diff --git a/tests/components/ecovacs/test_config_flow.py b/tests/components/ecovacs/test_config_flow.py
index 5bf1144db0b..3a0cb188146 100644
--- a/tests/components/ecovacs/test_config_flow.py
+++ b/tests/components/ecovacs/test_config_flow.py
@@ -1,6 +1,7 @@
 """Test Ecovacs config flow."""
 
 from collections.abc import Awaitable, Callable
+from dataclasses import dataclass, field
 import ssl
 from typing import Any
 from unittest.mock import AsyncMock, Mock, patch
@@ -28,15 +29,20 @@ from .const import (
     VALID_ENTRY_DATA_SELF_HOSTED_WITH_VALIDATE_CERT,
 )
 
+from tests.common import MockConfigEntry
+
 _USER_STEP_SELF_HOSTED = {CONF_MODE: InstanceMode.SELF_HOSTED}
 
-_TEST_FN_AUTH_ARG = "user_input_auth"
-_TEST_FN_USER_ARG = "user_input_user"
+
+@dataclass
+class _TestFnUserInput:
+    auth: dict[str, Any]
+    user: dict[str, Any] = field(default_factory=dict)
 
 
 async def _test_user_flow(
     hass: HomeAssistant,
-    user_input_auth: dict[str, Any],
+    user_input: _TestFnUserInput,
 ) -> dict[str, Any]:
     """Test config flow."""
     result = await hass.config_entries.flow.async_init(
@@ -50,15 +56,13 @@ async def _test_user_flow(
 
     return await hass.config_entries.flow.async_configure(
         result["flow_id"],
-        user_input=user_input_auth,
+        user_input=user_input.auth,
     )
 
 
 async def _test_user_flow_show_advanced_options(
     hass: HomeAssistant,
-    *,
-    user_input_auth: dict[str, Any],
-    user_input_user: dict[str, Any] | None = None,
+    user_input: _TestFnUserInput,
 ) -> dict[str, Any]:
     """Test config flow."""
     result = await hass.config_entries.flow.async_init(
@@ -72,7 +76,7 @@ async def _test_user_flow_show_advanced_options(
 
     result = await hass.config_entries.flow.async_configure(
         result["flow_id"],
-        user_input=user_input_user or {},
+        user_input=user_input.user,
     )
 
     assert result["type"] is FlowResultType.FORM
@@ -81,29 +85,26 @@ async def _test_user_flow_show_advanced_options(
 
     return await hass.config_entries.flow.async_configure(
         result["flow_id"],
-        user_input=user_input_auth,
+        user_input=user_input.auth,
     )
 
 
 @pytest.mark.parametrize(
-    ("test_fn", "test_fn_args", "entry_data"),
+    ("test_fn", "test_fn_user_input", "entry_data"),
     [
         (
             _test_user_flow_show_advanced_options,
-            {_TEST_FN_AUTH_ARG: VALID_ENTRY_DATA_CLOUD},
+            _TestFnUserInput(VALID_ENTRY_DATA_CLOUD),
             VALID_ENTRY_DATA_CLOUD,
         ),
         (
             _test_user_flow_show_advanced_options,
-            {
-                _TEST_FN_AUTH_ARG: VALID_ENTRY_DATA_SELF_HOSTED,
-                _TEST_FN_USER_ARG: _USER_STEP_SELF_HOSTED,
-            },
+            _TestFnUserInput(VALID_ENTRY_DATA_SELF_HOSTED, _USER_STEP_SELF_HOSTED),
             VALID_ENTRY_DATA_SELF_HOSTED,
         ),
         (
             _test_user_flow,
-            {_TEST_FN_AUTH_ARG: VALID_ENTRY_DATA_CLOUD},
+            _TestFnUserInput(VALID_ENTRY_DATA_CLOUD),
             VALID_ENTRY_DATA_CLOUD,
         ),
     ],
@@ -114,18 +115,12 @@ async def test_user_flow(
     mock_setup_entry: AsyncMock,
     mock_authenticator_authenticate: AsyncMock,
     mock_mqtt_client: Mock,
-    test_fn: Callable[[HomeAssistant, dict[str, Any]], Awaitable[dict[str, Any]]]
-    | Callable[
-        [HomeAssistant, dict[str, Any], dict[str, Any]], Awaitable[dict[str, Any]]
-    ],
-    test_fn_args: dict[str, Any],
+    test_fn: Callable[[HomeAssistant, _TestFnUserInput], Awaitable[dict[str, Any]]],
+    test_fn_user_input: _TestFnUserInput,
     entry_data: dict[str, Any],
 ) -> None:
     """Test the user config flow."""
-    result = await test_fn(
-        hass,
-        **test_fn_args,
-    )
+    result = await test_fn(hass, test_fn_user_input)
     assert result["type"] is FlowResultType.CREATE_ENTRY
     assert result["title"] == entry_data[CONF_USERNAME]
     assert result["data"] == entry_data
@@ -161,24 +156,21 @@ def _cannot_connect_error(user_input: dict[str, Any]) -> str:
     ids=["cannot_connect", "invalid_auth", "unknown"],
 )
 @pytest.mark.parametrize(
-    ("test_fn", "test_fn_args", "entry_data"),
+    ("test_fn", "test_fn_user_input", "entry_data"),
     [
         (
             _test_user_flow_show_advanced_options,
-            {_TEST_FN_AUTH_ARG: VALID_ENTRY_DATA_CLOUD},
+            _TestFnUserInput(VALID_ENTRY_DATA_CLOUD),
             VALID_ENTRY_DATA_CLOUD,
         ),
         (
             _test_user_flow_show_advanced_options,
-            {
-                _TEST_FN_AUTH_ARG: VALID_ENTRY_DATA_SELF_HOSTED,
-                _TEST_FN_USER_ARG: _USER_STEP_SELF_HOSTED,
-            },
+            _TestFnUserInput(VALID_ENTRY_DATA_SELF_HOSTED, _USER_STEP_SELF_HOSTED),
             VALID_ENTRY_DATA_SELF_HOSTED_WITH_VALIDATE_CERT,
         ),
         (
             _test_user_flow,
-            {_TEST_FN_AUTH_ARG: VALID_ENTRY_DATA_CLOUD},
+            _TestFnUserInput(VALID_ENTRY_DATA_CLOUD),
             VALID_ENTRY_DATA_CLOUD,
         ),
     ],
@@ -193,22 +185,16 @@ async def test_user_flow_raise_error(
     reason_rest: str,
     side_effect_mqtt: Exception,
     errors_mqtt: Callable[[dict[str, Any]], str],
-    test_fn: Callable[[HomeAssistant, dict[str, Any]], Awaitable[dict[str, Any]]]
-    | Callable[
-        [HomeAssistant, dict[str, Any], dict[str, Any]], Awaitable[dict[str, Any]]
-    ],
-    test_fn_args: dict[str, Any],
+    test_fn: Callable[[HomeAssistant, _TestFnUserInput], Awaitable[dict[str, Any]]],
+    test_fn_user_input: _TestFnUserInput,
     entry_data: dict[str, Any],
 ) -> None:
     """Test handling error on library calls."""
-    user_input_auth = test_fn_args[_TEST_FN_AUTH_ARG]
+    user_input_auth = test_fn_user_input.auth
 
     # Authenticator raises error
     mock_authenticator_authenticate.side_effect = side_effect_rest
-    result = await test_fn(
-        hass,
-        **test_fn_args,
-    )
+    result = await test_fn(hass, test_fn_user_input)
     assert result["type"] is FlowResultType.FORM
     assert result["step_id"] == "auth"
     assert result["errors"] == {"base": reason_rest}
@@ -256,12 +242,14 @@ async def test_user_flow_self_hosted_error(
 
     result = await _test_user_flow_show_advanced_options(
         hass,
-        user_input_auth=VALID_ENTRY_DATA_SELF_HOSTED
-        | {
-            CONF_OVERRIDE_REST_URL: "bla://localhost:8000",
-            CONF_OVERRIDE_MQTT_URL: "mqtt://",
-        },
-        user_input_user=_USER_STEP_SELF_HOSTED,
+        _TestFnUserInput(
+            VALID_ENTRY_DATA_SELF_HOSTED
+            | {
+                CONF_OVERRIDE_REST_URL: "bla://localhost:8000",
+                CONF_OVERRIDE_MQTT_URL: "mqtt://",
+            },
+            _USER_STEP_SELF_HOSTED,
+        ),
     )
 
     assert result["type"] is FlowResultType.FORM
@@ -298,3 +286,39 @@ async def test_user_flow_self_hosted_error(
     mock_setup_entry.assert_called()
     mock_authenticator_authenticate.assert_called()
     mock_mqtt_client.verify_config.assert_called()
+
+
+@pytest.mark.parametrize(
+    ("test_fn", "test_fn_user_input"),
+    [
+        (
+            _test_user_flow_show_advanced_options,
+            _TestFnUserInput(VALID_ENTRY_DATA_CLOUD),
+        ),
+        (
+            _test_user_flow_show_advanced_options,
+            _TestFnUserInput(VALID_ENTRY_DATA_SELF_HOSTED, _USER_STEP_SELF_HOSTED),
+        ),
+        (
+            _test_user_flow,
+            _TestFnUserInput(VALID_ENTRY_DATA_CLOUD),
+        ),
+    ],
+    ids=["advanced_cloud", "advanced_self_hosted", "cloud"],
+)
+async def test_already_exists(
+    hass: HomeAssistant,
+    test_fn: Callable[[HomeAssistant, _TestFnUserInput], Awaitable[dict[str, Any]]],
+    test_fn_user_input: _TestFnUserInput,
+) -> None:
+    """Test we don't allow duplicated config entries."""
+    MockConfigEntry(domain=DOMAIN, data=test_fn_user_input.auth).add_to_hass(hass)
+
+    result = await test_fn(
+        hass,
+        test_fn_user_input,
+    )
+
+    assert result
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "already_configured"