Merge branch 'sk/unit-tests-0130'

Convert a handful of unit tests to work with the clar framework.

* sk/unit-tests-0130:
  t/unit-tests: convert strcmp-offset test to use clar test framework
  t/unit-tests: convert strbuf test to use clar test framework
  t/unit-tests: adapt example decorate test to use clar test framework
  t/unit-tests: convert hashmap test to use clar test framework

diff --cc Makefile
Simple merge