A poster child for TDD ...or perhaps more caffeine for finishing off those pesky tests required by the core team!
In view/test_case_test.rb there are several assertions of this form:
assert 'Holla!', from_shared_helper
I've created a patch that makes more meaningful assertions. For example:
assert_equal 'Holla!', from_shared_helper
The patch applies to 2-3-stable.
Looking for reviewers here: #3468 Some assertions for the testing of ActionView::TestCase are worthless - Ruby on Rails - rails
Good news: after strengthening the assertions, all tests still pass. At least on 2-3-stable.