From 109d89732827c2bf1a03a66eb2e0996d1d1c6242 Mon Sep 17 00:00:00 2001
From: Mika <kontakt@donau2space.de>
Date: Thu, 29 Jan 2026 16:23:27 +0000
Subject: [PATCH] Add drift_analysis/tests/test_core.py

---
 drift_analysis/tests/test_core.py | 64 +++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 drift_analysis/tests/test_core.py

diff --git a/drift_analysis/tests/test_core.py b/drift_analysis/tests/test_core.py
new file mode 100644
index 0000000..64a9c5a
--- /dev/null
+++ b/drift_analysis/tests/test_core.py
@@ -0,0 +1,64 @@
+import json
+import pytest
+from pathlib import Path
+
+import drift_analysis.core as core
+
+@pytest.fixture
+def sample_frozen_runs(tmp_path: Path):
+    data = [
+        {"run_id": "r1", "status": "PASS", "is_pinned": True},
+        {"run_id": "r2", "status": "WARN", "is_pinned": True},
+        {"run_id": "r3", "status": "WARN", "is_pinned": False},
+        {"run_id": "r4", "status": "FAIL", "is_pinned": True}
+    ]
+    file_path = tmp_path / "frozen_runs_sample.json"
+    with file_path.open("w", encoding="utf-8") as f:
+        json.dump(data, f)
+    return file_path, [core.FrozenRun(**item) for item in data]
+
+
+def test_load_frozen_runs_valid(sample_frozen_runs):
+    file_path, expected = sample_frozen_runs
+    loaded = core.load_frozen_runs(str(file_path))
+    assert isinstance(loaded, list)
+    assert all(isinstance(r, core.FrozenRun) for r in loaded)
+    assert len(loaded) == len(expected)
+    assert loaded[1].status == "WARN"
+
+
+def test_calculate_warn_rate(sample_frozen_runs):
+    _, runs = sample_frozen_runs
+    warn_count, total = core.calculate_warn_rate(runs, threshold=0.5)
+    assert warn_count == 2
+    assert total == 4
+    ratio = warn_count / total
+    assert pytest.approx(ratio, 0.01) == 0.5
+
+
+def test_generate_report_ok():
+    report = core.generate_report(warn_count=1, total_runs=10, threshold=0.3)
+    assert isinstance(report, dict)
+    assert set(report.keys()) == {"warn_rate", "threshold", "status"}
+    assert report["status"] == "OK"
+    assert report["warn_rate"] == pytest.approx(0.1, 0.001)
+
+
+def test_generate_report_warn():
+    report = core.generate_report(warn_count=4, total_runs=10, threshold=0.3)
+    assert report["status"] == "WARN"
+    assert report["warn_rate"] == pytest.approx(0.4, 0.001)
+
+
+def test_input_file_validation(tmp_path):
+    invalid_path = tmp_path / "missing.json"
+    with pytest.raises(FileNotFoundError):
+        core.load_frozen_runs(str(invalid_path))
+
+
+def test_invalid_data_structure(tmp_path):
+    malformed_path = tmp_path / "bad.json"
+    with malformed_path.open("w", encoding="utf-8") as f:
+        json.dump({"run_id": "r1", "status": "WARN"}, f)
+    with pytest.raises(ValueError):
+        core.load_frozen_runs(str(malformed_path))
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