feat: sun UTC-to-local conversion and cache

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/test_sun.py b/tests/test_sun.py
new file mode 100644
index 0000000..2a64632
--- /dev/null
+++ b/tests/test_sun.py
@@ -0,0 +1,21 @@
+import json
+from datetime import timezone
+from zoneinfo import ZoneInfo
+from hyprsunset_qt.sun import to_local_hm, read_cache, write_cache
+
+
+def test_utc_to_local_hm():
+    # 2026-07-17T17:40:00+00:00 -> 19:40 in Europe/Rome (UTC+2 summer)
+    tz = ZoneInfo("Europe/Rome")
+    assert to_local_hm("2026-07-17T17:40:00+00:00", tz) == "19:40"
+
+
+def test_cache_roundtrip(tmp_path):
+    path = tmp_path / "sun.json"
+    payload = {"lat": "45.07", "lon": "7.68", "results": {"sunset": "x"}}
+    write_cache(payload, path)
+    assert read_cache(path) == payload
+
+
+def test_read_cache_missing(tmp_path):
+    assert read_cache(tmp_path / "nope.json") is None