Use UnitOfRatio.PARTS_PER_MILLION over deprecated CONCENTRATION_PARTS_PER_MILLION

.github/workflows/quality.yaml

@@ -22,7 +22,10 @@ jobs:
       - uses: actions/setup-python@v5
         name: Setup Python
         with:
-          python-version: 3.13
+          # Home Assistant 2026.7+ requires Python >= 3.14.2, and requirements.txt
+          # installs `homeassistant` unpinned. On 3.13 pip resolves the newest HA
+          # that still supports 3.13 (2026.2.x), which predates UnitOfRatio.
+          python-version: "3.14"
       - name: Update pip
         run: python -m pip install --upgrade pip
       - name: Install dependencies

custom_components/ac_infinity/sensor.py

@@ -12,11 +12,11 @@
 )
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
-    CONCENTRATION_PARTS_PER_MILLION,
     PERCENTAGE,
     Platform,
     UnitOfConductivity,
     UnitOfPressure,
+    UnitOfRatio,
     UnitOfTemperature,
     UnitOfTime,
 )
@@ -375,7 +375,7 @@ def __get_next_mode_change_timestamp(
         key=SensorReferenceKey.CO2_SENSOR,
         device_class=SensorDeviceClass.CO2,
         state_class=SensorStateClass.MEASUREMENT,
-        native_unit_of_measurement=CONCENTRATION_PARTS_PER_MILLION,
+        native_unit_of_measurement=UnitOfRatio.PARTS_PER_MILLION,
         suggested_unit_of_measurement=None,
         icon=None,  # default
         translation_key="co2_sensor",
@@ -447,7 +447,7 @@ def __get_next_mode_change_timestamp(
         key=SensorReferenceKey.HYDRO_TDS,
         device_class=None,
         state_class=SensorStateClass.MEASUREMENT,
-        native_unit_of_measurement=CONCENTRATION_PARTS_PER_MILLION,
+        native_unit_of_measurement=UnitOfRatio.PARTS_PER_MILLION,
         suggested_unit_of_measurement=None,
         icon=MdiIcon.WATER_OPACITY,
         translation_key="hydro_tds_sensor",

hacs.json

@@ -1,5 +1,6 @@
 {
     "name": "AC Infinity",
+    "homeassistant": "2026.7.0",
     "render_readme": true,
     "zip_release": true,
     "filename": "ac_infinity.zip"

tests/conftest.py

@@ -0,0 +1,57 @@
+"""Shared test fixtures and compatibility shims.
+
+Installs a small aioresponses/aiohttp compatibility shim; see
+``_patch_client_response_for_aioresponses`` below.
+"""
+
+from __future__ import annotations
+
+import inspect
+from typing import Any
+
+from aiohttp.client_reqrep import ClientResponse
+
+
+class _NullStreamWriter:
+    """Stand-in for the stream writer aiohttp>=3.13 reads on construction.
+
+    A mocked response is never actually written to the wire, so aiohttp only
+    reads ``output_size`` off this object (client_reqrep records it when the
+    request was "already sent").
+    """
+
+    output_size = 0
+
+
+def _patch_client_response_for_aioresponses() -> None:
+    """Let aioresponses build responses on aiohttp>=3.13.
+
+    aiohttp 3.13 added a required keyword-only ``stream_writer`` argument to
+    ``ClientResponse.__init__``. aioresponses (through 0.7.9, current) does
+    not pass it, so every mocked request in tests/test_client.py dies with::
+
+        TypeError: ClientResponse.__init__() missing 1 required
+        keyword-only argument: 'stream_writer'
+
+    Default that kwarg rather than capping the test-time aiohttp: this
+    integration's runtime dependency is uncapped, so pinning the tests to an
+    old aiohttp would mean never exercising the version users actually run.
+
+    The shim is self-limiting in both directions -- on aiohttp<3.13 the
+    parameter does not exist and we skip patching entirely, and once
+    aioresponses passes ``stream_writer`` itself the ``setdefault`` becomes a
+    no-op. Remove it once aioresponses supports aiohttp>=3.13 natively.
+    """
+    if "stream_writer" not in inspect.signature(ClientResponse.__init__).parameters:
+        return
+
+    original_init = ClientResponse.__init__
+
+    def _init(self: ClientResponse, *args: Any, **kwargs: Any) -> None:
+        kwargs.setdefault("stream_writer", _NullStreamWriter())
+        original_init(self, *args, **kwargs)
+
+    ClientResponse.__init__ = _init  # type: ignore[method-assign]
+
+
+_patch_client_response_for_aioresponses()