Allow MPI_PROC_NULL for RMA tests

scripts/errors/rma/InvalidRank.py

@@ -10,7 +10,8 @@ from Infrastructure.TemplateFactory import get_invalid_param_rma_case
 
 
 class InvalidRankErrorRMA(ErrorGenerator):
-    invalid_ranks = ["-1", "nprocs", "MPI_PROC_NULL"]
+    invalid_ranks = ["-1", "nprocs"]
+    correct_ranks = ["MPI_PROC_NULL"]
 
     def __init__(self):
         pass
@@ -33,3 +34,8 @@ class InvalidRankErrorRMA(ErrorGenerator):
                 tm.set_description("InvalidParam-Rank",
                                 "Invalid Rank: %s" % rank_to_use)
                 yield tm
+            for rank_to_use in self.correct_ranks:
+                tm = get_invalid_param_rma_case("target_rank", func, rank_to_use)
+                tm.set_description("Correct-Rank",
+                                f"Use of special rank {rank_to_use} in valid communication call")
+                yield tm