How to run rake with rspec with Rails ( anti LoadError: Can't find )

rake

/app/lib/tasks/foo/bar.rake

namespace :foo do
  task bar: :environment do |task|
    SomeClass.run
  end
end

rspec

require "rails_helper"
require "rake"

describe do
  before(:all) do
    @rake = Rake::Application.new
    Rake.application = @rake

    # This line require file e.g '/app/lib/tasks/foo/bar.rake'
    Rake.application.rake_require('bar', [Rails.root.join('lib', 'tasks', 'foo')])

    Rake::Task.define_task(:environment)
  end

  before(:each) do
    @rake[task].reenable
  end

  describe  do
    # Do not use dot
    # BAD CASE : foo.bar 
    let(:task) { 'foo:bar' }

    it do
      expect(SomeClass).to receive(:run)
      @rake[task].invoke
    end
  end
end

Doc

https://apidock.com/ruby/v1_9_3_392/Rake/Application/rake_require

File lib/rake/application.rb, line 452

def rake_require(file_name, paths=$LOAD_PATH, loaded=$")
  fn = file_name + ".rake"
  return false if loaded.include?(fn)
  paths.each do |path|
    full_path = File.join(path, fn)
    if File.exist?(full_path)
      Rake.load_rakefile(full_path)
      loaded << fn
      return true
    end
  end
  fail LoadError, "Can't find #{file_name}"
end

Ref

Rspecでrake taskをテストする方法　 - Qiita
Rakeタスクのテストの仕方 - Qiita
[Ruby on Rails]RSpecによるRakeのテスト ｜ Developers.IO

Original by Github issue

https://github.com/YumaInaura/YumaInaura/issues/2768

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公開日時

2019-11-25