TOTD# 36: Writing First Test for a Rails Application

Posted by arungupta on July 1, 2008 at 9:23 AM EDT

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.

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.

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.
http://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.
http://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

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.
http://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:

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

require 'home_controller'

class HomeControllerTest < ActionController::TestCase
def test_index
get :index
assert_response :success
end

end

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.
http://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.

Technorati: rubyonrails jruby ruby glassfish totd

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Arun Gupta

TOTD# 36: Writing First Test for a Rails Application

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