Increase coverage with additional test.
Increase coverage with additional test.

nickerso/libcellml,cellml/libcellml,hsorby/libcellml,cellml/libcellml,nickerso/libcellml,nickerso/libcellml,nickerso/libcellml,cellml/libcellml,hsorby/libcellml,cellml/libcellml,hsorby/libcellml,hsorby/libcellml