🎉 Initial commit

tests/test_detectors.py

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+"""Detector tests (SPECIFICATION §6). Detector implementations land in Phase 1."""
+
+from datetime import datetime, timezone
+
+from opcda_diagnozer.monitor.detectors import PollOutcome
+from opcda_diagnozer.opc.base import ReadResult
+
+
+def test_poll_outcome_holds_one_cycle() -> None:
+    result = ReadResult(
+        tag="Channel1.Device1.Level", value=1.5, quality_raw=0xC0, device_time=None
+    )
+    outcome = PollOutcome(
+        started_at=datetime.now(timezone.utc),
+        rtt_ms=12.5,
+        results=(result,),
+    )
+    assert outcome.rtt_ms == 12.5
+    assert outcome.error is None
+    assert outcome.results[0].tag == "Channel1.Device1.Level"