Run single test example or test case with Rake task or ruby command line

run test.sh

# In Rails 3.2.x
#   You can run a single test based on a file like:
rake test TEST=test/functionals/xxx_controller_test.rb

#   Or even a single test example like:
ruby -I 'lib:test' test/functionals/xxx_controller_test.rb -n test_edit_profile_without_login

# In Rails 4.x.x
#   You can run a single test based on a file like:
rake test /test/functionals/xxx_controller_test.rb     # Notice: We don't need TEST system variable any more!

#   Or even a single test example like:
rake test /test/functionals/xxx_controller_test.rb test_edit_profile_without_login # Notice: We can run a rake task directly instead of ruby command