database.spec

module Foo
  module Bar
    module Database
      DB = Foo::Bar.configuration.database
      
      def update_result(name, status)
        # do something
      end
    end
  end
end

database_spec.rb

module Foo
  module Bar
    RSpec.describe Database do
      let(:dummy) { Class.new { include Database } }
      
      it 'test1' do
        dummy.update_result('myname', 'success')
      end
    end
  end
end