  Ontology development relates to software development in that they both
involve the production of formal computational knowledge. It is possible,
therefore, that some of the techniques used in software engineering could also
be used for ontologies; for example, in software engineering testing is a
well-established process, and part of many different methodologies.
  The application of testing to ontologies, therefore, seems attractive. The
Karyotype Ontology is developed using the novel Tawny-OWL library. This
provides a fully programmatic environment for ontology development, which
includes a complete test harness.
  In this paper, we describe how we have used this harness to build an
extensive series of tests as well as used a commodity continuous integration
system to link testing deeply into our development process; this environment,
is applicable to any OWL ontology whether written using Tawny-OWL or not.
Moreover, we present a novel analysis of our tests, introducing a new
classification of what our different tests are. For each class of test, we
describe why we use these tests, also by comparison to software tests. We
believe that this systematic comparison between ontology and software
development will help us move to a more agile form of ontology development.
