Add specs for new BatchUpdateJob
user
```ruby
require 'spec_helper'

describe BatchUpdateJob do
  before(:all) do
    GenericFile.any_instance.stubs(:terms_of_service).returns('1')
    @user = FactoryGirl.find_or_create(:user)
    @batch = Batch.new
    @batch.save
    @file = GenericFile.new(:batch=>@batch)
    @file.apply_depositor_metadata(@user.login)
    @file.save
    @file2 = GenericFile.new(:batch=>@batch)
    @file2.apply_depositor_metadata('otherUser')
    @file2.save
  end
  after(:all) do
    # clear any existing messages
    @batch.delete
    @user.delete
    @file.delete
    @file2.delete
  end
  describe "failing update" do
    it "should check permissions for each file before updating" do
      BatchUpdateJob.any_instance.stubs(:get_permissions_solr_response_for_doc_id).returns(["","mock solr permissions"])       
      User.any_instance.expects(:can?).with(:edit, "mock solr permissions").times(2)
      params = {'generic_file' => {'terms_of_service' => '1', 'read_groups_string' => '', 'read_users_string' => 'archivist1, archivist2', 'tag' => ['']}, 'id' => @batch.pid, 'controller' => 'batch', 'action' => 'update'}
      BatchUpdateJob.perform(@user.login, params)
      #b = Batch.find(@batch.pid)
    end
  end
  describe "passing update" do
    it "should log a content update event" do
      BatchUpdateJob.any_instance.stubs(:get_permissions_solr_response_for_doc_id).returns(["","mock solr permissions"])       
      User.any_instance.expects(:can?).with(:edit, "mock solr permissions").times(2).returns(true)
      Resque.expects(:enqueue).with(ContentUpdateEventJob, @file.pid, @user.login).once
      Resque.expects(:enqueue).with(ContentUpdateEventJob, @file2.pid, @user.login).once
      params = {'generic_file' => {'terms_of_service' => '1', 'read_groups_string' => '', 'read_users_string' => 'archivist1, archivist2', 'tag' => ['']}, 'id' => @batch.pid, 'controller' => 'batch', 'action' => 'update'}
      BatchUpdateJob.perform(@user.login, params)
    end
  end
end
```
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