rspecの練習用にrbファイルをアップロードします.

rspecの練習用に参考にしたURLは、
http://tech.recompile.net/post/21340599029/rspec?fb_action_ids=1418147341737733&fb_action_types=og.likes&fb_source=other_multiline&action_object_map=%7B%221418147341737733%22%3A10150664696635841%7D&action_type_map=%7B%221418147341737733%22%3A%22og.likes%22%7D&action_ref_map=%5B%5Dhttp://tech.recompile.net/post/21340599029/rspec?fb_action_ids=1418147341737733&fb_action_types=og.likes&fb_source=other_multiline&action_object_map=%7B%221418147341737733%22%3A10150664696635841%7D&action_type_map=%7B%221418147341737733%22%3A%22og.likes%22%7D&action_ref_map=%5B%5D