Add event statistics to Sonos diagnostics (#64845)

tests/components/sonos/test_statistics.py

@@ -0,0 +1,30 @@
+"""Tests for the Sonos statistics."""
+from homeassistant.components.sonos.const import DATA_SONOS
+
+
+async def test_statistics_duplicate(
+    hass, async_autosetup_sonos, soco, device_properties_event
+):
+    """Test Sonos statistics."""
+    speaker = list(hass.data[DATA_SONOS].discovered.values())[0]
+
+    subscription = soco.deviceProperties.subscribe.return_value
+    sub_callback = subscription.callback
+
+    # Update the speaker with a callback event
+    sub_callback(device_properties_event)
+    await hass.async_block_till_done()
+
+    report = speaker.event_stats.report()
+    assert report["DeviceProperties"]["received"] == 1
+    assert report["DeviceProperties"]["duplicates"] == 0
+    assert report["DeviceProperties"]["processed"] == 1
+
+    # Ensure a duplicate is registered in the statistics
+    sub_callback(device_properties_event)
+    await hass.async_block_till_done()
+
+    report = speaker.event_stats.report()
+    assert report["DeviceProperties"]["received"] == 2
+    assert report["DeviceProperties"]["duplicates"] == 1
+    assert report["DeviceProperties"]["processed"] == 1