check hint nc_header_collective

Author: wkliao

test/testcases/tst_info.c

@@ -110,6 +110,7 @@ int main(int argc, char** argv) {
     MPI_Info_create(&info);
     MPI_Info_set(info, "nc_header_align_size", "1");   /* size in bytes */
     MPI_Info_set(info, "nc_var_align_size",    "197"); /* size in bytes */
+    MPI_Info_set(info, "nc_header_collective", "true");
 
     /* create another new file using a non-NULL MPI info --------------------*/
     err = ncmpi_create(MPI_COMM_WORLD, filename, NC_CLOBBER, info, &ncid2); CHECK_ERR
@@ -191,6 +192,19 @@ int main(int argc, char** argv) {
         }
     }
 
+    MPI_Info_get_valuelen(info_used, "nc_header_collective", &len, &flag);
+    if (flag) {
+        MPI_Info_get(info_used, "nc_header_collective", len+1, value, &flag);
+        if (strcasecmp("true", value)) {
+            printf("Error: nc_header_collective expect \"true\" but got \"%s\"\n",
+                   value);
+            nerrs++;
+        }
+    } else {
+        printf("Error: hint \"nc_header_collective\" is missing\n");
+        nerrs++;
+    }
+
     MPI_Info_get_valuelen(info_used, "pnetcdf_subfiling", &len, &flag);
     if (flag) {
         MPI_Info_get(info_used, "pnetcdf_subfiling", len+1, value, &flag);