Add the port FEC BER mgmt test

tests/platform_tests/test_intf_fec.py

@@ -11,7 +11,8 @@
 SUPPORTED_PLATFORMS = [
     "mlnx_msn",
     "8101_32fh",
-    "8111_32eh"
+    "8111_32eh",
+    "arista"
 ]
 
 SUPPORTED_SPEEDS = [
@@ -35,6 +36,9 @@ def test_verify_fec_oper_mode(duthosts, enum_rand_one_per_hwsku_frontend_hostnam
     """
     duthost = duthosts[enum_rand_one_per_hwsku_frontend_hostname]
 
+    if "broadcom" in duthost.facts.get('platform_asic'):
+        pytest.skip("Skipping this test on platforms with Broadcom ASICs")
+
     logging.info("Get output of '{}'".format("show interface status"))
     intf_status = duthost.show_and_parse("show interface status")
 
@@ -63,6 +67,9 @@ def test_config_fec_oper_mode(duthosts, enum_rand_one_per_hwsku_frontend_hostnam
     """
     duthost = duthosts[enum_rand_one_per_hwsku_frontend_hostname]
 
+    if "broadcom" in duthost.facts.get('platform_asic'):
+        pytest.skip("Skipping this test on platforms with Broadcom ASICs")
+
     logging.info("Get output of '{}'".format("show interface status"))
     intf_status = duthost.show_and_parse("show interface status")
 
@@ -119,6 +126,17 @@ def test_verify_fec_stats_counters(duthosts, enum_rand_one_per_hwsku_frontend_ho
     logging.info("Get output of 'show interfaces counters fec-stats'")
     intf_status = duthost.show_and_parse("show interfaces counters fec-stats")
 
+    def skip_ber_counters_test(intf_status: dict) -> bool:
+        """
+        Check whether the BER fields (Pre-FEC and Post-FEC BER)
+        exists in the "show interfaces counters fec-stats"
+        CLI output
+        """
+        if intf_status.get('fec_pre_ber') is None or intf_status.get('fec_post_ber') is None:
+            pytest.fail("Pre-FEC and Port-FEC BER fields missing on interface. intf_status: {}".format(intf_status))
+            return True
+        return False
+
     for intf in intf_status:
         intf_name = intf['iface']
         speed = get_interface_speed(duthost, intf_name)
@@ -147,3 +165,17 @@ def test_verify_fec_stats_counters(duthosts, enum_rand_one_per_hwsku_frontend_ho
         if fec_symbol_err_int > fec_corr_int:
             pytest.fail("FEC symbol errors:{} are higher than FEC correctable errors:{} for interface {}"
                         .format(intf_name, fec_symbol_err_int, fec_corr_int))
+
+        if skip_ber_counters_test(intf):
+            continue
+        fec_pre_ber = intf.get('fec_pre_ber', '').lower()
+        fec_post_ber = intf.get('fec_post_ber', '').lower()
+        try:
+            if fec_pre_ber != "n/a":
+                float(fec_pre_ber)
+            if fec_post_ber != "n/a":
+                float(fec_post_ber)
+        except ValueError:
+            pytest.fail("Pre-FEC and Post-FEC BER are not valid floats for interface {}, \
+                    fec_pre_ber: {} fec_post_ber: {}"
+                        .format(intf_name, fec_pre_ber, fec_post_ber))