Add end-to-end test for OCR in media uploads

app/javascript/mastodon/features/compose/components/upload_button.jsx

@@ -65,6 +65,7 @@ class UploadButton extends ImmutablePureComponent {
             key={resetFileKey}
             ref={this.setRef}
             type='file'
+            name='file-upload-input'
             multiple
             accept={acceptContentTypes.toArray().join(',')}
             onChange={this.handleChange}

spec/system/ocr_spec.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe 'OCR', :paperclip_processing, :sidekiq_inline do
+  include ProfileStories
+
+  let(:email)               { 'test@example.com' }
+  let(:password)            { 'password' }
+  let(:confirmed_at)        { Time.zone.now }
+  let(:finished_onboarding) { true }
+
+  before do
+    as_a_logged_in_user
+    visit root_path
+  end
+
+  it 'can recognize text in a media attachment' do
+    expect(page).to have_css('div.app-holder')
+
+    within('.compose-form') do
+      attach_file('file-upload-input', file_fixture('text.png'), make_visible: true)
+
+      within('.compose-form__upload') do
+        click_on('Edit')
+      end
+    end
+
+    click_on('Detect text from picture')
+
+    expect(page).to have_css('#upload-modal__description', text: 'Hello Mastodon')
+  end
+end