Minitest + Capybara：如何检查选项列表是否不包含选项？

Question

In my application i have a select tag containing some options:

<select class="form-control" id="select-course-js">
     <option>course-1</option> 
     <option>course-2</option>
     <option>course-3</option>
</select>

I would like to implement a system test that check if there is no course-4 option. Is it possible to do it with capybara? if so - how? stack: rails5 + Minitest + Capybara

Update. Solution (given by Thomas Walpole)

assert_no_select('select-course-js', with_options: ['course-4'])

Answer 1

You can verify there is no select 'select-course-js' on the page with course-4 as an option via

assert_no_select('select-course-js', with_options: ['course-4'])

however that won't also verify that the select-course-js select is on the page, so you probably want to do both

assert_select('select-course-js')
assert_no_select('select-course-js', with_options: ['course-4'])

Another option would be to use the optional filter block

assert_select('select-course-js') do |el|
  el.has_no_selector?(:option, 'course-4')
end

but the error won't be as clear if the test fails.

Answer 2

One way is to add id's to each option and check whether it exists...

<select class="form-control" id="select-course-js">
  <option id="crs-1">course-1</option> 
  <option id="crs-2">course-2</option>
  <option id="crs-3">course-3</option>
</select>

Then just check whether crs-4 exists. The method you use will depend on your particular logic but here are a couple examples...

assert_no_css('#select-course-js #crs-4')
page.has_css?('#select-course-js #crs-4')

You can find other methods to use here