Example of lib/active_model_serializers/rspec.rb including ActiveModelSerializers::RSpecMatchers::Schema automatically.

rspec.rb

module ActiveModelSerializers
  # @api public
  # Container module for active_model_serializers specific matchers.
  module RSpecMatchers
    extend ActiveSupport::Autoload
    autoload :Schema, 'active_model_serializers/rspec_matchers/schema'
  end
end

RSpec.configure do |config|
  config.include ActiveModelSerializers::RSpecMatchers::Schema, type: :request
  config.include ActiveModelSerializers::RSpecMatchers::Schema, type: :controller
end

Two config.include ActiveModelSerializers::RSpecMatchers::Schema because of rspec/rspec-rails#1349