Inline Bundler for single file Ruby scripts

October 4, 2020 One-minute read

ruby • development • productivity

To set up Gemfile functionality do this:

#!/usr/bin/env ruby
# frozen_string_literal: true

ENV['GEM_HOME'] = File.join(Dir.pwd, 'vendor', 'ruby')
Gem.clear_paths

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'

  gem 'minitest'
end

Now you can define and test your code in the same file:

def quick_maths(a, b)
  a + b
end

require 'minitest/autorun'

describe '#quick_maths' do
  it '1 + 1 = 2' do
    assert_equal(2, quick_maths(1, 1))
  end
end