2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/174073We give a set of test functions for the interpolation problem on $H_1^\infty$ , the constrained interpolation problem studied by Davidson, Paulsen, Raghupathi and Singh. We show that this set of test functions is minimal.Functional Analysis47A57 (Primary) 32C15, 46E20, 46E22, 47B32 (Secondary)text