feat: add watch subcommand (TMQ + polling fallback)

tests/test_tmq_watch.py

@@ -0,0 +1,55 @@
+"""tmq_watch 模块测试（mock TMQ consumer）。"""
+
+from unittest.mock import MagicMock, patch
+import pytest
+from ts_anomaly_td.tmq_watch import WatchRunner
+
+
+def make_mock_conn():
+    conn = MagicMock()
+    conn.execute.return_value = [(1000, 1.0), (2000, 2.0)]
+    return conn
+
+
+def test_watch_runner_polling_fallback(monkeypatch):
+    """TMQ 不可用时自动降级为轮询。"""
+    conn = make_mock_conn()
+    runner = WatchRunner(conn, "test", window_sec=0.1)
+
+    # 强制 TMQ 不可用
+    runner._run_tmq = MagicMock(side_effect=ImportError("no TMQ"))
+
+    # 跑一个轮询周期就停
+    poll_count = [0]
+
+    def mock_poll():
+        poll_count[0] += 1
+        runner._mode = "polling"
+        runner.stop()
+
+    runner._run_polling = mock_poll
+
+    runner.run()
+    assert runner._mode == "polling"
+    assert poll_count[0] == 1
+
+
+def test_watch_runner_stop_on_signal():
+    """收到 stop 后退出循环。"""
+    conn = make_mock_conn()
+    runner = WatchRunner(conn, "test", window_sec=0.1)
+    runner.stop()
+    assert runner._stop is True
+
+
+def test_watch_runner_window_check():
+    """_check_window 调用 detection。"""
+    conn = make_mock_conn()
+    runner = WatchRunner(conn, "test")
+
+    with patch("ts_anomaly_td.detection.detect_all_algos") as mock_det:
+        mock_det.return_value = {
+            "ksigma": {"windows": [(1000, 2000)], "error": None},
+        }
+        runner._check_window([(1000, 1.0)])
+        mock_det.assert_called_once_with(conn, "test")