diff --git a/tests/components/cert_expiry/test_config_flow.py b/tests/components/cert_expiry/test_config_flow.py
index d59d60b11da..e5d90e12d13 100644
--- a/tests/components/cert_expiry/test_config_flow.py
+++ b/tests/components/cert_expiry/test_config_flow.py
@@ -164,7 +164,7 @@ async def test_bad_import(hass):
 async def test_abort_if_already_setup(hass):
     """Test we abort if the cert is already setup."""
     MockConfigEntry(
-        domain="cert_expiry",
+        domain=DOMAIN,
         data={CONF_HOST: HOST, CONF_PORT: PORT},
         unique_id=f"{HOST}:{PORT}",
     ).add_to_hass(hass)
diff --git a/tests/components/cert_expiry/test_sensors.py b/tests/components/cert_expiry/test_sensors.py
index 66df9e60c57..f58534bc612 100644
--- a/tests/components/cert_expiry/test_sensors.py
+++ b/tests/components/cert_expiry/test_sensors.py
@@ -3,6 +3,7 @@ from datetime import timedelta
 import socket
 import ssl
 
+from homeassistant.components.cert_expiry.const import DOMAIN
 from homeassistant.config_entries import ENTRY_STATE_SETUP_RETRY
 from homeassistant.const import CONF_HOST, CONF_PORT, STATE_UNAVAILABLE, STATE_UNKNOWN
 import homeassistant.util.dt as dt_util
@@ -18,7 +19,7 @@ from tests.common import MockConfigEntry, async_fire_time_changed
 async def test_async_setup_entry(mock_now, hass):
     """Test async_setup_entry."""
     entry = MockConfigEntry(
-        domain="cert_expiry",
+        domain=DOMAIN,
         data={CONF_HOST: HOST, CONF_PORT: PORT},
         unique_id=f"{HOST}:{PORT}",
     )
@@ -51,7 +52,7 @@ async def test_async_setup_entry(mock_now, hass):
 async def test_async_setup_entry_bad_cert(hass):
     """Test async_setup_entry with a bad/expired cert."""
     entry = MockConfigEntry(
-        domain="cert_expiry",
+        domain=DOMAIN,
         data={CONF_HOST: HOST, CONF_PORT: PORT},
         unique_id=f"{HOST}:{PORT}",
     )
@@ -75,7 +76,7 @@ async def test_async_setup_entry_bad_cert(hass):
 async def test_async_setup_entry_host_unavailable(hass):
     """Test async_setup_entry when host is unavailable."""
     entry = MockConfigEntry(
-        domain="cert_expiry",
+        domain=DOMAIN,
         data={CONF_HOST: HOST, CONF_PORT: PORT},
         unique_id=f"{HOST}:{PORT}",
     )
@@ -106,7 +107,7 @@ async def test_async_setup_entry_host_unavailable(hass):
 async def test_update_sensor(mock_now, hass):
     """Test async_update for sensor."""
     entry = MockConfigEntry(
-        domain="cert_expiry",
+        domain=DOMAIN,
         data={CONF_HOST: HOST, CONF_PORT: PORT},
         unique_id=f"{HOST}:{PORT}",
     )
@@ -121,6 +122,8 @@ async def test_update_sensor(mock_now, hass):
         assert await hass.config_entries.async_setup(entry.entry_id)
         await hass.async_block_till_done()
 
+    coordinator = hass.data[DOMAIN][entry.entry_id]
+
     state = hass.states.get("sensor.cert_expiry_example_com")
     assert state is not None
     assert state.state != STATE_UNAVAILABLE
@@ -137,13 +140,11 @@ async def test_update_sensor(mock_now, hass):
 
     timestamp2 = future_timestamp(99)
 
-    next_update = dt_util.utcnow() + timedelta(hours=12)
-    async_fire_time_changed(hass, next_update)
-
     with patch(
         "homeassistant.components.cert_expiry.get_cert_expiry_timestamp",
         return_value=timestamp2,
     ):
+        await coordinator.async_refresh()
         await hass.async_block_till_done()
 
     state = hass.states.get("sensor.cert_expiry_example_com")
@@ -165,7 +166,7 @@ async def test_update_sensor(mock_now, hass):
 async def test_update_sensor_network_errors(mock_now, hass):
     """Test async_update for sensor."""
     entry = MockConfigEntry(
-        domain="cert_expiry",
+        domain=DOMAIN,
         data={CONF_HOST: HOST, CONF_PORT: PORT},
         unique_id=f"{HOST}:{PORT}",
     )
@@ -180,6 +181,8 @@ async def test_update_sensor_network_errors(mock_now, hass):
         assert await hass.config_entries.async_setup(entry.entry_id)
         await hass.async_block_till_done()
 
+    coordinator = hass.data[DOMAIN][entry.entry_id]
+
     state = hass.states.get("sensor.cert_expiry_example_com")
     assert state is not None
     assert state.state != STATE_UNAVAILABLE
@@ -194,25 +197,21 @@ async def test_update_sensor_network_errors(mock_now, hass):
     assert state.attributes.get("error") == "None"
     assert state.attributes.get("is_valid")
 
-    next_update = dt_util.utcnow() + timedelta(hours=12)
-    async_fire_time_changed(hass, next_update)
-
     with patch(
         "homeassistant.components.cert_expiry.helper.get_cert",
         side_effect=socket.gaierror,
     ):
+        await coordinator.async_refresh()
         await hass.async_block_till_done()
 
     state = hass.states.get("sensor.cert_expiry_example_com")
     assert state.state == STATE_UNAVAILABLE
 
-    next_update = dt_util.utcnow() + timedelta(hours=12)
-    async_fire_time_changed(hass, next_update)
-
     with patch(
         "homeassistant.components.cert_expiry.get_cert_expiry_timestamp",
         return_value=future_timestamp(99),
     ):
+        await coordinator.async_refresh()
         await hass.async_block_till_done()
 
     state = hass.states.get("sensor.cert_expiry_example_com")
@@ -222,13 +221,11 @@ async def test_update_sensor_network_errors(mock_now, hass):
     assert state.attributes.get("error") == "None"
     assert state.attributes.get("is_valid")
 
-    next_update = dt_util.utcnow() + timedelta(hours=12)
-    async_fire_time_changed(hass, next_update)
-
     with patch(
         "homeassistant.components.cert_expiry.helper.get_cert",
         side_effect=ssl.SSLError("something bad"),
     ):
+        await coordinator.async_refresh()
         await hass.async_block_till_done()
 
     state = hass.states.get("sensor.cert_expiry_example_com")
@@ -244,12 +241,10 @@ async def test_update_sensor_network_errors(mock_now, hass):
     assert state.attributes.get("error") == "something bad"
     assert not state.attributes.get("is_valid")
 
-    next_update = dt_util.utcnow() + timedelta(hours=12)
-    async_fire_time_changed(hass, next_update)
-
     with patch(
         "homeassistant.components.cert_expiry.helper.get_cert", side_effect=Exception()
     ):
+        await coordinator.async_refresh()
         await hass.async_block_till_done()
 
     state = hass.states.get("sensor.cert_expiry_example_com")