Rakefile in epub-maker-0.1.4 vs Rakefile in epub-maker-0.1.5

@@ -1,12 +1,18 @@
 require 'rake/testtask'
 require 'rake/clean'
 require 'yard'
 require "rubygems/tasks"
+  require "open-uri"
 
 task :default => :test
 
 CLEAN.include 'README.html'
 
+VALID_EPUB = "test/fixtures/accessible_epub_3.epub"
+file VALID_EPUB do |t|
+  File.write t.name, URI("https://github.com/IDPF/epub3-samples/releases/download/20170606/accessible_epub_3.epub").read
+end
 Rake::TestTask.new
+task test: VALID_EPUB
 YARD::Rake::YardocTask.new
 Gem::Tasks.new