Using assert_select to find a select box value?

Question

I'm struggling to test whether my select box has a value of 6.

<form class="edit_line_item" id="edit_line_item_7" action="/line_items/7" accept-charset="UTF-8" method="post"><input name="utf8" type="hidden" value="✓"><input type="hidden" name="_method" value="patch">
    <select name="line_item[quantity]" id="line_item_quantity"><option selected="selected" value="1">1</option>
    </select>
</form>

My rspec code

assert_select "select#line_item_quantity", value: 6

Whatever I change the value to my test still passes so I am wrong somewhere.

Answer 1

To use assert_select this way you have to pass it a block and do your assertion on the array of elements passed to the block.

assert_select is "An assertion that selects elements and makes one or more equality tests"

Example:

 assert_select "ol" do |elements|
   elements.each do |element|
     assert_select element, "li", 4
   end
 end

You need to tweak this example to assert based on the value attribute of the option tag within the selected element (a select tag in this case).

I recommend reading the docs: http://apidock.com/rails/v2.3.8/ActionController/Assertions/SelectorAssertions/assert_select

If you're using capybara you can use have_select. Answer here: https://stackoverflow.com/a/18622979/156746