Code review comment for lp:~oif-team/geis/tdd-harness

* check also supports suites, including nested suites and per-suite fixture setup/teardown
* cunit is a port of the massive Java JUnit framework, it's a rather overengineered solution to a simple problem
* check forks tests, cunit doesn't -- meaning a single crash causes the entire run to fail instead of reporting errors
* check only emits results, it doesn't come with an embedded gui runner

In short, check is a smaller and lighter yet complete (for our purposes) unit test framework.