Fix testing case expectation after changing the way of reading the sysfs value

Signed-off-by: Yuanzhe, Liu <[email protected]>

Author: yuazhe

platform/mellanox/mlnx-platform-api/sonic_platform/liquid_cooling.py

@@ -44,7 +44,7 @@ def __init__(self, name,path):
         self.path = path
 
     def is_leak(self):
-        content = utils.read_int_from_file(self.path)
+        content = utils.read_int_from_file(self.path, 0)
 
         if content == 1:
             self.leaking = False

platform/mellanox/mlnx-platform-api/tests/test_liquid_cooling.py

@@ -26,10 +26,9 @@ def test_leakage_sensor_is_leak():
     # Test when file does not exist
     with mock.patch('os.path.exists') as mock_exists:
         mock_exists.return_value = False
-        assert sensor.is_leak() is None
+        assert sensor.is_leak() is True
 
 def test_liquid_cooling_init():
-
     with mock.patch('os.path.exists') as mock_exists, \
          mock.patch('os.path.join', side_effect=lambda *args: "/".join(args)) as mock_join, \
          mock.patch('glob.glob') as mock_glob:
@@ -48,5 +47,7 @@ def test_liquid_cooling_init():
         # Verify the number of sensors initialized
         assert liquid_cooling.leakage_sensors_num == 4
 
-        sensors = liquid_cooling.get_leak_sensor_status()
-        assert len(sensors) == 0
+
+        with mock.patch.object(liquid_cooling.leakage_sensors[3], 'is_leak', return_value=False) as mock_sensor1:
+            sensors = liquid_cooling.get_leak_sensor_status()
+            assert len(sensors) == 3