Add placeholder test files

Rakefile

@@ -0,0 +1,8 @@
+require 'rake/testtask'
+
+Rake::TestTask.new do |t|
+  t.libs << 'test'
+end
+
+desc "Run tests"
+task :default => :test

lib/wayback_machine_downloader.rb

@@ -1,5 +1,5 @@
 class WaybackMachineDownloader
   def self.hi name
-    puts "Hello world! #{name}"
+    "Hello world! #{name}"
   end
 end

test/test_wayback_machinve_downloader.rb

@@ -0,0 +1,8 @@
+require 'minitest/autorun'
+require 'wayback_machine_downloader'
+
+class WaybackMachineDownloaderTest < Minitest::Test
+  def test_english_hello
+    assert_equal "Hello world! John", WaybackMachineDownloader.hi("John")
+  end
+end