This tool can test a spec based on a test definition.
For example, see specs/test/double.test.yaml, which specifies one set of tests for the spec specs/double.yaml.
This tool will invoke mcrew, so you'll need to
build that program first.
From this directory:
(cd ../mcrew && go install) # If you haven't already
go install
mexpect -f ../../specs/tests/double.test.yaml -s ../../specs