fix tests

test/unit/post_archive_test.rb

@@ -24,7 +24,7 @@ class PostArchiveTest < ActiveSupport::TestCase
         @post.update_attributes(:tag_string => "2 3")
       end
 
-      subject { @post.versions[1] }
+      subject { @post.versions.sort_by(&:id)[1] }
 
       should "undo the changes" do
         subject.undo!
@@ -61,7 +61,7 @@ class PostArchiveTest < ActiveSupport::TestCase
 
       should "also create a version" do
         assert_equal(1, @post.versions.size)
-        @version = @post.versions.last
+        @version = @post.versions.sort_by(&:id).last
         assert_equal("aaa bbb ccc", @version.tags)
         assert_equal(@post.rating, @version.rating)
         assert_equal(@post.parent_id, @version.parent_id)
@@ -93,7 +93,7 @@ class PostArchiveTest < ActiveSupport::TestCase
         @post.update_attributes(:tag_string => "bbb ccc xxx", :source => "")
 
         assert_equal(2, @post.versions.size)
-        @version = @post.versions.last
+        @version = @post.versions.sort_by(&:id).last
         assert_equal("bbb ccc xxx", @version.tags)
         assert_equal("q", @version.rating)
         assert_equal("", @version.source)
@@ -110,14 +110,14 @@ class PostArchiveTest < ActiveSupport::TestCase
       should "should create a version if the rating changes" do
         assert_difference("@post.versions.size", 1) do
           @post.update(rating: "s")
-          assert_equal("s", @post.versions.last.rating)
+          assert_equal("s", @post.versions.sort_by(&:id).last.rating)
         end
       end
 
       should "should create a version if the source changes" do
         assert_difference("@post.versions.size", 1) do
           @post.update(source: "blah")
-          assert_equal("blah", @post.versions.last.source)
+          assert_equal("blah", @post.versions.sort_by(&:id).last.source)
         end
       end
 
@@ -125,14 +125,14 @@ class PostArchiveTest < ActiveSupport::TestCase
         assert_difference("@post.versions.size", 1) do
           @parent = FactoryGirl.create(:post)
           @post.update(parent_id: @parent.id)
-          assert_equal(@parent.id, @post.versions.last.parent_id)
+          assert_equal(@parent.id, @post.versions.sort_by(&:id).last.parent_id)
         end
       end
 
       should "should create a version if the tags change" do
         assert_difference("@post.versions.size", 1) do
           @post.update(tag_string: "blah")
-          assert_equal("blah", @post.versions.last.tags)
+          assert_equal("blah", @post.versions.sort_by(&:id).last.tags)
         end
       end
     end