helloworld) /Users/arungupta/testbed/jruby-1.1.2/bin/jruby -Ilib:test “/Users/arungupta/testbed/jruby-1.1.2/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake/rake_test_loader.rb”   /Users/arungupta/testbed/jruby-1.1.2/bin/jruby -Ilib:test “/Users/arungupta/testbed/jruby-1.1.2/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake/rake_test_loader.rb” “test/functional/home_controller_test.rb” JRuby limited openssl loaded. gem install jruby-openssl for full support. https://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL Loaded suite /Users/arungupta/testbed/jruby-1.1.2/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake/rake_test_loader Started . Finished in 0.308 seconds. 1 tests, 1 assertions, 0 failures, 0 errors /Users/arungupta/testbed/jruby-1.1.2/bin/jruby -Ilib:test “/Users/arungupta/testbed/jruby-1.1.2/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake/rake_test_loader.rb”

If you indeed are using database (which is the most common case anyway) then you can load data using

Fixtures

and then

Test your Models

.

Keep adding controller and models and testing them!

Please leave suggestions on other TOTD (Tip Of The Day) that you’d like to see. A complete archive is available here.

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