Add missing test to satisfy use cases.
Add missing test to satisfy use cases.

hsorby/libcellml,nickerso/libcellml,MichaelClerx/libcellml,hsorby/libcellml,MichaelClerx/libcellml,libcellml/buildbot-testing,cellml/libcellml,nickerso/libcellml,hsorby/libcellml,cellml/libcellml,hsorby/libcellml,nickerso/libcellml,libcellml/buildbot-testing,cellml/libcellml,MichaelClerx/libcellml,cellml/libcellml,nickerso/libcellml