run all the tests rake task

Rakefile

@@ -1,2 +1,10 @@
 #!/usr/bin/env rake
 require "bundler/gem_tasks"
+require "rake/testtask"
+
+Rake::TestTask.new(:test) do |t|
+  t.libs << "test"
+  t.pattern = 'test/**/*_test.rb'
+  t.verbose = true
+end
+Rake::Task["test"].comment = "run the tests"