Fix Scheduler integration spec to ensure jobs are run in the Schedule…

…r under test (#276)

spec/integration/scheduler_spec.rb

@@ -1,6 +1,8 @@
 require 'rails_helper'
 
 RSpec.describe 'Schedule Integration' do
+  let(:adapter) { GoodJob::Adapter.new(execution_mode: :external) }
+
   before do
     ActiveJob::Base.queue_adapter = adapter
 
@@ -38,15 +40,15 @@ def perform(*args, **kwargs)
     end), transfer_nested_constants: true
   end
 
-  let(:adapter) { GoodJob::Adapter.new }
-
   context 'when there are a large number of jobs' do
     let(:number_of_jobs) { 500 }
     let(:max_threads) { 5 }
 
     let!(:good_jobs) do
-      number_of_jobs.times do |i|
-        ExampleJob.perform_later(i)
+      GoodJob::Job.transaction do
+        number_of_jobs.times do |i|
+          ExampleJob.perform_later(i)
+        end
       end
     end
 
@@ -77,8 +79,10 @@ def perform(*args, **kwargs)
     let(:number_of_jobs) { 50 }
 
     let!(:good_jobs) do
-      number_of_jobs.times do |i|
-        ExampleJob.perform_later(i)
+      GoodJob::Job.transaction do
+        number_of_jobs.times do |i|
+          ExampleJob.perform_later(i)
+        end
       end
     end
 
@@ -117,6 +121,7 @@ def perform(*args, **kwargs)
     it 'warms up and schedules them in a cache' do
       performer = GoodJob::JobPerformer.new('*')
       scheduler = GoodJob::Scheduler.new(performer, max_threads: 5, max_cache: 5)
+      scheduler.warm_cache
       sleep_until(max: 5, increments_of: 0.5) { GoodJob::Job.count == 0 }
       scheduler.shutdown
     end