我想从RSpec的选择列表中选择值。例如我有这样的数据:
<div class="control-group">
 <label class="control-label" for="user_teacher_leader_attributes_teacher_id">Teacher names</label>
  <div class="controls">
   <select id="user_teacher_leader_attributes_teacher_id" name="user[teacher_leader_attributes][teacher_id]">
    <option value="1" selected="selected">Math teacher</option>
    <option value="2">Physics teacher</option>       
  </div>
</div>
我想Physics teacher通过RSpec选择选项。我怎样才能做到这一点?另外,我可以按值从列表中选择一些东西(例如,Physics teacher按它具有的值“2”选择)吗?