Removed explicit references to p->rho_dh in the test27 and testPair unit tests...

Removed explicit references to p->rho_dh in the test27 and testPair unit tests as these might not exist in all hydro schemes.

src/tools.c

@@ -519,7 +519,8 @@ void engine_single_density(double *dim, long long int pid,
 
   /* Dump the result. */
   hydro_end_density(&p, 0);
-  message("part %lli (h=%e) has wcount=%e, rho=%e.", p.id, p.h, p.density.wcount, p.rho);
+  message("part %lli (h=%e) has wcount=%e, rho=%e.", p.id, p.h,
+          p.density.wcount, p.rho);
   fflush(stdout);
 }
 

tests/test27cells.c

@@ -147,8 +147,6 @@ void clean_up(struct cell *ci) {
  */
 void zero_particle_fields(struct cell *c) {
   for (size_t pid = 0; pid < c->count; pid++) {
-    c->parts[pid].rho = 0.f;
-    c->parts[pid].rho_dh = 0.f;
     hydro_init_part(&c->parts[pid]);
   }
 }
@@ -187,7 +185,12 @@ void dump_particle_fields(char *fileName, struct cell *main_cell,
             main_cell->parts[pid].x[1], main_cell->parts[pid].x[2],
             main_cell->parts[pid].v[0], main_cell->parts[pid].v[1],
             main_cell->parts[pid].v[2], main_cell->parts[pid].rho,
-            main_cell->parts[pid].rho_dh, main_cell->parts[pid].density.wcount,
+#if defined(GIZMO_SPH)
+            0.f,
+#else
+            main_cell->parts[pid].rho_dh,
+#endif
+            main_cell->parts[pid].density.wcount,
             main_cell->parts[pid].density.wcount_dh,
 #if defined(GADGET2_SPH)
             main_cell->parts[pid].density.div_v,
@@ -223,7 +226,12 @@ void dump_particle_fields(char *fileName, struct cell *main_cell,
               "%13e %13e %13e\n",
               cj->parts[pjd].id, cj->parts[pjd].x[0], cj->parts[pjd].x[1],
               cj->parts[pjd].x[2], cj->parts[pjd].v[0], cj->parts[pjd].v[1],
-              cj->parts[pjd].v[2], cj->parts[pjd].rho, cj->parts[pjd].rho_dh,
+              cj->parts[pjd].v[2], cj->parts[pjd].rho,
+#if defined(GIZMO_SPH)
+              0.f,
+#else
+              main_cell->parts[pjd].rho_dh,
+#endif
               cj->parts[pjd].density.wcount, cj->parts[pjd].density.wcount_dh,
 #if defined(GADGET2_SPH)
               cj->parts[pjd].density.div_v, cj->parts[pjd].density.rot_v[0],

tests/testPair.c

@@ -106,8 +106,6 @@ void clean_up(struct cell *ci) {
  */
 void zero_particle_fields(struct cell *c) {
   for (size_t pid = 0; pid < c->count; pid++) {
-    c->parts[pid].rho = 0.f;
-    c->parts[pid].rho_dh = 0.f;
     hydro_init_part(&c->parts[pid]);
   }
 }
@@ -133,9 +131,14 @@ void dump_particle_fields(char *fileName, struct cell *ci, struct cell *cj) {
             "%13e %13e %13e\n",
             ci->parts[pid].id, ci->parts[pid].x[0], ci->parts[pid].x[1],
             ci->parts[pid].x[2], ci->parts[pid].v[0], ci->parts[pid].v[1],
-            ci->parts[pid].v[2], ci->parts[pid].rho, ci->parts[pid].rho_dh,
+            ci->parts[pid].v[2], ci->parts[pid].rho,
+#if defined(GIZMO_SPH)
+            0.f,
+#else
+            cj->parts[pid].rho_dh,
+#endif
             ci->parts[pid].density.wcount, ci->parts[pid].density.wcount_dh,
-#ifdef GADGET2_SPH
+#if defined(GADGET2_SPH) || defined(DEFAULT_SPH)
             ci->parts[pid].density.div_v, ci->parts[pid].density.rot_v[0],
             ci->parts[pid].density.rot_v[1], ci->parts[pid].density.rot_v[2]
 #else
@@ -152,9 +155,14 @@ void dump_particle_fields(char *fileName, struct cell *ci, struct cell *cj) {
             "%13e %13e %13e\n",
             cj->parts[pjd].id, cj->parts[pjd].x[0], cj->parts[pjd].x[1],
             cj->parts[pjd].x[2], cj->parts[pjd].v[0], cj->parts[pjd].v[1],
-            cj->parts[pjd].v[2], cj->parts[pjd].rho, cj->parts[pjd].rho_dh,
+            cj->parts[pjd].v[2], cj->parts[pjd].rho,
+#if defined(GIZMO_SPH)
+            0.f,
+#else
+            cj->parts[pjd].rho_dh,
+#endif
             cj->parts[pjd].density.wcount, cj->parts[pjd].density.wcount_dh,
-#ifdef GADGET2_SPH
+#if defined(GADGET2_SPH) || defined(DEFAULT_SPH)
             cj->parts[pjd].density.div_v, cj->parts[pjd].density.rot_v[0],
             cj->parts[pjd].density.rot_v[1], cj->parts[pjd].density.rot_v[2]
 #else