added getting data from nightscout

tests/test_nightscout_client.py

@@ -0,0 +1,98 @@
+from datetime import datetime, timedelta, timezone
+
+import pytest
+
+import nightscout_client as ns
+
+
+class FakeResponse:
+    def __init__(self, payload):
+        self._payload = payload
+
+    def raise_for_status(self):
+        pass
+
+    def json(self):
+        return self._payload
+
+
+def test_mgdl_to_mmol_converts_correctly():
+    assert ns.mgdl_to_mmol(126.0) == pytest.approx(7.0, abs=0.05)
+
+
+def test_base_url_requires_nightscout_url(monkeypatch):
+    monkeypatch.delenv("NIGHTSCOUT_URL", raising=False)
+    with pytest.raises(ns.NightscoutConfigError):
+        ns._base_url()
+
+
+def test_base_url_strips_trailing_slash(monkeypatch):
+    monkeypatch.setenv("NIGHTSCOUT_URL", "https://example.com/")
+    assert ns._base_url() == "https://example.com"
+
+
+def test_auth_prefers_token_over_api_secret(monkeypatch):
+    monkeypatch.setenv("NIGHTSCOUT_TOKEN", "my-token")
+    monkeypatch.setenv("NIGHTSCOUT_API_SECRET", "my-secret")
+    headers, params = ns._auth()
+    assert params == {"token": "my-token"}
+    assert headers == {}
+
+
+def test_auth_hashes_api_secret(monkeypatch):
+    monkeypatch.delenv("NIGHTSCOUT_TOKEN", raising=False)
+    monkeypatch.setenv("NIGHTSCOUT_API_SECRET", "my-secret")
+    headers, params = ns._auth()
+    assert params == {}
+    assert headers["API-SECRET"] != "my-secret"  # nooit in plaintext
+    assert len(headers["API-SECRET"]) == 40  # sha1 hexdigest
+
+
+def test_fetch_entries_converts_and_filters_by_time(monkeypatch):
+    monkeypatch.setenv("NIGHTSCOUT_URL", "https://example.com")
+    monkeypatch.delenv("NIGHTSCOUT_TOKEN", raising=False)
+    monkeypatch.delenv("NIGHTSCOUT_API_SECRET", raising=False)
+
+    now = datetime.now(timezone.utc)
+    recent = now - timedelta(hours=1)
+    too_old = now - timedelta(hours=48)
+    payload = [
+        {"date": int(recent.timestamp() * 1000), "sgv": 126},
+        {"date": int(too_old.timestamp() * 1000), "sgv": 90},
+    ]
+
+    monkeypatch.setattr(ns.requests, "get", lambda *a, **k: FakeResponse(payload))
+
+    result = ns.fetch_entries(hours=24)
+    assert len(result) == 1
+    assert result.iloc[0]["mmol"] == pytest.approx(7.0, abs=0.05)
+
+
+def test_fetch_entries_handles_empty_response(monkeypatch):
+    monkeypatch.setenv("NIGHTSCOUT_URL", "https://example.com")
+    monkeypatch.setattr(ns.requests, "get", lambda *a, **k: FakeResponse([]))
+
+    result = ns.fetch_entries(hours=24)
+    assert result.empty
+    assert list(result.columns) == ["timestamp", "mmol"]
+
+
+def test_fetch_treatments_fills_missing_columns(monkeypatch):
+    monkeypatch.setenv("NIGHTSCOUT_URL", "https://example.com")
+    now = datetime.now(timezone.utc)
+    payload = [
+        {"created_at": now.isoformat(), "eventType": "Site Change"},
+    ]
+    monkeypatch.setattr(ns.requests, "get", lambda *a, **k: FakeResponse(payload))
+
+    result = ns.fetch_treatments(hours=24)
+    assert len(result) == 1
+    assert result.iloc[0]["eventType"] == "Site Change"
+    assert pd_isna(result.iloc[0]["insulin"])
+    assert pd_isna(result.iloc[0]["carbs"])
+
+
+def pd_isna(value):
+    import pandas as pd
+
+    return pd.isna(value)