Fix type cast in snmp (home-assistant#114795)

homeassistant/components/snmp/sensor.py

@@ -270,7 +270,7 @@ def _decode_value(self, value):
             "SNMP OID %s received type=%s and data %s",
             self._baseoid,
             type(value),
-            bytes(value),
+            value,
         )
         if isinstance(value, NoSuchObject):
             _LOGGER.error(

tests/components/snmp/test_negative_sensor.py

@@ -0,0 +1,79 @@
+"""SNMP sensor tests."""
+
+from unittest.mock import patch
+
+from pysnmp.hlapi import Integer32
+import pytest
+
+from homeassistant.components.sensor import DOMAIN as SENSOR_DOMAIN
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import entity_registry as er
+from homeassistant.setup import async_setup_component
+
+
+@pytest.fixture(autouse=True)
+def hlapi_mock():
+    """Mock out 3rd party API."""
+    mock_data = Integer32(-13)
+    with patch(
+        "homeassistant.components.snmp.sensor.getCmd",
+        return_value=(None, None, None, [[mock_data]]),
+    ):
+        yield
+
+
+async def test_basic_config(hass: HomeAssistant) -> None:
+    """Test basic entity configuration."""
+
+    config = {
+        SENSOR_DOMAIN: {
+            "platform": "snmp",
+            "host": "192.168.1.32",
+            "baseoid": "1.3.6.1.4.1.2021.10.1.3.1",
+        },
+    }
+
+    assert await async_setup_component(hass, SENSOR_DOMAIN, config)
+    await hass.async_block_till_done()
+
+    state = hass.states.get("sensor.snmp")
+    assert state.state == "-13"
+    assert state.attributes == {"friendly_name": "SNMP"}
+
+
+async def test_entity_config(hass: HomeAssistant) -> None:
+    """Test entity configuration."""
+
+    config = {
+        SENSOR_DOMAIN: {
+            # SNMP configuration
+            "platform": "snmp",
+            "host": "192.168.1.32",
+            "baseoid": "1.3.6.1.4.1.2021.10.1.3.1",
+            # Entity configuration
+            "icon": "{{'mdi:one_two_three'}}",
+            "picture": "{{'blabla.png'}}",
+            "device_class": "temperature",
+            "name": "{{'SNMP' + ' ' + 'Sensor'}}",
+            "state_class": "measurement",
+            "unique_id": "very_unique",
+            "unit_of_measurement": "°C",
+        },
+    }
+
+    assert await async_setup_component(hass, SENSOR_DOMAIN, config)
+    await hass.async_block_till_done()
+
+    entity_registry = er.async_get(hass)
+    assert entity_registry.async_get("sensor.snmp_sensor").unique_id == "very_unique"
+
+    state = hass.states.get("sensor.snmp_sensor")
+    assert state.state == "-13"
+    assert state.attributes == {
+        "device_class": "temperature",
+        "entity_picture": "blabla.png",
+        "friendly_name": "SNMP Sensor",
+        "icon": "mdi:one_two_three",
+        "state_class": "measurement",
+        "unit_of_measurement": "°C",
+    }