Prepared for playback engine

test/test_dlpak.py

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+import logging
+from datetime import datetime, timezone
+from uuid import uuid4
+
+import pytest
+from dynalab_core.buffer import ValueBuffer
+from dynalab_core.dlpak import DLPak
+from dynalab_core.protocols.packets.handshake import SignalDescriptor
+
+
+def test_dlpak_logs_written_archive(caplog: pytest.LogCaptureFixture, tmp_path) -> None:
+    signal = SignalDescriptor(id=uuid4(), name="Signal", type="number")
+    buffer = ValueBuffer()
+    buffer.append(1, signal.id, 2.0)
+    package = DLPak()
+    package.set_data(buffer)
+    package.set_manifest(datetime.now(timezone.utc), [signal])
+
+    with caplog.at_level(logging.INFO, logger="dynalab_core"):
+        package.write(tmp_path, "recording")
+
+    record = next(
+        record
+        for record in caplog.records
+        if getattr(record, "event", None) == "dlpak.written"
+    )
+    assert record.output_filename == "recording.dlpak"
+    assert record.sample_count == 1
+    assert record.signal_count == 1