diff --git a/.coveragerc b/.coveragerc
index e932be670cb..4df91b250ed 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -277,7 +277,6 @@ omit =
     homeassistant/components/electric_kiwi/__init__.py
     homeassistant/components/electric_kiwi/api.py
     homeassistant/components/electric_kiwi/oauth2.py
-    homeassistant/components/electric_kiwi/sensor.py
     homeassistant/components/electric_kiwi/coordinator.py
     homeassistant/components/electric_kiwi/select.py
     homeassistant/components/eliqonline/sensor.py
diff --git a/homeassistant/components/electric_kiwi/select.py b/homeassistant/components/electric_kiwi/select.py
index 9d883c72d1e..eb8aaac8c2f 100644
--- a/homeassistant/components/electric_kiwi/select.py
+++ b/homeassistant/components/electric_kiwi/select.py
@@ -50,7 +50,10 @@ class ElectricKiwiSelectHOPEntity(
     ) -> None:
         """Initialise the HOP selection entity."""
         super().__init__(coordinator)
-        self._attr_unique_id = f"{coordinator._ek_api.customer_number}_{coordinator._ek_api.connection_id}_{description.key}"
+        self._attr_unique_id = (
+            f"{coordinator._ek_api.customer_number}"
+            f"_{coordinator._ek_api.connection_id}_{description.key}"
+        )
         self.entity_description = description
         self.values_dict = coordinator.get_hop_options()
         self._attr_options = list(self.values_dict)
@@ -58,7 +61,10 @@ class ElectricKiwiSelectHOPEntity(
     @property
     def current_option(self) -> str | None:
         """Return the currently selected option."""
-        return f"{self.coordinator.data.start.start_time} - {self.coordinator.data.end.end_time}"
+        return (
+            f"{self.coordinator.data.start.start_time}"
+            f" - {self.coordinator.data.end.end_time}"
+        )
 
     async def async_select_option(self, option: str) -> None:
         """Change the selected option."""
diff --git a/homeassistant/components/electric_kiwi/sensor.py b/homeassistant/components/electric_kiwi/sensor.py
index 8c983b92dd5..8017bbf006e 100644
--- a/homeassistant/components/electric_kiwi/sensor.py
+++ b/homeassistant/components/electric_kiwi/sensor.py
@@ -62,7 +62,7 @@ def _check_and_move_time(hop: Hop, time: str) -> datetime:
     return date_time
 
 
-HOP_SENSOR_TYPE: tuple[ElectricKiwiHOPSensorEntityDescription, ...] = (
+HOP_SENSOR_TYPES: tuple[ElectricKiwiHOPSensorEntityDescription, ...] = (
     ElectricKiwiHOPSensorEntityDescription(
         key=ATTR_EK_HOP_START,
         translation_key="hopfreepowerstart",
@@ -85,7 +85,7 @@ async def async_setup_entry(
     hop_coordinator: ElectricKiwiHOPDataCoordinator = hass.data[DOMAIN][entry.entry_id]
     hop_entities = [
         ElectricKiwiHOPEntity(hop_coordinator, description)
-        for description in HOP_SENSOR_TYPE
+        for description in HOP_SENSOR_TYPES
     ]
     async_add_entities(hop_entities)
 
@@ -107,7 +107,10 @@ class ElectricKiwiHOPEntity(
         """Entity object for Electric Kiwi sensor."""
         super().__init__(coordinator)
 
-        self._attr_unique_id = f"{coordinator._ek_api.customer_number}_{coordinator._ek_api.connection_id}_{description.key}"
+        self._attr_unique_id = (
+            f"{coordinator._ek_api.customer_number}"
+            f"_{coordinator._ek_api.connection_id}_{description.key}"
+        )
         self.entity_description = description
 
     @property
diff --git a/tests/components/electric_kiwi/conftest.py b/tests/components/electric_kiwi/conftest.py
index 525f5742382..f7e60e975f8 100644
--- a/tests/components/electric_kiwi/conftest.py
+++ b/tests/components/electric_kiwi/conftest.py
@@ -1,9 +1,12 @@
 """Define fixtures for electric kiwi tests."""
 from __future__ import annotations
 
-from collections.abc import Generator
+from collections.abc import Awaitable, Callable, Generator
+from time import time
 from unittest.mock import AsyncMock, patch
+import zoneinfo
 
+from electrickiwi_api.model import Hop, HopIntervals
 import pytest
 
 from homeassistant.components.application_credentials import (
@@ -14,12 +17,17 @@ from homeassistant.components.electric_kiwi.const import DOMAIN
 from homeassistant.core import HomeAssistant
 from homeassistant.setup import async_setup_component
 
-from tests.common import MockConfigEntry
+from tests.common import MockConfigEntry, load_json_value_fixture
 
 CLIENT_ID = "1234"
 CLIENT_SECRET = "5678"
 REDIRECT_URI = "https://example.com/auth/external/callback"
 
+TZ_NAME = "Pacific/Auckland"
+TIMEZONE = zoneinfo.ZoneInfo(TZ_NAME)
+YieldFixture = Generator[AsyncMock, None, None]
+ComponentSetup = Callable[[], Awaitable[bool]]
+
 
 @pytest.fixture(autouse=True)
 async def request_setup(current_request_with_host) -> None:
@@ -28,14 +36,23 @@ async def request_setup(current_request_with_host) -> None:
 
 
 @pytest.fixture
-async def setup_credentials(hass: HomeAssistant) -> None:
-    """Fixture to setup credentials."""
-    assert await async_setup_component(hass, "application_credentials", {})
-    await async_import_client_credential(
-        hass,
-        DOMAIN,
-        ClientCredential(CLIENT_ID, CLIENT_SECRET),
-    )
+def component_setup(
+    hass: HomeAssistant, config_entry: MockConfigEntry
+) -> ComponentSetup:
+    """Fixture for setting up the integration."""
+
+    async def _setup_func() -> bool:
+        assert await async_setup_component(hass, "application_credentials", {})
+        await async_import_client_credential(
+            hass,
+            DOMAIN,
+            ClientCredential(CLIENT_ID, CLIENT_SECRET),
+            DOMAIN,
+        )
+        config_entry.add_to_hass(hass)
+        return await hass.config_entries.async_setup(config_entry.entry_id)
+
+    return _setup_func
 
 
 @pytest.fixture(name="config_entry")
@@ -45,12 +62,18 @@ def mock_config_entry(hass: HomeAssistant) -> MockConfigEntry:
         title="Electric Kiwi",
         domain=DOMAIN,
         data={
-            "id": "mock_user",
+            "id": "12345",
             "auth_implementation": DOMAIN,
+            "token": {
+                "refresh_token": "mock-refresh-token",
+                "access_token": "mock-access-token",
+                "type": "Bearer",
+                "expires_in": 60,
+                "expires_at": time() + 60,
+            },
         },
         unique_id=DOMAIN,
     )
-    entry.add_to_hass(hass)
     return entry
 
 
@@ -61,3 +84,33 @@ def mock_setup_entry() -> Generator[AsyncMock, None, None]:
         "homeassistant.components.electric_kiwi.async_setup_entry", return_value=True
     ) as mock_setup:
         yield mock_setup
+
+
+@pytest.fixture(name="ek_auth")
+def electric_kiwi_auth() -> YieldFixture:
+    """Patch access to electric kiwi access token."""
+    with patch(
+        "homeassistant.components.electric_kiwi.api.AsyncConfigEntryAuth"
+    ) as mock_auth:
+        mock_auth.return_value.async_get_access_token = AsyncMock("auth_token")
+        yield mock_auth
+
+
+@pytest.fixture(name="ek_api")
+def ek_api() -> YieldFixture:
+    """Mock ek api and return values."""
+    with patch(
+        "homeassistant.components.electric_kiwi.ElectricKiwiApi", autospec=True
+    ) as mock_ek_api:
+        mock_ek_api.return_value.customer_number = 123456
+        mock_ek_api.return_value.connection_id = 123456
+        mock_ek_api.return_value.set_active_session.return_value = None
+        mock_ek_api.return_value.get_hop_intervals.return_value = (
+            HopIntervals.from_dict(
+                load_json_value_fixture("hop_intervals.json", DOMAIN)
+            )
+        )
+        mock_ek_api.return_value.get_hop.return_value = Hop.from_dict(
+            load_json_value_fixture("get_hop.json", DOMAIN)
+        )
+        yield mock_ek_api
diff --git a/tests/components/electric_kiwi/fixtures/get_hop.json b/tests/components/electric_kiwi/fixtures/get_hop.json
new file mode 100644
index 00000000000..d29825391e9
--- /dev/null
+++ b/tests/components/electric_kiwi/fixtures/get_hop.json
@@ -0,0 +1,16 @@
+{
+  "data": {
+    "connection_id": "3",
+    "customer_number": 1000001,
+    "end": {
+      "end_time": "5:00 PM",
+      "interval": "34"
+    },
+    "start": {
+      "start_time": "4:00 PM",
+      "interval": "33"
+    },
+    "type": "hop_customer"
+  },
+  "status": 1
+}
diff --git a/tests/components/electric_kiwi/fixtures/hop_intervals.json b/tests/components/electric_kiwi/fixtures/hop_intervals.json
new file mode 100644
index 00000000000..15ecc174f13
--- /dev/null
+++ b/tests/components/electric_kiwi/fixtures/hop_intervals.json
@@ -0,0 +1,249 @@
+{
+  "data": {
+    "hop_duration": "60",
+    "type": "hop_intervals",
+    "intervals": {
+      "1": {
+        "active": 1,
+        "end_time": "1:00 AM",
+        "start_time": "12:00 AM"
+      },
+      "2": {
+        "active": 1,
+        "end_time": "1:30 AM",
+        "start_time": "12:30 AM"
+      },
+      "3": {
+        "active": 1,
+        "end_time": "2:00 AM",
+        "start_time": "1:00 AM"
+      },
+      "4": {
+        "active": 1,
+        "end_time": "2:30 AM",
+        "start_time": "1:30 AM"
+      },
+      "5": {
+        "active": 1,
+        "end_time": "3:00 AM",
+        "start_time": "2:00 AM"
+      },
+      "6": {
+        "active": 1,
+        "end_time": "3:30 AM",
+        "start_time": "2:30 AM"
+      },
+      "7": {
+        "active": 1,
+        "end_time": "4:00 AM",
+        "start_time": "3:00 AM"
+      },
+      "8": {
+        "active": 1,
+        "end_time": "4:30 AM",
+        "start_time": "3:30 AM"
+      },
+      "9": {
+        "active": 1,
+        "end_time": "5:00 AM",
+        "start_time": "4:00 AM"
+      },
+      "10": {
+        "active": 1,
+        "end_time": "5:30 AM",
+        "start_time": "4:30 AM"
+      },
+      "11": {
+        "active": 1,
+        "end_time": "6:00 AM",
+        "start_time": "5:00 AM"
+      },
+      "12": {
+        "active": 1,
+        "end_time": "6:30 AM",
+        "start_time": "5:30 AM"
+      },
+      "13": {
+        "active": 1,
+        "end_time": "7:00 AM",
+        "start_time": "6:00 AM"
+      },
+      "14": {
+        "active": 1,
+        "end_time": "7:30 AM",
+        "start_time": "6:30 AM"
+      },
+      "15": {
+        "active": 1,
+        "end_time": "8:00 AM",
+        "start_time": "7:00 AM"
+      },
+      "16": {
+        "active": 1,
+        "end_time": "8:30 AM",
+        "start_time": "7:30 AM"
+      },
+      "17": {
+        "active": 1,
+        "end_time": "9:00 AM",
+        "start_time": "8:00 AM"
+      },
+      "18": {
+        "active": 1,
+        "end_time": "9:30 AM",
+        "start_time": "8:30 AM"
+      },
+      "19": {
+        "active": 1,
+        "end_time": "10:00 AM",
+        "start_time": "9:00 AM"
+      },
+      "20": {
+        "active": 1,
+        "end_time": "10:30 AM",
+        "start_time": "9:30 AM"
+      },
+      "21": {
+        "active": 1,
+        "end_time": "11:00 AM",
+        "start_time": "10:00 AM"
+      },
+      "22": {
+        "active": 1,
+        "end_time": "11:30 AM",
+        "start_time": "10:30 AM"
+      },
+      "23": {
+        "active": 1,
+        "end_time": "12:00 PM",
+        "start_time": "11:00 AM"
+      },
+      "24": {
+        "active": 1,
+        "end_time": "12:30 PM",
+        "start_time": "11:30 AM"
+      },
+      "25": {
+        "active": 1,
+        "end_time": "1:00 PM",
+        "start_time": "12:00 PM"
+      },
+      "26": {
+        "active": 1,
+        "end_time": "1:30 PM",
+        "start_time": "12:30 PM"
+      },
+      "27": {
+        "active": 1,
+        "end_time": "2:00 PM",
+        "start_time": "1:00 PM"
+      },
+      "28": {
+        "active": 1,
+        "end_time": "2:30 PM",
+        "start_time": "1:30 PM"
+      },
+      "29": {
+        "active": 1,
+        "end_time": "3:00 PM",
+        "start_time": "2:00 PM"
+      },
+      "30": {
+        "active": 1,
+        "end_time": "3:30 PM",
+        "start_time": "2:30 PM"
+      },
+      "31": {
+        "active": 1,
+        "end_time": "4:00 PM",
+        "start_time": "3:00 PM"
+      },
+      "32": {
+        "active": 1,
+        "end_time": "4:30 PM",
+        "start_time": "3:30 PM"
+      },
+      "33": {
+        "active": 1,
+        "end_time": "5:00 PM",
+        "start_time": "4:00 PM"
+      },
+      "34": {
+        "active": 1,
+        "end_time": "5:30 PM",
+        "start_time": "4:30 PM"
+      },
+      "35": {
+        "active": 1,
+        "end_time": "6:00 PM",
+        "start_time": "5:00 PM"
+      },
+      "36": {
+        "active": 1,
+        "end_time": "6:30 PM",
+        "start_time": "5:30 PM"
+      },
+      "37": {
+        "active": 1,
+        "end_time": "7:00 PM",
+        "start_time": "6:00 PM"
+      },
+      "38": {
+        "active": 1,
+        "end_time": "7:30 PM",
+        "start_time": "6:30 PM"
+      },
+      "39": {
+        "active": 1,
+        "end_time": "8:00 PM",
+        "start_time": "7:00 PM"
+      },
+      "40": {
+        "active": 1,
+        "end_time": "8:30 PM",
+        "start_time": "7:30 PM"
+      },
+      "41": {
+        "active": 1,
+        "end_time": "9:00 PM",
+        "start_time": "8:00 PM"
+      },
+      "42": {
+        "active": 1,
+        "end_time": "9:30 PM",
+        "start_time": "8:30 PM"
+      },
+      "43": {
+        "active": 1,
+        "end_time": "10:00 PM",
+        "start_time": "9:00 PM"
+      },
+      "44": {
+        "active": 1,
+        "end_time": "10:30 PM",
+        "start_time": "9:30 PM"
+      },
+      "45": {
+        "active": 1,
+        "end_time": "11:00 AM",
+        "start_time": "10:00 PM"
+      },
+      "46": {
+        "active": 1,
+        "end_time": "11:30 PM",
+        "start_time": "10:30 PM"
+      },
+      "47": {
+        "active": 1,
+        "end_time": "12:00 AM",
+        "start_time": "11:00 PM"
+      },
+      "48": {
+        "active": 1,
+        "end_time": "12:30 AM",
+        "start_time": "11:30 PM"
+      }
+    }
+  },
+  "status": 1
+}
diff --git a/tests/components/electric_kiwi/test_config_flow.py b/tests/components/electric_kiwi/test_config_flow.py
index 51d00722341..1199c3e555a 100644
--- a/tests/components/electric_kiwi/test_config_flow.py
+++ b/tests/components/electric_kiwi/test_config_flow.py
@@ -21,6 +21,7 @@ from homeassistant.config_entries import SOURCE_REAUTH
 from homeassistant.core import HomeAssistant
 from homeassistant.data_entry_flow import FlowResultType
 from homeassistant.helpers import config_entry_oauth2_flow
+from homeassistant.setup import async_setup_component
 
 from .conftest import CLIENT_ID, CLIENT_SECRET, REDIRECT_URI
 
@@ -31,6 +32,17 @@ from tests.typing import ClientSessionGenerator
 pytestmark = pytest.mark.usefixtures("mock_setup_entry")
 
 
+@pytest.fixture
+async def setup_credentials(hass: HomeAssistant) -> None:
+    """Fixture to setup application credentials component."""
+    await async_setup_component(hass, "application_credentials", {})
+    await async_import_client_credential(
+        hass,
+        DOMAIN,
+        ClientCredential(CLIENT_ID, CLIENT_SECRET),
+    )
+
+
 async def test_config_flow_no_credentials(hass: HomeAssistant) -> None:
     """Test config flow base case with no credentials registered."""
     result = await hass.config_entries.flow.async_init(
@@ -45,12 +57,12 @@ async def test_full_flow(
     hass_client_no_auth: ClientSessionGenerator,
     aioclient_mock: AiohttpClientMocker,
     current_request_with_host: None,
-    setup_credentials,
+    setup_credentials: None,
     mock_setup_entry: AsyncMock,
 ) -> None:
     """Check full flow."""
     await async_import_client_credential(
-        hass, DOMAIN, ClientCredential(CLIENT_ID, CLIENT_SECRET), "imported-cred"
+        hass, DOMAIN, ClientCredential(CLIENT_ID, CLIENT_SECRET)
     )
 
     result = await hass.config_entries.flow.async_init(
@@ -103,7 +115,7 @@ async def test_existing_entry(
     config_entry: MockConfigEntry,
 ) -> None:
     """Check existing entry."""
-
+    config_entry.add_to_hass(hass)
     assert len(hass.config_entries.async_entries(DOMAIN)) == 1
 
     result = await hass.config_entries.flow.async_init(
diff --git a/tests/components/electric_kiwi/test_sensor.py b/tests/components/electric_kiwi/test_sensor.py
new file mode 100644
index 00000000000..ef268735334
--- /dev/null
+++ b/tests/components/electric_kiwi/test_sensor.py
@@ -0,0 +1,83 @@
+"""The tests for Electric Kiwi sensors."""
+
+
+from datetime import UTC, datetime
+from unittest.mock import AsyncMock, Mock
+
+from freezegun import freeze_time
+import pytest
+
+from homeassistant.components.electric_kiwi.const import ATTRIBUTION
+from homeassistant.components.electric_kiwi.sensor import _check_and_move_time
+from homeassistant.components.sensor import SensorDeviceClass
+from homeassistant.config_entries import ConfigEntryState
+from homeassistant.const import ATTR_ATTRIBUTION, ATTR_DEVICE_CLASS
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity_registry import EntityRegistry
+import homeassistant.util.dt as dt_util
+
+from .conftest import TIMEZONE, ComponentSetup, YieldFixture
+
+from tests.common import MockConfigEntry
+
+
+@pytest.mark.parametrize(
+    ("sensor", "sensor_state"),
+    [
+        ("sensor.hour_of_free_power_start", "4:00 PM"),
+        ("sensor.hour_of_free_power_end", "5:00 PM"),
+    ],
+)
+async def test_hop_sensors(
+    hass: HomeAssistant,
+    config_entry: MockConfigEntry,
+    ek_api: YieldFixture,
+    ek_auth: YieldFixture,
+    entity_registry: EntityRegistry,
+    component_setup: ComponentSetup,
+    sensor: str,
+    sensor_state: str,
+) -> None:
+    """Test HOP sensors for the Electric Kiwi integration.
+
+    This time (note no day is given, it's only a time) is fed
+    from the Electric Kiwi API. if the API returns 4:00 PM, the
+    sensor state should be set to today at 4pm or if now is past 4pm,
+    then tomorrow at 4pm.
+    """
+    assert await component_setup()
+    assert config_entry.state is ConfigEntryState.LOADED
+
+    entity = entity_registry.async_get(sensor)
+    assert entity
+
+    state = hass.states.get(sensor)
+    assert state
+
+    api = ek_api(Mock())
+    hop_data = await api.get_hop()
+
+    value = _check_and_move_time(hop_data, sensor_state)
+
+    value = value.astimezone(UTC)
+    assert state.state == value.isoformat(timespec="seconds")
+    assert state.attributes.get(ATTR_ATTRIBUTION) == ATTRIBUTION
+    assert state.attributes.get(ATTR_DEVICE_CLASS) == SensorDeviceClass.TIMESTAMP
+
+
+async def test_check_and_move_time(ek_api: AsyncMock) -> None:
+    """Test correct time is returned depending on time of day."""
+    hop = await ek_api(Mock()).get_hop()
+
+    test_time = datetime(2023, 6, 21, 18, 0, 0, tzinfo=TIMEZONE)
+    dt_util.set_default_time_zone(TIMEZONE)
+
+    with freeze_time(test_time):
+        value = _check_and_move_time(hop, "4:00 PM")
+        assert str(value) == "2023-06-22 16:00:00+12:00"
+
+    test_time = test_time.replace(hour=10)
+
+    with freeze_time(test_time):
+        value = _check_and_move_time(hop, "4:00 PM")
+        assert str(value) == "2023-06-21 16:00:00+12:00"