Rspec: we should declare only `let` variables which we really use in the test.

[roman-dubrovsky]

Is your feature request related to a problem? Please describe.

In the we file, we should declare only let variables which we really use in the test.

let(:user) { User.new }
let(:old_user) { User.new }
let(:shared_example_user) { User.new} # this variable we're using somewhere in the shared examples

it_behaves_like "shared example with shared_example_user" 

it { expect(user).is be_good_variable } 

In the example above, we should remove old_user and declare shared_example_user only for shared example

let(:user) { User.new }

it_behaves_like "shared example with shared_example_user" do
  let(:shared_example_user) { User.new} 
end

it { expect(user).is be_good_variable } 

Thoughts?