# frozen_string_literal: true require "active_storage/previewer/video_previewer" class ActiveStorage::Previewer::VideoPreviewerTest < ActiveSupport::TestCase setup do @blob = create_file_blob(filename: "video.mp4", content_type: "video/mp4") end test "previewing an MP4 video" do ActiveStorage::Previewer::VideoPreviewer.new(@blob).preview do |attachable| assert_equal "image/png", attachable[:content_type] assert_equal "video.png", attachable[:filename] image = MiniMagick::Image.read(attachable[:io]) assert_equal 640, image.width assert_equal 480, image.height end end end