RSpec doesn't use cache - ruby-on-rails

Question

I'm playing around with RSpec to make sure caching is properly working.
I have a simple controller
module Api::V1
class ArticlesController < Api::V1::BaseController
def index
#articles = Rails.cache.fetch(Article.cache_key) do
p "IT IS A MISS" # Added for debugging
Article.all
end
end
end
end
and the spec below
RSpec.describe Api::V1::ArticlesController, type: :request do
...
it 'cache?', :caching do
create_list(:article, 2)
get '/api/v1/articles.json'
expect(JSON.parse(response.body).size).to eq(2)
create(:article)
get '/api/v1/articles.json'
expect(JSON.parse(response.body).size).to eq(2)
end
end
with the following configuration
RSpec.configure do |config|
config.around(:each, :caching) do |example|
Rails.cache.clear
caching = ActionController::Base.perform_caching
ActionController::Base.perform_caching = example.metadata[:caching]
example.run
ActionController::Base.perform_caching = caching
end
end
To make the spec pass and insure the cache is a hit I have defined cache_key as follows
def self.cache_key
'articles'
end
However, even if the cache is a miss only for the first request, the spec fails.
% RUBYOPT="-W0" bin/rspec spec/requests/api/v1/articles_controller_spec.rb:35
"IT IS A MISS"
F
Failures:
1) Api::V1::ArticlesController cache? is expected to eq 2
Failure/Error: expect(JSON.parse(response.body).size).to eq(2)
expected: 2
got: 3
(compared using ==)
# ./spec/requests/api/v1/articles_controller_spec.rb:39:in `block (4 levels) in <top (required)>'
# ./spec/support/config/capybara.rb:21:in `block (2 levels) in <main>'
Am I missing anything here?