diff --git a/tests/components/nina/test_config_flow.py b/tests/components/nina/test_config_flow.py
index a93cecdd102..9d4a0e9376d 100644
--- a/tests/components/nina/test_config_flow.py
+++ b/tests/components/nina/test_config_flow.py
@@ -1,6 +1,7 @@
 """Test the Nina config flow."""
 from __future__ import annotations
 
+from copy import deepcopy
 import json
 from typing import Any
 from unittest.mock import patch
@@ -70,7 +71,7 @@ async def test_step_user_connection_error(hass: HomeAssistant) -> None:
     ):
 
         result: dict[str, Any] = await hass.config_entries.flow.async_init(
-            DOMAIN, context={"source": SOURCE_USER}, data=DUMMY_DATA
+            DOMAIN, context={"source": SOURCE_USER}, data=deepcopy(DUMMY_DATA)
         )
 
         assert result["type"] == data_entry_flow.FlowResultType.FORM
@@ -85,7 +86,7 @@ async def test_step_user_unexpected_exception(hass: HomeAssistant) -> None:
     ):
 
         result: dict[str, Any] = await hass.config_entries.flow.async_init(
-            DOMAIN, context={"source": SOURCE_USER}, data=DUMMY_DATA
+            DOMAIN, context={"source": SOURCE_USER}, data=deepcopy(DUMMY_DATA)
         )
 
         assert result["type"] == data_entry_flow.FlowResultType.ABORT
@@ -102,7 +103,7 @@ async def test_step_user(hass: HomeAssistant) -> None:
     ):
 
         result: dict[str, Any] = await hass.config_entries.flow.async_init(
-            DOMAIN, context={"source": SOURCE_USER}, data=DUMMY_DATA
+            DOMAIN, context={"source": SOURCE_USER}, data=deepcopy(DUMMY_DATA)
         )
 
         assert result["type"] == data_entry_flow.FlowResultType.CREATE_ENTRY
@@ -132,11 +133,11 @@ async def test_step_user_already_configured(hass: HomeAssistant) -> None:
         wraps=mocked_request_function,
     ):
         result: dict[str, Any] = await hass.config_entries.flow.async_init(
-            DOMAIN, context={"source": SOURCE_USER}, data=DUMMY_DATA
+            DOMAIN, context={"source": SOURCE_USER}, data=deepcopy(DUMMY_DATA)
         )
 
         result = await hass.config_entries.flow.async_init(
-            DOMAIN, context={"source": SOURCE_USER}, data=DUMMY_DATA
+            DOMAIN, context={"source": SOURCE_USER}, data=deepcopy(DUMMY_DATA)
         )
 
         assert result["type"] == data_entry_flow.FlowResultType.ABORT
@@ -149,9 +150,9 @@ async def test_options_flow_init(hass: HomeAssistant) -> None:
         domain=DOMAIN,
         title="NINA",
         data={
-            CONF_FILTER_CORONA: DUMMY_DATA[CONF_FILTER_CORONA],
-            CONF_MESSAGE_SLOTS: DUMMY_DATA[CONF_MESSAGE_SLOTS],
-            CONST_REGION_A_TO_D: DUMMY_DATA[CONST_REGION_A_TO_D],
+            CONF_FILTER_CORONA: deepcopy(DUMMY_DATA[CONF_FILTER_CORONA]),
+            CONF_MESSAGE_SLOTS: deepcopy(DUMMY_DATA[CONF_MESSAGE_SLOTS]),
+            CONST_REGION_A_TO_D: deepcopy(DUMMY_DATA[CONST_REGION_A_TO_D]),
             CONF_REGIONS: {"095760000000": "Aach"},
         },
     )
@@ -187,8 +188,8 @@ async def test_options_flow_init(hass: HomeAssistant) -> None:
         assert result["data"] is None
 
         assert dict(config_entry.data) == {
-            CONF_FILTER_CORONA: DUMMY_DATA[CONF_FILTER_CORONA],
-            CONF_MESSAGE_SLOTS: DUMMY_DATA[CONF_MESSAGE_SLOTS],
+            CONF_FILTER_CORONA: deepcopy(DUMMY_DATA[CONF_FILTER_CORONA]),
+            CONF_MESSAGE_SLOTS: deepcopy(DUMMY_DATA[CONF_MESSAGE_SLOTS]),
             CONST_REGION_A_TO_D: ["072350000000_1"],
             CONST_REGION_E_TO_H: [],
             CONST_REGION_I_TO_L: [],
@@ -206,7 +207,7 @@ async def test_options_flow_with_no_selection(hass: HomeAssistant) -> None:
     config_entry = MockConfigEntry(
         domain=DOMAIN,
         title="NINA",
-        data=DUMMY_DATA,
+        data=deepcopy(DUMMY_DATA),
     )
     config_entry.add_to_hass(hass)
 
@@ -246,7 +247,7 @@ async def test_options_flow_connection_error(hass: HomeAssistant) -> None:
     config_entry = MockConfigEntry(
         domain=DOMAIN,
         title="NINA",
-        data=DUMMY_DATA,
+        data=deepcopy(DUMMY_DATA),
     )
     config_entry.add_to_hass(hass)
 
@@ -271,7 +272,7 @@ async def test_options_flow_unexpected_exception(hass: HomeAssistant) -> None:
     config_entry = MockConfigEntry(
         domain=DOMAIN,
         title="NINA",
-        data=DUMMY_DATA,
+        data=deepcopy(DUMMY_DATA),
     )
     config_entry.add_to_hass(hass)
 
@@ -295,7 +296,7 @@ async def test_options_flow_entity_removal(hass: HomeAssistant) -> None:
     config_entry = MockConfigEntry(
         domain=DOMAIN,
         title="NINA",
-        data=DUMMY_DATA,
+        data=deepcopy(DUMMY_DATA) | {CONF_REGIONS: {"095760000000": "Aach"}},
     )
     config_entry.add_to_hass(hass)