override.rake

require File.join(Rails.root, 'lib', 'rake_remove_task')
# Override 'rake test' to run rspec and cucumber instead of TestUnit

remove_task :test
desc "Run RSpec and Cucumber tests"
task :test => [:spec, :features]

rake_remove_task.rb

# This little nugget will remove an existing rake task. This allows you to 
# redefine tasks. 
#
#   remove_task :test
#   task :test => [:spec, :features]
#
Rake::TaskManager.class_eval do
  def remove_task(task_name)
    @tasks.delete(task_name.to_s)
  end
end

def remove_task(task_name)
  Rake.application.remove_task(task_name)
end