Define a test task

Author: Edouard-chin

Rakefile

@@ -1,5 +1,10 @@
 # frozen_string_literal: true
 
 require "bundler/gem_tasks"
+require "minitest/test_task"
+
+Minitest::TestTask.create do |t|
+  t.test_globs = ["test/**/*_test.rb"]
+end
 
 task default: :test