Add test for fabric daemon

tests/test_fabric_port.py

@@ -0,0 +1,50 @@
+from swsscommon import swsscommon
+from dvslib.dvs_database import DVSDatabase
+
+
+class TestVirtualChassis(object):
+    def test_voq_switch_fabric_link(self, vst):
+        """Test fabric link manual isolation commands in VOQ switch.
+
+        By issuing config fabric port isolation command, the value
+        of isolateStatus field in config_db get changed. This test validates appl_db
+        updates of a fabric link isolateStatus as the value in config_db changed.
+        """
+
+        dvss = vst.dvss
+        for name in dvss.keys():
+            dvs = dvss[name]
+            # Get the config info
+            config_db = dvs.get_config_db()
+            metatbl = config_db.get_entry("DEVICE_METADATA", "localhost")
+
+            cfg_switch_type = metatbl.get("switch_type")
+            if cfg_switch_type == "fabric":
+
+               # get config_db information
+               cdb = dvs.get_config_db()
+               # check if the link isolateStatus in config_db is False as a start value.
+               cdb.wait_for_field_match("FABRIC_PORT", "Fabric1", {"isolateStatus": "False"})
+
+               # set config_db to isolateStatus: True
+               cdb.update_entry("FABRIC_PORT", "Fabric1", {"isolateStatus": "True"})
+               cdb.wait_for_field_match("FABRIC_PORT", "Fabric1", {"isolateStatus": "True"})
+
+               # check if appl_db value changes to isolateStatus: True
+               adb = dvs.get_app_db()
+               adb.wait_for_field_match("FABRIC_PORT_TABLE", "Fabric1", {"isolateStatus": "True"})
+
+               # cleanup
+               cdb.update_entry("FABRIC_PORT", "Fabric1", {"isolateStatus": "False"})
+               cdb.wait_for_field_match("FABRIC_PORT", "Fabric1", {"isolateStatus": "False"})
+               adb.wait_for_field_match("FABRIC_PORT_TABLE", "Fabric1", {"isolateStatus": "False"})
+            else:
+               print( "We do not check switch type:", cfg_switch_type )
+
+
+# Add Dummy always-pass test at end as workaroud
+# for issue when Flaky fail on final test it invokes module tear-down before retrying
+def test_nonflaky_dummy():
+    pass
+
+