Fix creating cert_expiry configs during runtime (#56298)

* Fix creating cert_expiry configs during runtime

* Address review feedback on tests

* Improve delayed startup test

tests/components/cert_expiry/test_init.py

@@ -12,6 +12,7 @@ from homeassistant.const import (
     EVENT_HOMEASSISTANT_STARTED,
     STATE_UNAVAILABLE,
 )
+from homeassistant.core import CoreState
 from homeassistant.setup import async_setup_component
 import homeassistant.util.dt as dt_util
 
@@ -23,6 +24,8 @@ from tests.common import MockConfigEntry, async_fire_time_changed
 
 async def test_setup_with_config(hass):
     """Test setup component with config."""
+    assert hass.state is CoreState.running
+
     config = {
         SENSOR_DOMAIN: [
             {"platform": DOMAIN, CONF_HOST: HOST, CONF_PORT: PORT},
@@ -49,6 +52,8 @@ async def test_setup_with_config(hass):
 
 async def test_update_unique_id(hass):
     """Test updating a config entry without a unique_id."""
+    assert hass.state is CoreState.running
+
     entry = MockConfigEntry(domain=DOMAIN, data={CONF_HOST: HOST, CONF_PORT: PORT})
     entry.add_to_hass(hass)
 
@@ -71,6 +76,8 @@ async def test_update_unique_id(hass):
 @patch("homeassistant.util.dt.utcnow", return_value=static_datetime())
 async def test_unload_config_entry(mock_now, hass):
     """Test unloading a config entry."""
+    assert hass.state is CoreState.running
+
     entry = MockConfigEntry(
         domain=DOMAIN,
         data={CONF_HOST: HOST, CONF_PORT: PORT},
@@ -107,3 +114,35 @@ async def test_unload_config_entry(mock_now, hass):
     await hass.async_block_till_done()
     state = hass.states.get("sensor.cert_expiry_timestamp_example_com")
     assert state is None
+
+
+async def test_delay_load_during_startup(hass):
+    """Test delayed loading of a config entry during startup."""
+    hass.state = CoreState.not_running
+
+    entry = MockConfigEntry(domain=DOMAIN, data={CONF_HOST: HOST, CONF_PORT: PORT})
+    entry.add_to_hass(hass)
+
+    assert await async_setup_component(hass, DOMAIN, {}) is True
+    await hass.async_block_till_done()
+
+    assert hass.state is CoreState.not_running
+    assert entry.state is ConfigEntryState.LOADED
+
+    state = hass.states.get("sensor.cert_expiry_timestamp_example_com")
+    assert state is None
+
+    timestamp = future_timestamp(100)
+    with patch(
+        "homeassistant.components.cert_expiry.get_cert_expiry_timestamp",
+        return_value=timestamp,
+    ):
+        await hass.async_start()
+        await hass.async_block_till_done()
+
+    assert hass.state is CoreState.running
+
+    state = hass.states.get("sensor.cert_expiry_timestamp_example_com")
+    assert state.state == timestamp.isoformat()
+    assert state.attributes.get("error") == "None"
+    assert state.attributes.get("is_valid")