From 3153653bf3493c7ff604beae13e008dbec1287cf Mon Sep 17 00:00:00 2001
From: Mika <kontakt@donau2space.de>
Date: Sat, 14 Feb 2026 15:32:02 +0000
Subject: [PATCH] Add drift_detector/tests/test_core.py

---
 drift_detector/tests/test_core.py | 75 +++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 drift_detector/tests/test_core.py

diff --git a/drift_detector/tests/test_core.py b/drift_detector/tests/test_core.py
new file mode 100644
index 0000000..949ca72
--- /dev/null
+++ b/drift_detector/tests/test_core.py
@@ -0,0 +1,75 @@
+import json
+import io
+import tempfile
+import pytest
+from pathlib import Path
+
+import drift_detector.core as core
+
+
+@pytest.fixture
+def sample_jsonl_data():
+    """Fixture to simulate small JSONL dataset containing drift and non-drift paths."""
+    entries = [
+        {"original_path": "data/run_001/file_A.txt"},
+        {"original_path": "data/run_001/file_B.txt"},
+        {"original_path": "data/run_002/file_A.txt"}  # drifted run id
+    ]
+    content = "\n".join(json.dumps(e) for e in entries)
+    tmp = tempfile.NamedTemporaryFile(delete=False, mode="w+t")
+    tmp.write(content)
+    tmp.flush()
+    tmp.seek(0)
+    yield Path(tmp.name)
+    tmp.close()
+    Path(tmp.name).unlink(missing_ok=True)
+
+
+def test_drift_signature_to_dict():
+    sig = core.DriftSignature(
+        normalized_path="data/file.txt",
+        original_path="data/run_001/file.txt",
+        is_drift=True
+    )
+    d = sig.to_dict()
+    assert set(d.keys()) == {"normalized_path", "original_path", "is_drift"}
+    assert d["is_drift"] is True
+    assert "data/" in d["normalized_path"]
+
+
+def test_detect_drift_returns_bool(sample_jsonl_data):
+    result = core.detect_drift(str(sample_jsonl_data))
+    assert isinstance(result, bool)
+
+
+def test_detect_drift_detects_real_drift(tmp_path):
+    data = [
+        {"original_path": "logs/run_01/out.json"},
+        {"original_path": "logs/run_02/out.json"},
+    ]
+    file_path = tmp_path / "data.jsonl"
+    with open(file_path, "w", encoding="utf-8") as f:
+        for row in data:
+            f.write(json.dumps(row) + "\n")
+    res = core.detect_drift(str(file_path))
+    assert res is True  # run_01 vs run_02 induces drift
+
+
+def test_detect_drift_no_drift(tmp_path):
+    data = [
+        {"original_path": "project/data_001/fileA.log"},
+        {"original_path": "project/data_001/fileB.log"},
+    ]
+    file_path = tmp_path / "ok.jsonl"
+    with open(file_path, "w", encoding="utf-8") as f:
+        for r in data:
+            f.write(json.dumps(r) + "\n")
+    res = core.detect_drift(str(file_path))
+    assert res is False
+
+
+def test_detect_drift_invalid_file(tmp_path):
+    empty = tmp_path / "bad.jsonl"
+    empty.write_text("{not valid json}\n", encoding="utf-8")
+    with pytest.raises((ValueError, json.JSONDecodeError)):
+        core.detect_drift(str(empty))