fix unit tests

test/unit/bulk_revert_test.rb

@@ -3,10 +3,12 @@ require 'test_helper'
 class BulkRevertTest < ActiveSupport::TestCase
   context "#find_post_versions" do
     subject do
-      BulkRevert.new(added_tags: "hoge")
+      @user = FactoryGirl.create(:user)
+      BulkRevert.new
     end
 
     setup do
+      subject.stubs(:constraints).returns({added_tags: ["a"]})
       subject.expects(:query_gbq).returns([1,2,3])
     end