rails/rails — pull request #6396 by kennyj (2012-05-19 15:16:34+00:00)
Title: Don't use assert_block method. It will be deprecated.

I found the following output in the Travis.

```
...
.NOTE: MiniTest::Unit::TestCase#assert_block is deprecated, use assert. It will be removed on or after 2012-06-01. Called from /home/vagrant/builds/rails/rails/activesupport/test/ts_isolated.rb:13:in `block (2 levels) in '
...
```