lib/rspec/rails/extensions/active_record/proxy.rb
RSpec.configure do |rspec|
# Delay this in order to give users a chance to configure `expect_with`...
rspec.before(:suite) do
if defined?(RSpec::Matchers) && RSpec::Matchers.configuration.syntax.include?(:should) && defined?(ActiveRecord::Associations)
RSpec::Matchers.configuration.add_should_and_should_not_to ActiveRecord::Associations::CollectionProxy
end
end
end