Merge branch 'fc/rev-parse-test-updates'

Modernize tests.

* fc/rev-parse-test-updates:
  rev-parse test: use standard test functions for setup
  rev-parse test: use test_cmp instead of "test" builtin
  rev-parse test: use test_must_fail, not "if <command>; then false; fi"
  rev-parse test: modernize quoting and whitespace