How to call a rake task in rspec

I am trying to invoke a rake task in in my rspec.

  require "rake"
  rake = Rake::Application.new
  Rake.application = rake
  rake.init
  rake.load_rakefile
  rake['rake my:task'].invoke

But i am getting error

 Failure/Error: rake['rake db:migrate'].invoke
 RuntimeError:
   Don't know how to build task 'rake db:migrate'

Does anyone have a idea how we can invoke rake task in rspec code.

Any help would be highly appreciated.

Solution

To pass in the arguments in square brackets to invoke:

rake sim:manual_review_referral_program[3,4]

becomes:

rake['sim:manual_review_referral_program'].invoke(3,4)

If your args are in an array, you can do the following:

args = [3,4]
rake['sim:manual_review_referral_program'].invoke(*args)