ruby - Rake test not working in Rails app -

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i'm trying run minitests in rails library app, when run rake test, error saying loaderror: cannot load such file -- rake/testtask.

here rakefile:

require "bundler" bundler.setup  require 'rake/testtask'  desc 'test library.' rake::testtask.new(:test) |t|   t.libs << 'lib' << 'test'   t.pattern = 'test/**/*_test.rb'   t.verbose = true end

below gemfile:

source 'https://rubygems.org'  gemspec  gem 'minitest' gem 'htmlentities' gem 'aws-s3' gem 'byebug', platforms: :mri gem 'rake'

rake not being loaded. add gem 'rake' gemfile


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