diff --git a/test/validation/items/common/helper_lib.py b/test/validation/items/common/helper_lib.py
new file mode 100644
index 0000000..dba98b7
--- /dev/null
+++ b/test/validation/items/common/helper_lib.py
@@ -0,0 +1,29 @@
+import libs.testium as libtm
+
+
+def check_os(expected_os):
+    result = libtm.OS()
+    assert result == expected_os, f"Expected {expected_os!r}, got {result!r}"
+    return 0
+
+
+def check_get_main_dir():
+    d = libtm.get_main_dir()
+    assert isinstance(d, str) and len(d) > 0
+    return 0
+
+
+def check_timestamp_as_sec_conversion():
+    assert libtm.timestamp_as_sec(0) == 0.0
+    assert libtm.timestamp_as_sec(10000) == 1.0
+    assert libtm.timestamp_as_sec(5000) == 0.5
+    return 0
+
+
+def check_timestamp():
+    libtm.init_timestamp()
+    t = libtm.timestamp()
+    assert isinstance(t, int) and t >= 0
+    ts = libtm.timestamp_as_sec()
+    assert isinstance(ts, float) and ts >= 0.0
+    return 0
diff --git a/test/validation/items/common/test.tum b/test/validation/items/common/test.tum
index fe5f458..8900f7c 100644
--- a/test/validation/items/common/test.tum
+++ b/test/validation/items/common/test.tum
@@ -9,4 +9,29 @@
 - group:
     name : Various syntax robustness
     steps:
-        - !include syntax_robustness/test.tum
\ No newline at end of file
+        - !include syntax_robustness/test.tum
+- group:
+    name: Helper lib functions
+    steps:
+        - py_func:
+            name: OS
+            key: $(test)_PASS
+            file: $(test_path)$(psep)helper_lib.py
+            func_name: check_os
+            param:
+                - $(os)
+        - py_func:
+            name: get_main_dir
+            key: $(test)_PASS
+            file: $(test_path)$(psep)helper_lib.py
+            func_name: check_get_main_dir
+        - py_func:
+            name: timestamp_as_sec conversion
+            key: $(test)_PASS
+            file: $(test_path)$(psep)helper_lib.py
+            func_name: check_timestamp_as_sec_conversion
+        - py_func:
+            name: timestamp and timestamp_as_sec
+            key: $(test)_PASS
+            file: $(test_path)$(psep)helper_lib.py
+            func_name: check_timestamp
\ No newline at end of file