feat: add detection + forecast modules with tests

tests/test_detection.py

@@ -0,0 +1,79 @@
+"""detection 模块测试（mock TDengine execute 返回预设窗口）。"""
+
+from unittest.mock import MagicMock
+import pytest
+from ts_anomaly_td.detection import run_anomaly_window, detect_all_algos, ALL_ALGOS
+
+
+def make_mock_conn(rows=None):
+    """构造 mock TDConnection，execute 返回预设行。"""
+    conn = MagicMock()
+    conn.execute.return_value = rows or []
+    return conn
+
+
+def test_run_anomaly_window_returns_windows():
+    """正常返回两个异常窗口。"""
+    conn = make_mock_conn([
+        (1000000, 2000000),
+        (3000000, 4000000),
+    ])
+    windows = run_anomaly_window(conn, "finance_001", "ksigma")
+    assert windows == [(1000000, 2000000), (3000000, 4000000)]
+
+
+def test_run_anomaly_window_empty():
+    """无异常窗口时返回空列表。"""
+    conn = make_mock_conn([])
+    windows = run_anomaly_window(conn, "finance_001", "iqr")
+    assert windows == []
+
+
+def test_run_anomaly_window_invalid_algo():
+    """不支持的算法抛 ValueError。"""
+    conn = make_mock_conn()
+    with pytest.raises(ValueError, match="不支持的算法"):
+        run_anomaly_window(conn, "test", "nonexistent")
+
+
+def test_run_anomaly_window_sql_error():
+    """SQL 执行失败传播异常。"""
+    conn = make_mock_conn()
+    conn.execute.side_effect = Exception("TDengine error")
+
+    with pytest.raises(Exception, match="TDengine error"):
+        run_anomaly_window(conn, "test", "ksigma")
+
+
+def test_detect_all_algos_independent_fault_tolerance():
+    """单个算法失败不影响其他算法。"""
+    conn = MagicMock()
+
+    def side_effect(sql):
+        if "iqr" in sql:
+            raise Exception("iqr failed")
+        return [(1000, 2000)]
+
+    conn.execute.side_effect = side_effect
+
+    results = detect_all_algos(conn, "test")
+
+    # 所有 6 个算法都在结果中
+    assert set(results.keys()) == set(ALL_ALGOS)
+
+    # iqr 记录了 error
+    assert results["iqr"]["error"] == "iqr failed"
+    assert results["iqr"]["windows"] == []
+
+    # 其他算法正常
+    for algo in ALL_ALGOS:
+        if algo != "iqr":
+            assert results[algo]["error"] is None
+            assert len(results[algo]["windows"]) == 1
+
+
+def test_detect_all_algos_custom_algo_list():
+    """指定算法子集。"""
+    conn = make_mock_conn([(1000, 2000)])
+    results = detect_all_algos(conn, "test", algos=["ksigma", "iqr"])
+    assert set(results.keys()) == {"ksigma", "iqr"}