undefined method 'post'

gistfile1.rb

# file located spec/mapi/v1/authentication_spec.rb
# exception:
#   NoMethodError:
#       undefined method `post' for #<RSpec::Core::ExampleGroup::Nested_1::Nested_1:0xc652514>
#     # ./spec/mapi/v1/authentication_spec.rb:6:in `block (3 levels) in <top (required)>'

require 'spec_helper'

describe Mapi::V1::SessionsController, :type => :api do
  context 'unsuccessful authentication' do 
    it 'should not authenticate on wrong credentials' do
      post '/mapi/v1/login', email: 'john.doe@mail.dk', password: 'wrong', device_id: '123456789abc'

      response.code.should == '401'
      JSON.parse(response.body).should == { :maintenance => 0 }
    end
  end
end