Add device action support to the alarm_control_panel integration (#27616)

* Add device action support to the alarm_control_panel integration

* Improve tests

tests/testing_config/custom_components/test/alarm_control_panel.py

@@ -0,0 +1,91 @@
+"""
+Provide a mock alarm_control_panel platform.
+
+Call init before using it in your tests to ensure clean test data.
+"""
+from homeassistant.components.alarm_control_panel import AlarmControlPanel
+from homeassistant.const import (
+    STATE_ALARM_ARMED_AWAY,
+    STATE_ALARM_ARMED_HOME,
+    STATE_ALARM_ARMED_NIGHT,
+    STATE_ALARM_DISARMED,
+    STATE_ALARM_TRIGGERED,
+)
+from tests.common import MockEntity
+
+ENTITIES = {}
+
+
+def init(empty=False):
+    """Initialize the platform with entities."""
+    global ENTITIES
+
+    ENTITIES = (
+        {}
+        if empty
+        else {
+            "arm_code": MockAlarm(
+                name=f"Alarm arm code",
+                code_arm_required=True,
+                unique_id="unique_arm_code",
+            ),
+            "no_arm_code": MockAlarm(
+                name=f"Alarm no arm code",
+                code_arm_required=False,
+                unique_id="unique_no_arm_code",
+            ),
+        }
+    )
+
+
+async def async_setup_platform(
+    hass, config, async_add_entities_callback, discovery_info=None
+):
+    """Return mock entities."""
+    async_add_entities_callback(list(ENTITIES.values()))
+
+
+class MockAlarm(MockEntity, AlarmControlPanel):
+    """Mock Alarm control panel class."""
+
+    def __init__(self, **values):
+        """Init the Mock Alarm Control Panel."""
+        self._state = None
+
+        MockEntity.__init__(self, **values)
+
+    @property
+    def code_arm_required(self):
+        """Whether the code is required for arm actions."""
+        return self._handle("code_arm_required")
+
+    @property
+    def state(self):
+        """Return the state of the device."""
+        return self._state
+
+    def alarm_arm_away(self, code=None):
+        """Send arm away command."""
+        self._state = STATE_ALARM_ARMED_AWAY
+        self.async_write_ha_state()
+
+    def alarm_arm_home(self, code=None):
+        """Send arm home command."""
+        self._state = STATE_ALARM_ARMED_HOME
+        self.async_write_ha_state()
+
+    def alarm_arm_night(self, code=None):
+        """Send arm night command."""
+        self._state = STATE_ALARM_ARMED_NIGHT
+        self.async_write_ha_state()
+
+    def alarm_disarm(self, code=None):
+        """Send disarm command."""
+        if code == "1234":
+            self._state = STATE_ALARM_DISARMED
+            self.async_write_ha_state()
+
+    def alarm_trigger(self, code=None):
+        """Send alarm trigger command."""
+        self._state = STATE_ALARM_TRIGGERED
+        self.async_write_ha_state()