We use Rake::TestTask to create a new task. This task will also run the db:test:prepare task so that we don’t need to worry about running it manually when we create further migrations. The code for this task adds the test directory to the load paths and then runs any file under the test directory whose filename ends in _test.rb. Finally we set t…

minitest.rake

# /lib/tasks/minitest.rake
require "rake/testtask"

Rake::TestTask.new(:test => "db:test:prepare") do |t|
  t.libs << "test"
  t.pattern = "test/**/*_test.rb"
end

task :default => :test