[fanshow] Display other fan status, such as Updating (sonic-net#1014)

The original fan status can be one of "OK", "Not OK", "N/A". This PR allows a new fan status "Updating".
If fan status is not "true" or "false", display the status field value in CLI output.

scripts/fanshow

@@ -4,10 +4,23 @@
 """
 from __future__ import print_function
 
+import os
+import sys
 from tabulate import tabulate
 from swsssdk import SonicV2Connector
 from natsort import natsorted
 
+# mock the redis for unit test purposes #
+try:
+    if os.environ["UTILITIES_UNIT_TESTING"] == "1":
+        modules_path = os.path.join(os.path.dirname(__file__), "..")
+        test_path = os.path.join(modules_path, "tests")
+        sys.path.insert(0, modules_path)
+        sys.path.insert(0, test_path)
+        import mock_tables.dbconnector
+except KeyError:
+    pass
+
 
 header = ['Drawer', 'LED', 'FAN', 'Speed', 'Direction', 'Presence', 'Status', 'Timestamp']
 
@@ -52,13 +65,13 @@ class FanShow(object):
 
             presence = data_dict[PRESENCE_FIELD_NAME].lower()
             presence = 'Present' if presence == 'true' else 'Not Present'
-            status = data_dict[STATUS_FIELD_NAME].lower()
-            if status == 'true':
+
+            status = data_dict[STATUS_FIELD_NAME]
+            status_lower = status.lower()
+            if status_lower == 'true':
                 status = 'OK'
-            elif status == 'false':
+            elif status_lower == 'false':
                 status = 'Not OK'
-            else:
-                status = 'N/A'
 
             table.append((data_dict[DRAWER_FIELD_NAME], data_dict[LED_STATUS_FIELD_NAME], name, speed, data_dict[DIRECTION_FIELD_NAME], presence, status, 
                           data_dict[TIMESTAMP_FIELD_NAME]))

tests/fan_test.py

@@ -0,0 +1,38 @@
+import sys
+import os
+from click.testing import CliRunner
+
+test_path = os.path.dirname(os.path.abspath(__file__))
+modules_path = os.path.dirname(test_path)
+scripts_path = os.path.join(modules_path, "scripts")
+sys.path.insert(0, modules_path)
+
+import show.main as show
+
+class TestFan(object):
+    @classmethod
+    def setup_class(cls):
+        print("SETUP")
+        os.environ["PATH"] += os.pathsep + scripts_path
+        os.environ["UTILITIES_UNIT_TESTING"] = "1"
+
+    def test_show_platform_fan(self):
+        runner = CliRunner()
+        result = runner.invoke(show.cli.commands["platform"].commands["fan"])
+        print(result.output)
+        expected = """\
+  Drawer    LED    FAN    Speed    Direction    Presence    Status          Timestamp
+--------  -----  -----  -------  -----------  ----------  --------  -----------------
+ drawer1    red   fan1      30%       intake     Present        OK  20200813 01:32:30
+ drawer2  green   fan2      50%       intake     Present    Not OK  20200813 01:32:30
+ drawer3  green   fan3      50%       intake     Present  Updating  20200813 01:32:30
+"""
+
+        assert result.output == expected
+
+    @classmethod
+    def teardown_class(cls):
+        print("TEARDOWN")
+        os.environ["PATH"] = os.pathsep.join(os.environ["PATH"].split(os.pathsep)[:-1])
+        os.environ["UTILITIES_UNIT_TESTING"] = "0"
+

tests/mock_tables/state_db.json

@@ -164,5 +164,44 @@
         "runner.fast_rate": "false",
         "setup.kernel_team_mode_name": "loadbalance",
         "runner.active": "true"
+    },
+    "FAN_INFO|fan1": {
+        "drawer_name": "drawer1",
+        "presence": "True",
+        "model": "N/A",
+        "serial": "N/A",
+        "status": "True",
+        "direction": "intake",
+        "speed": "30",
+        "speed_tolerance": "50",
+        "speed_target": "20",
+        "led_status": "red",
+        "timestamp": "20200813 01:32:30"
+    },
+    "FAN_INFO|fan2": {
+        "drawer_name": "drawer2",
+        "presence": "True",
+        "model": "N/A",
+        "serial": "N/A",
+        "status": "False",
+        "direction": "intake",
+        "speed": "50",
+        "speed_tolerance": "50",
+        "speed_target": "50",
+        "led_status": "green",
+        "timestamp": "20200813 01:32:30"
+    },
+    "FAN_INFO|fan3": {
+        "drawer_name": "drawer3",
+        "presence": "True",
+        "model": "N/A",
+        "serial": "N/A",
+        "status": "Updating",
+        "direction": "intake",
+        "speed": "50",
+        "speed_tolerance": "50",
+        "speed_target": "50",
+        "led_status": "green",
+        "timestamp": "20200813 01:32:30"
     }
 }