Cover both density mass and EOS source in closure quadrature

libmeanfield/impl/operators/kernels/barotropic_closure_kernels.cpp

@@ -102,7 +102,18 @@ namespace {
                 mean_field::quadrature::MappingKind::general
             );
 
-        const auto resolution = f.quadratureFactory->get(query, transformation.GetGeometryType());
+        const auto sourceResolution = f.quadratureFactory->get(query, transformation.GetGeometryType());
+        // The reference kernel must also cover the density mass degree when
+        // density is enriched independently of the EOS source field.
+        const auto massQuery = mean_field::field::Field<mean_field::field::Density>::make_query<
+            mean_field::field::Density::Form::EosClosureMass>(
+            mean_field::quadrature::QuadratureRole::discretization, transformation.OrderW(), {},
+            mean_field::utils::DOMAINS::STELLAR, mean_field::quadrature::MappingKind::general
+        );
+        const auto massResolution = f.quadratureFactory->get(massQuery, transformation.GetGeometryType());
+        const auto &resolution = sourceResolution.resolution.order >= massResolution.resolution.order
+                                     ? sourceResolution
+                                     : massResolution;
 
         MFEM_VERIFY(
             resolution.integration_rule != nullptr, "The quadrature policy did not return an "