Remove unused global variables

spec/controllers/matches_controller_spec.rb

@@ -3,16 +3,6 @@
 require 'rails_helper'
 
 RSpec.describe MatchesController, type: :controller do
-  let(:valid_attributes) do
-    skip('Add a hash of attributes valid for your model')
-  end
-
-  let(:invalid_attributes) do
-    skip('Add a hash of attributes invalid for your model')
-  end
-
-  let(:valid_session) { {} }
-
   before do
     @match = create(:match)
     @match.scores = create_pair(:score)