$ rake synthesis:test
(in /Users/david/projects/ruby/tmp/synth)
[Synthesis] Collecting expectations...
..

Finished in 0.003435 seconds

2 examples, 0 failures
[Synthesis] Verifying expectation invocations...
..

Finished in 0.001284 seconds

2 examples, 0 failures
[Synthesis]
[Synthesis] Tested Expectations:
[Synthesis]
[Synthesis] Untested Expectations:
() Person.new.hello() in ./example.rb:11
[Synthesis] Ignoring:
[Synthesis]
[Synthesis] FAILED.