Fixing the model tests to that they pass for the changes from #168, and updating the CHANGELOG.

CHANGELOG.md

@@ -7,5 +7,7 @@
     if attribute value is changing.
   - [#173](https://github.com/airblade/paper_trail/pull/173) - Update link to [diff-lcs](https://github.com/halostatue/diff-lcs).
   - [#172](https://github.com/airblade/paper_trail/pull/172) - Save `object_changes` on creation.
+  - [#168](https://github.com/airblade/paper_trail/pull/168) - Respect conditional `:if` or `:unless` arguments to the
+    `has_paper_trail` method for `destroy` events.
   - [#167](https://github.com/airblade/paper_trail/pull/167) - Fix `originator` method so that it works with subclasses and STI.
   - [#160](https://github.com/airblade/paper_trail/pull/160) - Fixed failing tests and resolved out of date dependency issues.

test/unit/model_test.rb

@@ -81,12 +81,8 @@ class HasPaperTrailModelTest < ActiveSupport::TestCase
       end
 
       context 'after destroy' do
-        setup do
-          @translation.save!
-          @translation.destroy
-        end
-
-        should_not_change('the number of versions') { Version.count }
+        setup { @translation.destroy }
+        should 'not change the number of versions' do assert_equal(0, Version.count) end
       end
     end
 
@@ -118,12 +114,8 @@ class HasPaperTrailModelTest < ActiveSupport::TestCase
         end
 
         context 'after destroy' do
-          setup do
-            @translation.save!
-            @translation.destroy
-          end
-
-          should_change('the number of versions', :by => 1) { Version.count }
+          setup { @translation.destroy }
+          should 'change the number of versions' do assert_equal(2, Version.count) end
         end
       end
     end