capybara_with_files

  describe 'upload files to collection', :js do

    it "preselects the collection we are uploading files to" do
      attach_file('files[]', File.dirname(__FILE__) + '/../../spec/fixtures/image.jp2')
      attach_file('files[]', File.dirname(__FILE__) + '/../../spec/fixtures/jp2_fits.xml')

      expect(page).to have_css('button#main_upload_start[disabled]')

      first(:checkbox, 'terms_of_service').click

      expect(page).to have_css('button#main_upload_start')

      click_button 'main_upload_start'

      expect(page).to have_css('button#main_upload_start')  # passes and shouldn't - means it is still on the upload page

      expect(page).to have_css('button#upload_submit')  # fails and shouldn't - means it didn't go to the metadata entry page

      fill_in('generic_file[tag][]', with: 'Test')
      click_button 'upload_submit'

      updated_collection = Collection.find(collection1.id)
      expect(updated_collection.member_ids).to eq ['test_1','test_2','test_3']
    end
  end

Interactively, you will stay on the upload page when you click 'main_upload_button' (aka Start Upload) if no files are selected.

I confirmed that both attach_file statements work be testing...

• set one in filesXXX[] instead of files[] --> fails because filesXXX[] does not exist on the page
• set path_to_file to non-existent file --> fails because file didn't exist

This confirms that files[] is a valid field and that the two files are valid.

What I am not sure of is whether the files need to be set elsewhere in addition to files[] or some other indicator to be set for Start upload to execute properly.