Speculate about implementation of some header-munging features
Note that include takes an array after 3.0
Note that aliases don't work with the defined function
Late 2012: A bunch of Hiera tests, mostly involving odd data types.
Late 2012: Test automatic parameter lookup with Hiera and ENCs

Finding things like selective autolookup for resource-like class instantiation.
Fun with aliases
An ugly problem involving relative namespacing and conditional resources.
Testing valid number formats.
Testing what happens with files without ensure values
Miscellaneous Puppet 3 changes and non-changes
Test some of those special template vars, to confirm parse-order dependence
Some examples of perfectly normal behavior.