Use Etag in GitHub coordinator updates (#64449)

Co-authored-by: Franck Nijhof <git@frenck.dev>

tests/components/github/test_sensor.py

@@ -0,0 +1,42 @@
+"""Test GitHub sensor."""
+from unittest.mock import patch
+
+from aiogithubapi import GitHubNotModifiedException
+import pytest
+
+from homeassistant.components.github.const import DEFAULT_UPDATE_INTERVAL
+from homeassistant.core import HomeAssistant
+from homeassistant.util import dt
+
+from tests.common import MockConfigEntry, async_fire_time_changed
+
+TEST_SENSOR_ENTITY = "sensor.octocat_hello_world_latest_release"
+
+
+async def test_sensor_updates_with_not_modified_content(
+    hass: HomeAssistant,
+    init_integration: MockConfigEntry,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Test the sensor updates by default GitHub sensors."""
+    state = hass.states.get(TEST_SENSOR_ENTITY)
+    assert state.state == "v1.0.0"
+    assert (
+        "Content for octocat/Hello-World with RepositoryReleaseDataUpdateCoordinator not modified"
+        not in caplog.text
+    )
+
+    with patch(
+        "aiogithubapi.namespaces.releases.GitHubReleasesNamespace.list",
+        side_effect=GitHubNotModifiedException,
+    ):
+
+        async_fire_time_changed(hass, dt.utcnow() + DEFAULT_UPDATE_INTERVAL)
+        await hass.async_block_till_done()
+
+        assert (
+            "Content for octocat/Hello-World with RepositoryReleaseDataUpdateCoordinator not modified"
+            in caplog.text
+        )
+    new_state = hass.states.get(TEST_SENSOR_ENTITY)
+    assert state.state == new_state.state