diff --git a/tests/util/test_temperature.py b/tests/util/test_temperature.py
index 7730a89cbb8..71693683fa3 100644
--- a/tests/util/test_temperature.py
+++ b/tests/util/test_temperature.py
@@ -8,6 +8,23 @@ INVALID_SYMBOL = "bob"
 VALID_SYMBOL = TEMP_CELSIUS
 
 
+@pytest.mark.parametrize(
+    "function_name, value, expected",
+    [
+        ("fahrenheit_to_celsius", 75.2, 24),
+        ("kelvin_to_celsius", 297.65, 24.5),
+        ("celsius_to_fahrenheit", 23, 73.4),
+        ("celsius_to_kelvin", 23, 296.15),
+    ],
+)
+def test_deprecated_functions(
+    function_name: str, value: float, expected: float
+) -> None:
+    """Test that deprecated function still work."""
+    convert = getattr(temperature_util, function_name)
+    assert convert(value) == expected
+
+
 def test_convert_same_unit():
     """Test conversion from any unit to same unit."""
     assert temperature_util.convert(2, TEMP_CELSIUS, TEMP_CELSIUS) == 2
diff --git a/tests/util/test_volume.py b/tests/util/test_volume.py
index f78d6c4ed18..5362f3099fb 100644
--- a/tests/util/test_volume.py
+++ b/tests/util/test_volume.py
@@ -16,6 +16,23 @@ INVALID_SYMBOL = "bob"
 VALID_SYMBOL = VOLUME_LITERS
 
 
+@pytest.mark.parametrize(
+    "function_name, value, expected",
+    [
+        ("liter_to_gallon", 2, pytest.approx(0.528344)),
+        ("gallon_to_liter", 2, 7.570823568),
+        ("cubic_meter_to_cubic_feet", 2, pytest.approx(70.629333)),
+        ("cubic_feet_to_cubic_meter", 2, pytest.approx(0.0566337)),
+    ],
+)
+def test_deprecated_functions(
+    function_name: str, value: float, expected: float
+) -> None:
+    """Test that deprecated function still work."""
+    convert = getattr(volume_util, function_name)
+    assert convert(value) == expected
+
+
 def test_convert_same_unit():
     """Test conversion from any unit to same unit."""
     assert volume_util.convert(2, VOLUME_LITERS, VOLUME_LITERS) == 2