Use Decimal quantize to round half up

- Switch the rounding method.

- Add unit tests for the rounding.

pymelcloud/device.py

@@ -2,6 +2,7 @@
 import asyncio
 from abc import ABC, abstractmethod
 from datetime import datetime, timedelta, timezone
+from decimal import Decimal, ROUND_HALF_UP
 from typing import Any, Dict, List, Optional
 
 from pymelcloud.client import Client
@@ -62,12 +63,10 @@ def get_state_prop(self, name: str) -> Optional[Any]:
 
     def round_temperature(self, temperature: float) -> float:
         """Round a temperature to the nearest temperature increment."""
-        increment = self.temperature_increment
-        if temperature < 0:
-            half_increment = -increment / 2.0
-        else:
-            half_increment = increment / 2.0
-        return round((temperature + half_increment) / increment) * increment
+        return float(
+            Decimal(str(temperature / self.temperature_increment))
+            .quantize(Decimal('1'), rounding=ROUND_HALF_UP)
+        ) * self.temperature_increment
 
     @abstractmethod
     def apply_write(self, state: Dict[str, Any], key: str, value: Any):

tests/test_atw_properties.py

@@ -1,9 +1,5 @@
 """Ecodan tests."""
-import json
-import os
-
 import pytest
-from asynctest import CoroutineMock, Mock, patch
 from pymelcloud import DEVICE_TYPE_ATW
 from pymelcloud.atw_device import (
     OPERATION_MODE_AUTO,
@@ -21,23 +17,11 @@
     ZONE_STATUS_UNKNOWN,
     AtwDevice,
 )
+from .util import build_device
 
 
 def _build_device(device_conf_name: str, device_state_name: str) -> AtwDevice:
-    test_dir = os.path.join(os.path.dirname(__file__), "samples")
-    with open(os.path.join(test_dir, device_conf_name), "r") as json_file:
-        device_conf = json.load(json_file)
-
-    with open(os.path.join(test_dir, device_state_name), "r") as json_file:
-        device_state = json.load(json_file)
-
-    with patch("pymelcloud.client.Client") as _client:
-        _client.update_confs = CoroutineMock()
-        _client.device_confs.__iter__ = Mock(return_value=[device_conf].__iter__())
-        _client.fetch_device_units = CoroutineMock(return_value=[])
-        _client.fetch_device_state = CoroutineMock(return_value=device_state)
-        client = _client
-
+    device_conf, client = build_device(device_conf_name, device_state_name)
     return AtwDevice(device_conf, client)
 
 

tests/test_device.py

@@ -0,0 +1,41 @@
+"""Device tests."""
+
+import pytest
+from pymelcloud.ata_device import AtaDevice
+from .util import build_device
+
+
+def _build_device(device_conf_name: str, device_state_name: str) -> AtaDevice:
+    device_conf, client = build_device(device_conf_name, device_state_name)
+    return AtaDevice(device_conf, client)
+
+
+@pytest.mark.asyncio
+async def test_round_temperature():
+    device = _build_device("ata_listdevice.json", "ata_get.json")
+    device._device_conf.get("Device")["TemperatureIncrement"] = 0.5
+
+    assert device.round_temperature(23.99999) == 24.0
+    assert device.round_temperature(24.0) == 24.0
+    assert device.round_temperature(24.00001) == 24.0
+    assert device.round_temperature(24.24999) == 24.0
+    assert device.round_temperature(24.25) == 24.5
+    assert device.round_temperature(24.25001) == 24.5
+    assert device.round_temperature(24.5) == 24.5
+    assert device.round_temperature(24.74999) == 24.5
+    assert device.round_temperature(24.75) == 25.0
+    assert device.round_temperature(24.75001) == 25.0
+
+    device._device_conf.get("Device")["TemperatureIncrement"] = 1
+
+    assert device.round_temperature(23.99999) == 24.0
+    assert device.round_temperature(24.0) == 24.0
+    assert device.round_temperature(24.00001) == 24.0
+    assert device.round_temperature(24.49999) == 24.0
+    assert device.round_temperature(24.5) == 25.0
+    assert device.round_temperature(24.50001) == 25.0
+    assert device.round_temperature(25.0) == 25.0
+    assert device.round_temperature(25.00001) == 25.0
+    assert device.round_temperature(25.49999) == 25.0
+    assert device.round_temperature(25.5) == 26.0
+

tests/util.py

@@ -0,0 +1,21 @@
+import json
+import os
+
+from asynctest import CoroutineMock, Mock, patch
+
+def build_device(device_conf_name: str, device_state_name: str):
+    test_dir = os.path.join(os.path.dirname(__file__), "samples")
+    with open(os.path.join(test_dir, device_conf_name), "r") as json_file:
+        device_conf = json.load(json_file)
+
+    with open(os.path.join(test_dir, device_state_name), "r") as json_file:
+        device_state = json.load(json_file)
+
+    with patch("pymelcloud.client.Client") as _client:
+        _client.update_confs = CoroutineMock()
+        _client.device_confs.__iter__ = Mock(return_value=[device_conf].__iter__())
+        _client.fetch_device_units = CoroutineMock(return_value=[])
+        _client.fetch_device_state = CoroutineMock(return_value=device_state)
+        client = _client
+
+    return device_conf, client