We recently discovered that default_url_options are not honored in functional and integration tests, and I dug up this patch by gcnovus that fixes it. I've done a tad bit of cleanup, verified it against edge, and am now soliciting for verifiers:
http://dev.rubyonrails.org/ticket/8836
Thanks!
FYI, this wasn't actually helping integration tests (since within an integration test you can generate urls independent of a controller). I just uploaded a new patch that adds the ability to define default_url_options either within your IntegrationTest or on an individual session, and all rewriting that happens independent of a controller will then honor those options.
Can I get some verification love?
P.S. Not naming any names, but since 7724 I'm getting an error in FragmentCacheStoreSettingTest#test_mem_cache_fragment_cache_store...