Make sure context_id is 26 chars and partially conform to ULID standard (#550)

tests/test_switch.py

@@ -4,9 +4,7 @@ import asyncio
 from copy import deepcopy
 import datetime
 import logging
-from random import choices as random_choices
 from random import randint
-import string
 from unittest.mock import patch
 
 from homeassistant.components.adaptive_lighting.const import (
@@ -76,6 +74,7 @@ from homeassistant.setup import async_setup_component
 from homeassistant.util.color import color_temperature_mired_to_kelvin
 import homeassistant.util.dt as dt_util
 import pytest
+import ulid_transform
 import voluptuous.error
 
 from tests.common import MockConfigEntry, mock_area_registry
@@ -118,6 +117,10 @@ GLOBAL_TEST_DEPENDENCIES = [
 ]
 
 
+def create_random_context() -> str:
+    return Context(id=ulid_transform.ulid_now(), parent_id=None)
+
+
 @pytest.fixture
 def reset_time_zone():
     """Reset time zone."""
@@ -219,16 +222,6 @@ async def setup_lights_and_switch(hass, extra_conf=None):
     return switch, lights_instances
 
 
-def create_random_context() -> str:
-    ulid_max_length = 26  # changed from 36->26 in core2023.4.0
-    return Context(
-        id="".join(
-            random_choices(string.ascii_uppercase + string.digits, k=ulid_max_length)
-        ),
-        parent_id=None,
-    )
-
-
 # see https://github.com/home-assistant/core/blob/dev/homeassistant/scripts/benchmark/__init__.py
 # basically just search the repo for EVENT_STATE_CHANGED look for how it's fired.
 def create_transition_events(