NoMethodError: undefined method `[]' for nil:NilClass error at omniauth gem testing

NoMethodError: undefined method `[]' for nil:NilClass error at omniauth
gem testing

References

Reference NO 1

http://stackoverflow.com/questions/15198866/nomethoderror-undefined-method-for-nilnilclass-error-at-omniauth-gem-test

Reference NO 2

http://stackoverflow.com/questions/11710660/rspec-simple-example-getting-error-on-request-variable-in-integration-test

Reference NO 3

https://github.com/fertapric/rails3-mongoid-devise-omniauth/issues/5

Reference NO 4

http://railscasts.com/episodes/235-devise-and-omniauth-revised?view=comments

Reference NO 5

http://railscasts.com/episodes/236-omniauth-part-2?view=comments

Reference NO 6

http://net.tutsplus.com/tutorials/ruby/how-to-use-omniauth-to-authenticate-your-users/

Reference NO 7

#EANF#

Reference NO 8

#EANF#