Added optional precision configuration option to generic_thermostat. (h…

…ome-assistant#18317)

* Added optional precision configuration option to generic_thermostat.

* Added optional precision configuration option to generic_thermostat.

* Style update.

homeassistant/components/climate/generic_thermostat.py

@@ -17,7 +17,8 @@
     SUPPORT_AWAY_MODE, SUPPORT_TARGET_TEMPERATURE, PLATFORM_SCHEMA)
 from homeassistant.const import (
     STATE_ON, STATE_OFF, ATTR_TEMPERATURE, CONF_NAME, ATTR_ENTITY_ID,
-    SERVICE_TURN_ON, SERVICE_TURN_OFF, STATE_UNKNOWN)
+    SERVICE_TURN_ON, SERVICE_TURN_OFF, STATE_UNKNOWN, PRECISION_HALVES,
+    PRECISION_TENTHS, PRECISION_WHOLE)
 from homeassistant.helpers import condition
 from homeassistant.helpers.event import (
     async_track_state_change, async_track_time_interval)
@@ -43,6 +44,7 @@
 CONF_KEEP_ALIVE = 'keep_alive'
 CONF_INITIAL_OPERATION_MODE = 'initial_operation_mode'
 CONF_AWAY_TEMP = 'away_temp'
+CONF_PRECISION = 'precision'
 SUPPORT_FLAGS = (SUPPORT_TARGET_TEMPERATURE |
                  SUPPORT_OPERATION_MODE)
 
@@ -63,7 +65,9 @@
         cv.time_period, cv.positive_timedelta),
     vol.Optional(CONF_INITIAL_OPERATION_MODE):
         vol.In([STATE_AUTO, STATE_OFF]),
-    vol.Optional(CONF_AWAY_TEMP): vol.Coerce(float)
+    vol.Optional(CONF_AWAY_TEMP): vol.Coerce(float),
+    vol.Optional(CONF_PRECISION): vol.In(
+        [PRECISION_TENTHS, PRECISION_HALVES, PRECISION_WHOLE]),
 })
 
 
@@ -83,11 +87,13 @@ async def async_setup_platform(hass, config, async_add_entities,
     keep_alive = config.get(CONF_KEEP_ALIVE)
     initial_operation_mode = config.get(CONF_INITIAL_OPERATION_MODE)
     away_temp = config.get(CONF_AWAY_TEMP)
+    precision = config.get(CONF_PRECISION)
 
     async_add_entities([GenericThermostat(
         hass, name, heater_entity_id, sensor_entity_id, min_temp, max_temp,
         target_temp, ac_mode, min_cycle_duration, cold_tolerance,
-        hot_tolerance, keep_alive, initial_operation_mode, away_temp)])
+        hot_tolerance, keep_alive, initial_operation_mode, away_temp,
+        precision)])
 
 
 class GenericThermostat(ClimateDevice):
@@ -96,7 +102,7 @@ class GenericThermostat(ClimateDevice):
     def __init__(self, hass, name, heater_entity_id, sensor_entity_id,
                  min_temp, max_temp, target_temp, ac_mode, min_cycle_duration,
                  cold_tolerance, hot_tolerance, keep_alive,
-                 initial_operation_mode, away_temp):
+                 initial_operation_mode, away_temp, precision):
         """Initialize the thermostat."""
         self.hass = hass
         self._name = name
@@ -109,6 +115,7 @@ def __init__(self, hass, name, heater_entity_id, sensor_entity_id,
         self._initial_operation_mode = initial_operation_mode
         self._saved_target_temp = target_temp if target_temp is not None \
             else away_temp
+        self._temp_precision = precision
         if self.ac_mode:
             self._current_operation = STATE_COOL
             self._operation_list = [STATE_COOL, STATE_OFF]
@@ -202,6 +209,13 @@ def name(self):
         """Return the name of the thermostat."""
         return self._name
 
+    @property
+    def precision(self):
+        """Return the precision of the system."""
+        if self._temp_precision is not None:
+            return self._temp_precision
+        return super().precision
+
     @property
     def temperature_unit(self):
         """Return the unit of measurement."""

tests/components/climate/test_generic_thermostat.py

@@ -15,6 +15,7 @@
     STATE_OFF,
     STATE_IDLE,
     TEMP_CELSIUS,
+    TEMP_FAHRENHEIT,
     ATTR_TEMPERATURE
 )
 from homeassistant import loader
@@ -1074,6 +1075,37 @@ async def test_turn_off_when_off(hass, setup_comp_9):
         state_cool.attributes.get('operation_mode')
 
 
+@pytest.fixture
+def setup_comp_10(hass):
+    """Initialize components."""
+    hass.config.temperature_unit = TEMP_FAHRENHEIT
+    assert hass.loop.run_until_complete(async_setup_component(
+        hass, climate.DOMAIN, {'climate': {
+            'platform': 'generic_thermostat',
+            'name': 'test',
+            'cold_tolerance': 0.3,
+            'hot_tolerance': 0.3,
+            'target_temp': 25,
+            'heater': ENT_SWITCH,
+            'target_sensor': ENT_SENSOR,
+            'min_cycle_duration': datetime.timedelta(minutes=15),
+            'keep_alive': datetime.timedelta(minutes=10),
+            'precision': 0.1
+        }}))
+
+
+async def test_precision(hass, setup_comp_10):
+    """Test that setting precision to tenths works as intended."""
+    common.async_set_operation_mode(hass, STATE_OFF)
+    await hass.async_block_till_done()
+    await hass.services.async_call('climate', SERVICE_TURN_OFF)
+    await hass.async_block_till_done()
+    common.async_set_temperature(hass, 23.27)
+    await hass.async_block_till_done()
+    state = hass.states.get(ENTITY)
+    assert 23.3 == state.attributes.get('temperature')
+
+
 async def test_custom_setup_params(hass):
     """Test the setup with custom parameters."""
     result = await async_setup_component(