diff --git a/tests/helpers/test_json.py b/tests/helpers/test_json.py
index 30b20c73adf..419122b018b 100644
--- a/tests/helpers/test_json.py
+++ b/tests/helpers/test_json.py
@@ -1,25 +1,37 @@
 """Test Home Assistant remote methods and classes."""
 import datetime
+from functools import partial
 import json
+import math
+import os
+from pathlib import Path
 import time
 from typing import NamedTuple
+from unittest.mock import Mock, patch
 
 import pytest
 
-from homeassistant.core import HomeAssistant, State
+from homeassistant.core import Event, HomeAssistant, State
 from homeassistant.helpers.json import (
     ExtendedJSONEncoder,
-    JSONEncoder,
+    JSONEncoder as DefaultHASSJSONEncoder,
+    find_paths_unserializable_data,
     json_bytes_strip_null,
     json_dumps,
     json_dumps_sorted,
+    save_json,
 )
 from homeassistant.util import dt as dt_util
 from homeassistant.util.color import RGBColor
+from homeassistant.util.json import SerializationError, load_json
+
+# Test data that can be saved as JSON
+TEST_JSON_A = {"a": 1, "B": "two"}
+TEST_JSON_B = {"a": "one", "B": 2}
 
 
-@pytest.mark.parametrize("encoder", (JSONEncoder, ExtendedJSONEncoder))
-def test_json_encoder(hass, encoder):
+@pytest.mark.parametrize("encoder", (DefaultHASSJSONEncoder, ExtendedJSONEncoder))
+def test_json_encoder(hass: HomeAssistant, encoder: type[json.JSONEncoder]) -> None:
     """Test the JSON encoders."""
     ha_json_enc = encoder()
     state = State("test.test", "hello")
@@ -38,7 +50,7 @@ def test_json_encoder(hass, encoder):
 
 def test_json_encoder_raises(hass: HomeAssistant) -> None:
     """Test the JSON encoder raises on unsupported types."""
-    ha_json_enc = JSONEncoder()
+    ha_json_enc = DefaultHASSJSONEncoder()
 
     # Default method raises TypeError if non HA object
     with pytest.raises(TypeError):
@@ -135,3 +147,143 @@ def test_json_bytes_strip_null() -> None:
         json_bytes_strip_null([[{"k1": {"k2": ["silly\0stuff"]}}]])
         == b'[[{"k1":{"k2":["silly"]}}]]'
     )
+
+
+def test_save_and_load(tmp_path: Path) -> None:
+    """Test saving and loading back."""
+    fname = tmp_path / "test1.json"
+    save_json(fname, TEST_JSON_A)
+    data = load_json(fname)
+    assert data == TEST_JSON_A
+
+
+def test_save_and_load_int_keys(tmp_path: Path) -> None:
+    """Test saving and loading back stringifies the keys."""
+    fname = tmp_path / "test1.json"
+    save_json(fname, {1: "a", 2: "b"})
+    data = load_json(fname)
+    assert data == {"1": "a", "2": "b"}
+
+
+def test_save_and_load_private(tmp_path: Path) -> None:
+    """Test we can load private files and that they are protected."""
+    fname = tmp_path / "test2.json"
+    save_json(fname, TEST_JSON_A, private=True)
+    data = load_json(fname)
+    assert data == TEST_JSON_A
+    stats = os.stat(fname)
+    assert stats.st_mode & 0o77 == 0
+
+
+@pytest.mark.parametrize("atomic_writes", [True, False])
+def test_overwrite_and_reload(atomic_writes: bool, tmp_path: Path) -> None:
+    """Test that we can overwrite an existing file and read back."""
+    fname = tmp_path / "test3.json"
+    save_json(fname, TEST_JSON_A, atomic_writes=atomic_writes)
+    save_json(fname, TEST_JSON_B, atomic_writes=atomic_writes)
+    data = load_json(fname)
+    assert data == TEST_JSON_B
+
+
+def test_save_bad_data() -> None:
+    """Test error from trying to save unserializable data."""
+
+    class CannotSerializeMe:
+        """Cannot serialize this."""
+
+    with pytest.raises(SerializationError) as excinfo:
+        save_json("test4", {"hello": CannotSerializeMe()})
+
+    assert "Failed to serialize to JSON: test4. Bad data at $.hello=" in str(
+        excinfo.value
+    )
+
+
+def test_custom_encoder(tmp_path: Path) -> None:
+    """Test serializing with a custom encoder."""
+
+    class MockJSONEncoder(json.JSONEncoder):
+        """Mock JSON encoder."""
+
+        def default(self, o):
+            """Mock JSON encode method."""
+            return "9"
+
+    fname = tmp_path / "test6.json"
+    save_json(fname, Mock(), encoder=MockJSONEncoder)
+    data = load_json(fname)
+    assert data == "9"
+
+
+def test_default_encoder_is_passed(tmp_path: Path) -> None:
+    """Test we use orjson if they pass in the default encoder."""
+    fname = tmp_path / "test6.json"
+    with patch(
+        "homeassistant.helpers.json.orjson.dumps", return_value=b"{}"
+    ) as mock_orjson_dumps:
+        save_json(fname, {"any": 1}, encoder=DefaultHASSJSONEncoder)
+    assert len(mock_orjson_dumps.mock_calls) == 1
+    # Patch json.dumps to make sure we are using the orjson path
+    with patch("homeassistant.helpers.json.json.dumps", side_effect=Exception):
+        save_json(fname, {"any": {1}}, encoder=DefaultHASSJSONEncoder)
+    data = load_json(fname)
+    assert data == {"any": [1]}
+
+
+def test_find_unserializable_data() -> None:
+    """Find unserializeable data."""
+    assert find_paths_unserializable_data(1) == {}
+    assert find_paths_unserializable_data([1, 2]) == {}
+    assert find_paths_unserializable_data({"something": "yo"}) == {}
+
+    assert find_paths_unserializable_data({"something": set()}) == {
+        "$.something": set()
+    }
+    assert find_paths_unserializable_data({"something": [1, set()]}) == {
+        "$.something[1]": set()
+    }
+    assert find_paths_unserializable_data([1, {"bla": set(), "blub": set()}]) == {
+        "$[1].bla": set(),
+        "$[1].blub": set(),
+    }
+    assert find_paths_unserializable_data({("A",): 1}) == {"$<key: ('A',)>": ("A",)}
+    assert math.isnan(
+        find_paths_unserializable_data(
+            float("nan"), dump=partial(json.dumps, allow_nan=False)
+        )["$"]
+    )
+
+    # Test custom encoder + State support.
+
+    class MockJSONEncoder(json.JSONEncoder):
+        """Mock JSON encoder."""
+
+        def default(self, o):
+            """Mock JSON encode method."""
+            if isinstance(o, datetime.datetime):
+                return o.isoformat()
+            return super().default(o)
+
+    bad_data = object()
+
+    assert find_paths_unserializable_data(
+        [State("mock_domain.mock_entity", "on", {"bad": bad_data})],
+        dump=partial(json.dumps, cls=MockJSONEncoder),
+    ) == {"$[0](State: mock_domain.mock_entity).attributes.bad": bad_data}
+
+    assert find_paths_unserializable_data(
+        [Event("bad_event", {"bad_attribute": bad_data})],
+        dump=partial(json.dumps, cls=MockJSONEncoder),
+    ) == {"$[0](Event: bad_event).data.bad_attribute": bad_data}
+
+    class BadData:
+        def __init__(self):
+            self.bla = bad_data
+
+        def as_dict(self):
+            return {"bla": self.bla}
+
+    assert find_paths_unserializable_data(
+        BadData(),
+        dump=partial(json.dumps, cls=MockJSONEncoder),
+    ) == {"$(BadData).bla": bad_data}
diff --git a/tests/util/test_json.py b/tests/util/test_json.py
index 67ead0915ab..c845e8c49a4 100644
--- a/tests/util/test_json.py
+++ b/tests/util/test_json.py
@@ -1,200 +1,26 @@
 """Test Home Assistant json utility functions."""
-from datetime import datetime
-from functools import partial
-from json import JSONEncoder, dumps
-import math
-import os
-from tempfile import mkdtemp
-from unittest.mock import Mock, patch
+from pathlib import Path
 
 import pytest
 
-from homeassistant.core import Event, State
 from homeassistant.exceptions import HomeAssistantError
-from homeassistant.helpers.json import JSONEncoder as DefaultHASSJSONEncoder
-from homeassistant.util.json import (
-    SerializationError,
-    find_paths_unserializable_data,
-    json_loads_array,
-    json_loads_object,
-    load_json,
-    save_json,
-)
+from homeassistant.util.json import json_loads_array, json_loads_object, load_json
 
 # Test data that can be saved as JSON
 TEST_JSON_A = {"a": 1, "B": "two"}
-TEST_JSON_B = {"a": "one", "B": 2}
 # Test data that cannot be loaded as JSON
 TEST_BAD_SERIALIED = "THIS IS NOT JSON\n"
-TMP_DIR = None
 
 
-@pytest.fixture(autouse=True)
-def setup_and_teardown():
-    """Clean up after tests."""
-    global TMP_DIR
-    TMP_DIR = mkdtemp()
-
-    yield
-
-    for fname in os.listdir(TMP_DIR):
-        os.remove(os.path.join(TMP_DIR, fname))
-    os.rmdir(TMP_DIR)
-
-
-def _path_for(leaf_name):
-    return os.path.join(TMP_DIR, f"{leaf_name}.json")
-
-
-def test_save_and_load() -> None:
-    """Test saving and loading back."""
-    fname = _path_for("test1")
-    save_json(fname, TEST_JSON_A)
-    data = load_json(fname)
-    assert data == TEST_JSON_A
-
-
-def test_save_and_load_int_keys() -> None:
-    """Test saving and loading back stringifies the keys."""
-    fname = _path_for("test1")
-    save_json(fname, {1: "a", 2: "b"})
-    data = load_json(fname)
-    assert data == {"1": "a", "2": "b"}
-
-
-def test_save_and_load_private() -> None:
-    """Test we can load private files and that they are protected."""
-    fname = _path_for("test2")
-    save_json(fname, TEST_JSON_A, private=True)
-    data = load_json(fname)
-    assert data == TEST_JSON_A
-    stats = os.stat(fname)
-    assert stats.st_mode & 0o77 == 0
-
-
-@pytest.mark.parametrize("atomic_writes", [True, False])
-def test_overwrite_and_reload(atomic_writes):
-    """Test that we can overwrite an existing file and read back."""
-    fname = _path_for("test3")
-    save_json(fname, TEST_JSON_A, atomic_writes=atomic_writes)
-    save_json(fname, TEST_JSON_B, atomic_writes=atomic_writes)
-    data = load_json(fname)
-    assert data == TEST_JSON_B
-
-
-def test_save_bad_data() -> None:
-    """Test error from trying to save unserializable data."""
-
-    class CannotSerializeMe:
-        """Cannot serialize this."""
-
-    with pytest.raises(SerializationError) as excinfo:
-        save_json("test4", {"hello": CannotSerializeMe()})
-
-    assert "Failed to serialize to JSON: test4. Bad data at $.hello=" in str(
-        excinfo.value
-    )
-
-
-def test_load_bad_data() -> None:
+def test_load_bad_data(tmp_path: Path) -> None:
     """Test error from trying to load unserialisable data."""
-    fname = _path_for("test5")
+    fname = tmp_path / "test5.json"
     with open(fname, "w") as fh:
         fh.write(TEST_BAD_SERIALIED)
     with pytest.raises(HomeAssistantError):
         load_json(fname)
 
 
-def test_custom_encoder() -> None:
-    """Test serializing with a custom encoder."""
-
-    class MockJSONEncoder(JSONEncoder):
-        """Mock JSON encoder."""
-
-        def default(self, o):
-            """Mock JSON encode method."""
-            return "9"
-
-    fname = _path_for("test6")
-    save_json(fname, Mock(), encoder=MockJSONEncoder)
-    data = load_json(fname)
-    assert data == "9"
-
-
-def test_default_encoder_is_passed() -> None:
-    """Test we use orjson if they pass in the default encoder."""
-    fname = _path_for("test6")
-    with patch(
-        "homeassistant.util.json.orjson.dumps", return_value=b"{}"
-    ) as mock_orjson_dumps:
-        save_json(fname, {"any": 1}, encoder=DefaultHASSJSONEncoder)
-    assert len(mock_orjson_dumps.mock_calls) == 1
-    # Patch json.dumps to make sure we are using the orjson path
-    with patch("homeassistant.util.json.json.dumps", side_effect=Exception):
-        save_json(fname, {"any": {1}}, encoder=DefaultHASSJSONEncoder)
-    data = load_json(fname)
-    assert data == {"any": [1]}
-
-
-def test_find_unserializable_data() -> None:
-    """Find unserializeable data."""
-    assert find_paths_unserializable_data(1) == {}
-    assert find_paths_unserializable_data([1, 2]) == {}
-    assert find_paths_unserializable_data({"something": "yo"}) == {}
-
-    assert find_paths_unserializable_data({"something": set()}) == {
-        "$.something": set()
-    }
-    assert find_paths_unserializable_data({"something": [1, set()]}) == {
-        "$.something[1]": set()
-    }
-    assert find_paths_unserializable_data([1, {"bla": set(), "blub": set()}]) == {
-        "$[1].bla": set(),
-        "$[1].blub": set(),
-    }
-    assert find_paths_unserializable_data({("A",): 1}) == {"$<key: ('A',)>": ("A",)}
-    assert math.isnan(
-        find_paths_unserializable_data(
-            float("nan"), dump=partial(dumps, allow_nan=False)
-        )["$"]
-    )
-
-    # Test custom encoder + State support.
-
-    class MockJSONEncoder(JSONEncoder):
-        """Mock JSON encoder."""
-
-        def default(self, o):
-            """Mock JSON encode method."""
-            if isinstance(o, datetime):
-                return o.isoformat()
-            return super().default(o)
-
-    bad_data = object()
-
-    assert find_paths_unserializable_data(
-        [State("mock_domain.mock_entity", "on", {"bad": bad_data})],
-        dump=partial(dumps, cls=MockJSONEncoder),
-    ) == {"$[0](State: mock_domain.mock_entity).attributes.bad": bad_data}
-
-    assert find_paths_unserializable_data(
-        [Event("bad_event", {"bad_attribute": bad_data})],
-        dump=partial(dumps, cls=MockJSONEncoder),
-    ) == {"$[0](Event: bad_event).data.bad_attribute": bad_data}
-
-    class BadData:
-        def __init__(self):
-            self.bla = bad_data
-
-        def as_dict(self):
-            return {"bla": self.bla}
-
-    assert find_paths_unserializable_data(
-        BadData(),
-        dump=partial(dumps, cls=MockJSONEncoder),
-    ) == {"$(BadData).bla": bad_data}
-
-
 def test_json_loads_array() -> None:
     """Test json_loads_array validates result."""
     assert json_loads_array('[{"c":1.2}]') == [{"c": 1.2}]
@@ -233,6 +59,9 @@ async def test_deprecated_test_find_unserializable_data(
     caplog: pytest.LogCaptureFixture,
 ) -> None:
     """Test deprecated test_find_unserializable_data logs a warning."""
+    # pylint: disable-next=hass-deprecated-import,import-outside-toplevel
+    from homeassistant.util.json import find_paths_unserializable_data
+
     find_paths_unserializable_data(1)
     assert (
         "uses find_paths_unserializable_data from homeassistant.util.json"
@@ -241,9 +70,14 @@ async def test_deprecated_test_find_unserializable_data(
     assert "should be updated to use homeassistant.helpers.json module" in caplog.text
 
 
-async def test_deprecated_save_json(caplog: pytest.LogCaptureFixture) -> None:
+async def test_deprecated_save_json(
+    caplog: pytest.LogCaptureFixture, tmp_path: Path
+) -> None:
     """Test deprecated save_json logs a warning."""
-    fname = _path_for("test1")
+    # pylint: disable-next=hass-deprecated-import,import-outside-toplevel
+    from homeassistant.util.json import save_json
+
+    fname = tmp_path / "test1.json"
     save_json(fname, TEST_JSON_A)
     assert "uses save_json from homeassistant.util.json" in caplog.text
     assert "should be updated to use homeassistant.helpers.json module" in caplog.text