Example disabled: should allow the content type to be specified

*****************************************************************
DEPRECATION WARNING: you are using deprecated behaviour that will
be removed from a future version of RSpec.

./spec/private/core/configuration_spec.rb:4

* predicate_matchers is deprecated.
* please use the new Matcher DSL instead.
*****************************************************************

*****************************************************************
DEPRECATION WARNING: you are using deprecated behaviour that will
be removed from a future version of RSpec.

./spec/private/core/configuration_spec.rb:5

* predicate_matchers is deprecated.
* please use the new Matcher DSL instead.
*****************************************************************