Issue #46: implement Python async client values errors and CLI

clients/python/tests/test_values.py

@@ -0,0 +1,49 @@
+"""Tests for MXAccess value conversion helpers."""
+
+import json
+import re
+from datetime import datetime, timezone
+from pathlib import Path
+
+from google.protobuf.json_format import ParseDict
+
+from mxgateway.generated import mxaccess_gateway_pb2 as pb
+from mxgateway.values import from_mx_value, to_mx_value
+
+FIXTURE_ROOT = Path(__file__).resolve().parents[2] / "proto" / "fixtures" / "behavior"
+
+
+def test_value_conversion_fixtures_project_expected_oneof_kind() -> None:
+    payload = json.loads(
+        (FIXTURE_ROOT / "values" / "value-conversion-cases.json").read_text(
+            encoding="utf-8",
+        ),
+    )
+
+    for case in payload["cases"]:
+        value = ParseDict(case["value"], pb.MxValue())
+        projection = from_mx_value(value)
+
+        assert projection.kind == _snake_case(case["expectedKind"])
+        assert projection.raw is value
+
+
+def test_to_mx_value_supports_scalar_and_array_inputs() -> None:
+    assert to_mx_value(True).WhichOneof("kind") == "bool_value"
+    assert to_mx_value(12).int32_value == 12
+    assert to_mx_value(2**40).int64_value == 2**40
+    assert to_mx_value(12.5).double_value == 12.5
+    assert to_mx_value("abc").string_value == "abc"
+    assert to_mx_value([1, 2]).array_value.int32_values.values == [1, 2]
+    assert to_mx_value(["a", "b"]).array_value.string_values.values == ["a", "b"]
+
+
+def test_to_mx_value_uses_utc_timestamps() -> None:
+    value = to_mx_value(datetime(2026, 1, 1, 0, 0, 4, tzinfo=timezone.utc))
+
+    assert value.data_type == pb.MX_DATA_TYPE_TIME
+    assert value.timestamp_value.seconds == 1767225604
+
+
+def _snake_case(value: str) -> str:
+    return re.sub(r"(?<!^)(?=[A-Z])", "_", value).lower()