Problemns with module classes for rspec testing

error_returned

~/.rvm/rubies/ruby-1.9.3-p194/bin/ruby -S rspec spec/dm_cloud/media_spec.rb spec/dm_cloud/streaming_spec.rb spec/dm_cloud_spec.rb
~/Projects/dm_cloud/spec/dm_cloud/media_spec.rb:4:in `<top (required)>': uninitialized constant DMCloud (NameError)

media.rb

# lib/dm_cloud/media.rb
module DMCloud
  class Media
    def my_method
      ...
    end
  end
end

media_spec.rb

# spec/dm_cloud/media_spec.rb

require 'dm_cloud/media'

describe DMCloud::Media do
  context "should get my method" do
  it "should return somthing" do
    ...
    end
  end 
end