class RuboCop::Cop::RSpec::VerifiedDoubles

Prefer using verifying doubles over normal doubles.

@see rspec.info/features/3-12/rspec-mocks/verifying-doubles

@example

# bad
let(:foo) do
  double(method_name: 'returned value')
end

# bad
let(:foo) do
  double("ClassName", method_name: 'returned value')
end

# good
let(:foo) do
  instance_double("ClassName", method_name: 'returned value')
end