Generator test: slight improvements to our algebraic_eqn_derivative_on_rhs_one_component test.
Generator test: slight improvements to our algebraic_eqn_derivative_on_rhs_one_component test.

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