Index: functional/issues_controller_test.rb
===================================================================
--- functional/issues_controller_test.rb	(revision 19626)
+++ functional/issues_controller_test.rb	(working copy)
@@ -2525,6 +2525,7 @@
   end
 
   def test_show_with_thumbnails_enabled_should_display_thumbnails
+    skip unless convert_installed?
     @request.session[:user_id] = 2
     with_settings :thumbnails_enabled => '1' do
       get(:show, :params => {:id => 14})
Index: helpers/journals_helper_test.rb
===================================================================
--- helpers/journals_helper_test.rb	(revision 19626)
+++ helpers/journals_helper_test.rb	(working copy)
@@ -32,6 +32,7 @@
            :versions
 
   def test_journal_thumbnail_attachments_should_return_thumbnailable_attachments
+    skip unless convert_installed?
     set_tmp_attachments_directory
     issue = Issue.generate!
 
Index: integration/api_test/attachments_test.rb
===================================================================
--- integration/api_test/attachments_test.rb	(revision 19626)
+++ integration/api_test/attachments_test.rb	(working copy)
@@ -50,6 +50,7 @@
   end
 
   test "GET /attachments/:id.xml for image should include thumbnail_url" do
+    skip unless convert_installed?
     get '/attachments/16.xml', :headers => credentials('jsmith')
     assert_response :success
     assert_equal 'application/xml', @response.media_type
Index: unit/attachment_test.rb
===================================================================
--- unit/attachment_test.rb	(revision 19626)
+++ unit/attachment_test.rb	(working copy)
@@ -444,6 +444,7 @@
   end
 
   def test_thumbnailable_should_be_true_for_images
+    skip unless convert_installed?
     assert_equal true, Attachment.new(:filename => 'test.jpg').thumbnailable?
   end