diff --git a/tests/test_grpc.py b/tests/test_grpc.py
index 808de4afab..6d0aaf6fc2 100644
--- a/tests/test_grpc.py
+++ b/tests/test_grpc.py
@@ -25,6 +25,7 @@
 import re
 import shutil
 import sys
+from unittest.mock import patch
 
 import grpc
 import pytest
@@ -682,3 +683,32 @@ def _null_close_process():
         mapdl.prep7(mapdl)
 
     mapdl._exited = False  # Restoring
+
+
+@pytest.mark.parametrize("platform", ["linux", "windows", "error"])
+def test__get_time_step_stream(mapdl, platform):
+    with patch("ansys.mapdl.core.mapdl_grpc.MapdlGrpc.platform", platform):
+        from ansys.mapdl.core import mapdl_grpc
+
+        if platform == "linux":
+            DEFAULT_TIME_STEP_STREAM = mapdl_grpc.DEFAULT_TIME_STEP_STREAM_POSIX
+        elif platform == "windows":
+            DEFAULT_TIME_STEP_STREAM = mapdl_grpc.DEFAULT_TIME_STEP_STREAM_NT
+        else:
+            with pytest.raises(ValueError, match="The MAPDL platform"):
+                mapdl._get_time_step_stream()
+
+            return  # Early exit
+
+        assert DEFAULT_TIME_STEP_STREAM == mapdl._get_time_step_stream()
+
+        mapdl_grpc.DEFAULT_TIME_STEP_STREAM = 200
+        assert mapdl_grpc.DEFAULT_TIME_STEP_STREAM == mapdl._get_time_step_stream()
+        mapdl_grpc.DEFAULT_TIME_STEP_STREAM = None
+
+        assert 700 == mapdl._get_time_step_stream(700)
+
+        with pytest.raises(
+            ValueError, match="``time_step`` argument must be greater than 0``"
+        ):
+            mapdl._get_time_step_stream(-700)