Use database_cleaner in specs

Rakefile

@@ -28,6 +28,7 @@ Jeweler::Tasks.new do |s|
   s.add_development_dependency "dm-observer"
   s.add_development_dependency "dm-aggregates"
   s.add_development_dependency "do_sqlite3"
+  s.add_development_dependency "database_cleaner"
 end
 
 require 'spec/rake/spectask'

spec/backend/active_record_job_spec.rb

@@ -8,8 +8,6 @@
   end
 
   before(:each) do
-    Delayed::Worker.max_priority = nil
-    Delayed::Worker.min_priority = nil
     Delayed::Job.delete_all
     SimpleJob.runs = 0
   end

spec/backend/shared_backend_spec.rb

@@ -4,6 +4,8 @@ def create_job(opts = {})
   end
 
   before do
+    Delayed::Worker.max_priority = nil
+    Delayed::Worker.min_priority = nil
     SimpleJob.runs = 0
   end
 

spec/spec_helper.rb

@@ -6,13 +6,16 @@
 
 require 'delayed_job'
 require 'sample_jobs'
+require 'database_cleaner'
 
 Delayed::Worker.logger = Logger.new('/tmp/dj.log')
 
-BACKENDS = [:active_record, :mongo_mapper]
+BACKENDS = [:active_record, :mongo_mapper, :data_mapper]
 
 BACKENDS.each do |backend|
   require "setup/#{backend}"
 end
 
 Delayed::Worker.backend = BACKENDS.first
+DatabaseCleaner.orm = BACKENDS.first.to_s
+DatabaseCleaner.strategy = :truncation

spec/worker_spec.rb

@@ -23,7 +23,8 @@ def job_create(opts = {})
     describe "with the #{backend} backend" do
       before do
         Delayed::Worker.backend = backend
-        Delayed::Job.delete_all
+        DatabaseCleaner.orm = backend.to_s
+        DatabaseCleaner.clean
 
         @worker = Delayed::Worker.new(:max_priority => nil, :min_priority => nil, :quiet => true)