Set up minitest

Gemfile

@@ -2,3 +2,5 @@ source 'https://rubygems.org'
 
 # Specify your gem's dependencies in active_model_serializers.gemspec
 gemspec
+
+gem "minitest"

Rakefile

@@ -1,3 +1,12 @@
 require "bundler/gem_tasks"
 
-task :default
+require 'rake/testtask'
+
+Rake::TestTask.new do |t|
+  t.libs << "lib"
+  t.test_files = FileList['test/*_test.rb']
+  t.ruby_opts = ['-r./test/test_helper.rb']
+  t.verbose = true
+end
+
+task :default => :test