Add executable with Thor

README.md

@@ -37,10 +37,9 @@ GoodJob is a multithreaded, Postgres-based ActiveJob backend for Ruby on Rails.
     ```
 
 1. In production, the scheduler is designed to run in its own process:
-
-```ruby
-# TBD
-```
+    ```bash
+    $ bundle exec good_job
+    ```
 
 ## Installation
 Add this line to your application's Gemfile:

bin/good_job

@@ -0,0 +1,3 @@
+#!/usr/bin/env ruby
+require 'good_job/cli'
+GoodJob::CLI.start(ARGV)

good_job.gemspec

@@ -24,9 +24,12 @@ Gem::Specification.new do |spec|
   end
 
   spec.files = Dir["{app,config,db,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]
+  spec.executables = "good_job"
 
-  spec.add_dependency "rails", "~> 6.0.2", ">= 6.0.2.1"
+  spec.add_dependency "concurrent-ruby"
+  spec.add_dependency "rails"
+  spec.add_dependency "thor"
+  spec.add_development_dependency "database_cleaner"
   spec.add_development_dependency "pg"
   spec.add_development_dependency "rspec-rails"
-  spec.add_development_dependency "database_cleaner"
 end

lib/good_job.rb

@@ -1,4 +1,4 @@
-require "good_job/railtie"
+require "rails"
 
 require 'good_job/lockable'
 require 'good_job/job'

lib/good_job/cli.rb

@@ -0,0 +1,19 @@
+require 'thor'
+
+module GoodJob
+  class CLI < Thor
+    RAILS_ENVIRONMENT_RB = File.expand_path("config/environment.rb")
+
+    desc :start, "Start jobs"
+    def start
+      require RAILS_ENVIRONMENT_RB
+
+      scheduler = GoodJob::Scheduler.new
+      Kernel.loop do
+        sleep 1
+      end
+    end
+
+    default_task :start
+  end
+end

spec/good_job/cli_spec.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+require 'rails_helper'
+require 'good_job/cli'
+
+RSpec.describe GoodJob::CLI do
+  before do
+    stub_const 'GoodJob::CLI::RAILS_ENVIRONMENT_RB', File.expand_path("spec/dummy/config/environment.rb")
+  end
+
+  describe '#start' do
+    it 'initializes a scheduler' do
+      scheduler_mock = instance_double GoodJob::Scheduler
+      allow(GoodJob::Scheduler).to receive(:new).and_return scheduler_mock
+      allow(Kernel).to receive(:loop)
+
+      cli = described_class.new([], {}, {})
+      cli.start
+
+      expect(GoodJob::Scheduler).to have_received(:new)
+    end
+  end
+end

spec/good_job/scheduler_spec.rb

@@ -30,7 +30,7 @@ def perform(*args, **kwargs)
       self.queue_name = 'test'
       self.priority = 50
       retry_on(RetryableError, wait: 0, attempts: 3) do |job, error|
-        puts "FAILED"
+        # puts "FAILED"
       end
 
       def perform(*args, **kwargs)