diff --git a/tests/components/fan/common.py b/tests/components/fan/common.py
index 7955a91bc0a..e9919c865c8 100644
--- a/tests/components/fan/common.py
+++ b/tests/components/fan/common.py
@@ -17,6 +17,7 @@ from homeassistant.components.fan import (
     SERVICE_SET_DIRECTION,
     SERVICE_SET_PERCENTAGE,
     SERVICE_SET_PRESET_MODE,
+    FanEntity,
 )
 from homeassistant.const import (
     ATTR_ENTITY_ID,
@@ -25,6 +26,8 @@ from homeassistant.const import (
     SERVICE_TURN_ON,
 )
 
+from tests.common import MockEntity
+
 
 async def async_turn_on(
     hass,
@@ -146,3 +149,27 @@ async def async_set_direction(
 
     await hass.services.async_call(DOMAIN, SERVICE_SET_DIRECTION, data, blocking=True)
     await hass.async_block_till_done()
+
+
+class MockFan(MockEntity, FanEntity):
+    """Mock Fan class."""
+
+    @property
+    def preset_mode(self) -> str | None:
+        """Return preset mode."""
+        return self._handle("preset_mode")
+
+    @property
+    def preset_modes(self) -> list[str] | None:
+        """Return preset mode."""
+        return self._handle("preset_modes")
+
+    @property
+    def supported_features(self):
+        """Return the class of this fan."""
+        return self._handle("supported_features")
+
+    async def async_set_preset_mode(self, preset_mode: str) -> None:
+        """Set preset mode."""
+        self._attr_preset_mode = preset_mode
+        self.async_write_ha_state()
diff --git a/tests/components/fan/test_init.py b/tests/components/fan/test_init.py
index 911954d1ecd..e6bcc5542bd 100644
--- a/tests/components/fan/test_init.py
+++ b/tests/components/fan/test_init.py
@@ -16,8 +16,12 @@ from homeassistant.core import HomeAssistant
 import homeassistant.helpers.entity_registry as er
 from homeassistant.setup import async_setup_component
 
-from tests.common import help_test_all, import_and_test_deprecated_constant_enum
-from tests.testing_config.custom_components.test.fan import MockFan
+from tests.common import (
+    help_test_all,
+    import_and_test_deprecated_constant_enum,
+    setup_test_component_platform,
+)
+from tests.components.fan.common import MockFan
 
 
 class BaseFan(FanEntity):
@@ -103,21 +107,21 @@ async def test_preset_mode_validation(
     hass: HomeAssistant,
     caplog: pytest.LogCaptureFixture,
     entity_registry: er.EntityRegistry,
-    enable_custom_integrations: None,
 ) -> None:
     """Test preset mode validation."""
-
     await hass.async_block_till_done()
 
-    platform = getattr(hass.components, "test.fan")
-    platform.init(empty=False)
+    test_fan = MockFan(
+        name="Support fan with preset_mode support",
+        supported_features=FanEntityFeature.PRESET_MODE,
+        unique_id="unique_support_preset_mode",
+        preset_modes=["auto", "eco"],
+    )
+    setup_test_component_platform(hass, "fan", [test_fan])
 
     assert await async_setup_component(hass, "fan", {"fan": {"platform": "test"}})
     await hass.async_block_till_done()
 
-    test_fan: MockFan = platform.ENTITIES["support_preset_mode"]
-    await hass.async_block_till_done()
-
     state = hass.states.get("fan.support_fan_with_preset_mode_support")
     assert state.attributes.get(ATTR_PRESET_MODES) == ["auto", "eco"]
 
diff --git a/tests/testing_config/custom_components/test/fan.py b/tests/testing_config/custom_components/test/fan.py
deleted file mode 100644
index cc38972bc71..00000000000
--- a/tests/testing_config/custom_components/test/fan.py
+++ /dev/null
@@ -1,65 +0,0 @@
-"""Provide a mock fan platform.
-
-Call init before using it in your tests to ensure clean test data.
-"""
-
-from homeassistant.components.fan import FanEntity, FanEntityFeature
-from homeassistant.core import HomeAssistant
-from homeassistant.helpers.entity_platform import AddEntitiesCallback
-from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
-
-from tests.common import MockEntity
-
-ENTITIES = {}
-
-
-def init(empty=False):
-    """Initialize the platform with entities."""
-    global ENTITIES
-
-    ENTITIES = (
-        {}
-        if empty
-        else {
-            "support_preset_mode": MockFan(
-                name="Support fan with preset_mode support",
-                supported_features=FanEntityFeature.PRESET_MODE,
-                unique_id="unique_support_preset_mode",
-                preset_modes=["auto", "eco"],
-            )
-        }
-    )
-
-
-async def async_setup_platform(
-    hass: HomeAssistant,
-    config: ConfigType,
-    async_add_entities_callback: AddEntitiesCallback,
-    discovery_info: DiscoveryInfoType | None = None,
-):
-    """Return mock entities."""
-    async_add_entities_callback(list(ENTITIES.values()))
-
-
-class MockFan(MockEntity, FanEntity):
-    """Mock Fan class."""
-
-    @property
-    def preset_mode(self) -> str | None:
-        """Return preset mode."""
-        return self._handle("preset_mode")
-
-    @property
-    def preset_modes(self) -> list[str] | None:
-        """Return preset mode."""
-        return self._handle("preset_modes")
-
-    @property
-    def supported_features(self):
-        """Return the class of this fan."""
-        return self._handle("supported_features")
-
-    async def async_set_preset_mode(self, preset_mode: str) -> None:
-        """Set preset mode."""
-        self._attr_preset_mode = preset_mode
-        await self.async_update_ha_state()