diff --git a/tests/unit/test_convert.py b/tests/unit/test_convert.py
new file mode 100644
index 0000000..a14a359
--- /dev/null
+++ b/tests/unit/test_convert.py
@@ -0,0 +1,131 @@
+from typing import Any, Type, Union
+
+import pytest
+from google.protobuf import any_pb2, wrappers_pb2
+from ni.pythonpanel.v1 import python_panel_types_pb2
+from typing_extensions import TypeAlias
+
+import nipanel._convert
+
+
+_AnyWrappersPb2: TypeAlias = Union[
+    wrappers_pb2.BoolValue,
+    wrappers_pb2.BytesValue,
+    wrappers_pb2.DoubleValue,
+    wrappers_pb2.Int64Value,
+    wrappers_pb2.StringValue,
+]
+
+_AnyPanelPbTypes: TypeAlias = Union[
+    python_panel_types_pb2.BoolCollection,
+    python_panel_types_pb2.ByteStringCollection,
+    python_panel_types_pb2.FloatCollection,
+    python_panel_types_pb2.IntCollection,
+    python_panel_types_pb2.StringCollection,
+]
+
+
+# ========================================================
+# Python to Protobuf
+# ========================================================
+@pytest.mark.parametrize(
+    "proto_type, default_value, expected_value",
+    [
+        (wrappers_pb2.BoolValue, False, True),
+        (wrappers_pb2.BytesValue, b"", b"mystr"),
+        (wrappers_pb2.DoubleValue, 0.0, 456.2),
+        (wrappers_pb2.Int64Value, 0, 123),
+        (wrappers_pb2.StringValue, "", "mystr"),
+    ],
+)
+def test___python_builtin_scalar___to_any___valid_wrapperpb2_value(
+    proto_type: Type[_AnyWrappersPb2], default_value: Any, expected_value: Any
+) -> None:
+    result = nipanel._convert.to_any(expected_value)
+    unpack_dest = proto_type(value=default_value)
+    _assert_any_and_unpack(result, unpack_dest)
+
+    assert isinstance(unpack_dest, proto_type)
+    assert unpack_dest.value == expected_value
+
+
+@pytest.mark.parametrize(
+    "proto_type, default_value, expected_value",
+    [
+        (python_panel_types_pb2.BoolCollection, [False, False, False], [True, True, True]),
+        (python_panel_types_pb2.ByteStringCollection, [b"", b"", b""], [b"a", b"b", b"c"]),
+        (python_panel_types_pb2.FloatCollection, [0.0, 0.0, 0.0], [1.0, 2.0, 3.0]),
+        (python_panel_types_pb2.IntCollection, [0, 0, 0], [1, 2, 3]),
+        (python_panel_types_pb2.StringCollection, ["", "", ""], ["a", "b", "c"]),
+    ],
+)
+def test___python_panel_collection___to_any___valid_paneltype_value(
+    proto_type: Type[_AnyPanelPbTypes], default_value: Any, expected_value: Any
+) -> None:
+    result = nipanel._convert.to_any(expected_value)
+    unpack_dest = proto_type(values=default_value)
+    _assert_any_and_unpack(result, unpack_dest)
+
+    assert isinstance(unpack_dest, proto_type)
+    assert unpack_dest.values == expected_value
+
+
+# ========================================================
+# Protobuf to Python
+# ========================================================
+@pytest.mark.parametrize(
+    "proto_type, expected_value",
+    [
+        (wrappers_pb2.BoolValue, True),
+        (wrappers_pb2.BytesValue, b"mystr"),
+        (wrappers_pb2.DoubleValue, 456.2),
+        (wrappers_pb2.Int64Value, 123),
+        (wrappers_pb2.StringValue, "mystr"),
+    ],
+)
+def test___wrapperpb2_value___from_any___valid_python_value(
+    proto_type: Type[_AnyWrappersPb2], expected_value: Any
+) -> None:
+    pb_value = proto_type(value=expected_value)
+    packed_any = _pack_into_any(pb_value)
+
+    result = nipanel._convert.from_any(packed_any)
+
+    assert isinstance(result, type(expected_value))
+    assert result == expected_value
+
+
+@pytest.mark.parametrize(
+    "proto_type, expected_value",
+    [
+        (python_panel_types_pb2.BoolCollection, [True, True, True]),
+        (python_panel_types_pb2.ByteStringCollection, [b"a", b"b", b"c"]),
+        (python_panel_types_pb2.FloatCollection, [1.0, 2.0, 3.0]),
+        (python_panel_types_pb2.IntCollection, [1, 2, 3]),
+        (python_panel_types_pb2.StringCollection, ["a", "b", "c"]),
+    ],
+)
+def test___paneltype_value___from_any___valid_python_value(
+    proto_type: Type[_AnyPanelPbTypes], expected_value: Any
+) -> None:
+    pb_value = proto_type(values=expected_value)
+    packed_any = _pack_into_any(pb_value)
+
+    result = nipanel._convert.from_any(packed_any)
+
+    assert isinstance(result, type(expected_value))
+    assert result == expected_value
+
+
+# ========================================================
+# Pack/Unpack Helpers
+# ========================================================
+def _assert_any_and_unpack(packed_message: any_pb2.Any, unpack_destination: Any) -> None:
+    assert isinstance(packed_message, any_pb2.Any)
+    assert packed_message.Unpack(unpack_destination)
+
+
+def _pack_into_any(proto_value: Union[_AnyWrappersPb2, _AnyPanelPbTypes]) -> any_pb2.Any:
+    as_any = any_pb2.Any()
+    as_any.Pack(proto_value)
+    return as_any