feat: add render-algo subcommand for single-algorithm GT+detection PNG

tests/test_render_algo.py

@@ -0,0 +1,37 @@
+"""render_algo 单元测试。"""
+
+import json
+import tempfile
+from pathlib import Path
+
+from ts_anomaly_td.visualize import render_algo
+
+
+def _make_ts_vals_labels(n=200):
+    """生成测试用时间序列。"""
+    ts = [i * 3600_000 for i in range(n)]  # 每小时
+    vals = [float(i % 20) for i in range(n)]
+    labels = [1 if 50 <= i <= 60 else 0 for i in range(n)]
+    return ts, vals, labels
+
+
+def test_render_algo_basic():
+    """render_algo 应生成有效 PNG。"""
+    ts, vals, labels = _make_ts_vals_labels()
+    windows = [[ts[50], ts[60]]]
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        out = Path(tmpdir) / "test_algo.png"
+        result = render_algo(ts, vals, labels, windows, "ksigma", str(out), title="test")
+        assert Path(result).exists()
+        assert Path(result).stat().st_size > 5000
+
+
+def test_render_algo_empty_windows():
+    """空检测窗口应正常渲染。"""
+    ts, vals, labels = _make_ts_vals_labels(50)
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        out = Path(tmpdir) / "empty.png"
+        result = render_algo(ts, vals, labels, [], "iqr", str(out))
+        assert Path(result).exists()