fix: restore Hong Kong CoWIN reference curve

tests/test_cowin_sources.py

@@ -0,0 +1,87 @@
+import threading
+from datetime import datetime, timezone
+
+import httpx
+
+from src.data_collection import cowin_sources
+from src.data_collection.cowin_sources import CowinSourceMixin
+
+
+class _FakeResponse:
+    content = b"{}"
+
+    def __init__(self, payload):
+        self._payload = payload
+        self.text = "{}"
+
+    def json(self):
+        return self._payload
+
+    def raise_for_status(self):
+        return None
+
+
+class _FakeCowinCollector(CowinSourceMixin):
+    timeout = 2
+    cowin_obs_cache_ttl_sec = 0
+    _cowin_obs_cache = {}
+    _cowin_obs_cache_lock = threading.Lock()
+    user_agent = "test"
+
+    def _http_get(self, url):
+        raise httpx.ConnectError("[SSL: CERTIFICATE_VERIFY_FAILED] unable to get local issuer certificate")
+
+
+def test_cowin_current_retries_without_tls_verification_when_chain_is_incomplete(monkeypatch):
+    calls = []
+
+    def fake_get(url, **kwargs):
+        calls.append({"url": url, **kwargs})
+        return _FakeResponse(
+            {
+                "station": 6087,
+                "minutely": [
+                    {"obstime": "2026-05-28T07:59:00", "value1": 30.1},
+                    {"obstime": "2026-05-28T08:00:00", "value1": 30.0},
+                ],
+            }
+        )
+
+    monkeypatch.setattr(cowin_sources.requests, "get", fake_get)
+
+    current = _FakeCowinCollector().fetch_cowin_obs_current("hong kong")
+
+    assert current is not None
+    assert current["station_code"] == "6087"
+    assert current["current"]["temp"] == 30.0
+    assert current["obs_time"] == "2026-05-28T08:00:00+08:00"
+    assert calls
+    assert calls[0]["verify"] is False
+
+
+def test_cowin_today_series_returns_hong_kong_local_intraday_points(monkeypatch):
+    def fake_get(url, **kwargs):
+        return _FakeResponse(
+            {
+                "station": 6087,
+                "minutely": [
+                    {"obstime": "2026-05-27T23:59:00", "value1": 29.8},
+                    {"obstime": "2026-05-28T00:00:00", "value1": 29.9},
+                    {"obstime": "2026-05-28T07:58:00", "value1": 30.1},
+                    {"obstime": "2026-05-28T08:00:00", "value1": 30.0},
+                ],
+            }
+        )
+
+    monkeypatch.setattr(cowin_sources.requests, "get", fake_get)
+
+    points = _FakeCowinCollector().fetch_cowin_obs_today_series(
+        "hong kong",
+        now_utc=datetime(2026, 5, 28, 0, 5, tzinfo=timezone.utc),
+    )
+
+    assert points == [
+        {"time": "00:00", "temp": 29.9},
+        {"time": "07:58", "temp": 30.1},
+        {"time": "08:00", "temp": 30.0},
+    ]