output.html

<tr>
  <td class="my-label">
    <input type="checkbox" name="user[role_ids][]" id="role_1" value="1" checked="checked" />
  </td>
  <td class="value">
    <label for="role_1">Approver</label>
  </td>
</tr>

users_spec.rb

    scenario "can un-assign roles for user" do
      r = Role.where(name: 'Approver').first
      u = create(:user)
      u.set_roles :approver                                                                                                                                         
      visit edit_admin_user_path u
      uncheck 'Approver'
      click_button 'Update User'
      expect(u.roles).to_not include r
    end

behaves as if uncheck 'Approver' doesn't happen.
this all works in the browser, just can't get the spec working.
is this not how I should be unchecking a checkbox?