Rakefile example for passing parameters for optparse

Rakefile

require 'rake'
require 'rake/testtask'

# uses '--' args format because ruby 'optparse' lib wants it that way
# runs myapp tests with args client, env, and application
namespace :myapp do |args|

  desc "Example test task."
  Rake::TestTask.new do |t|
    t.name = "runTestsReal"
    t.test_files = FileList['test/**/*_test.rb'].exclude(
      'test/integration/**/*_test.rb'
    )
    t.verbose = true
  end

  desc "Runs all tests."
  task :runTests, [:client, :env, :app] do |t, args|    
    puts "Args: #{args}"
  end
  
  desc "Runs example."
  task :example do    
    Rake.application.invoke_task("myapp:runTests[--client=EXAMPLE, --env=Staging, --app=myapp]")
  end
  
  desc "Runs example alternate."
  task :exampleAlt do    
    Rake::Task["myapp:runTests"].invoke('--client=EXAMPLE', '--env=Staging', '--app=myappalt')
  end
  
  desc "Runs tests with default values."
  task :defaults, :client, :env, :app do |t, args|    
    args.with_defaults(:default_client => '--client=EXAMPLE', :default_env => '--env=Staging', :default_app => '--app=myapp')
    puts "Args: #{args}"
  end

end

desc "Prints out envs for fun, usage : 'client=EXAMPLE env=Staging app=myapp rake printEnvs'."
task :printEnvs do |t, args|  
  puts "client is #{ENV['client']}"
  puts "env is #{ENV['env']}"
  puts "app is #{ENV['app']}"
end