Fix test_check_show_lpmode case (sonic-net#15062)

Author: weiguo-nvidia

tests/platform_tests/sfp/test_show_intf_xcvr.py

@@ -83,7 +83,19 @@ def test_check_show_lpmode(duthosts, enum_rand_one_per_hwsku_frontend_hostname,
         return
     assert sfp_lpmode['rc'] == 0, "Run command '{}' failed".format(cmd_sfp_presence)
 
+    sfp_lpmode_data = sfp_lpmode["stdout_lines"]
+
+    # Check if the header is present
+    header = sfp_lpmode_data[0]
+    logging.info(f"The header is: {header}")
+    if header.replace(" ", "") != "Port        Low-power Mode".replace(" ", ""):
+        logging.error("Invalid output format: Header missing")
+        return False
+
+    # Check interface lpmode
+    sfp_lpmode_info = parse_output(sfp_lpmode_data[2:])
+    logging.info(f"The interface sfp lpmode info is: {sfp_lpmode_info}")
     for intf in dev_conn:
         if intf not in xcvr_skip_list[duthost.hostname]:
             assert validate_transceiver_lpmode(
-                sfp_lpmode['stdout']), "Interface mode incorrect in 'show interface transceiver lpmode'"
+                sfp_lpmode_info, intf), "Interface mode incorrect in 'show interface transceiver lpmode'"

tests/platform_tests/sfp/util.py

@@ -47,15 +47,14 @@ def get_dev_conn(duthost, conn_graph_facts, asic_index):
     return portmap, dev_conn
 
 
-def validate_transceiver_lpmode(output):
-    lines = output.strip().split('\n')
-    # Check if the header is present
-    if lines[0].replace(" ", "") != "Port        Low-power Mode".replace(" ", ""):
-        logging.error("Invalid output format: Header missing")
+def validate_transceiver_lpmode(sfp_lpmode, port):
+    lpmode = sfp_lpmode.get(port)
+    if lpmode is None:
+        logging.error(f"Interface {port} does not present in the show command")
         return False
-    for line in lines[2:]:
-        port, lpmode = line.strip().split()
-        if lpmode not in ["Off", "On"]:
-            logging.error("Invalid low-power mode {} for port {}".format(lpmode, port))
-            return False
+
+    if lpmode not in ["Off", "On"]:
+        logging.error("Invalid low-power mode {} for port {}".format(lpmode, port))
+        return False
+
     return True