bugfix wunderground reporting

internal/mqttingest/latest_test.go

@@ -0,0 +1,50 @@
+package mqttingest
+
+import (
+	"testing"
+	"time"
+)
+
+func TestLatestDailyRainUsesConfiguredTimezone(t *testing.T) {
+	loc, err := time.LoadLocation("Australia/Sydney")
+	if err != nil {
+		t.Fatalf("load location: %v", err)
+	}
+
+	l := NewLatest(loc)
+
+	// Crosses UTC midnight but remains the same local day in Sydney (UTC+11 during DST).
+	l.Update(time.Date(2026, time.January, 14, 22, 0, 0, 0, time.UTC), &WS90Payload{RainMM: 0})
+	l.Update(time.Date(2026, time.January, 14, 23, 30, 0, 0, time.UTC), &WS90Payload{RainMM: 2})
+	l.Update(time.Date(2026, time.January, 15, 0, 5, 0, 0, time.UTC), &WS90Payload{RainMM: 2})
+
+	snap, ok := l.Snapshot()
+	if !ok {
+		t.Fatal("expected snapshot")
+	}
+	if snap.DailyRainMM != 2 {
+		t.Fatalf("expected daily rain 2.0mm, got %.2fmm", snap.DailyRainMM)
+	}
+}
+
+func TestLatestDailyRainResetsAtConfiguredLocalMidnight(t *testing.T) {
+	loc, err := time.LoadLocation("Australia/Sydney")
+	if err != nil {
+		t.Fatalf("load location: %v", err)
+	}
+
+	l := NewLatest(loc)
+
+	// Crosses local midnight in Sydney (00:00 local == 13:00 UTC during DST).
+	l.Update(time.Date(2026, time.January, 15, 12, 30, 0, 0, time.UTC), &WS90Payload{RainMM: 0})
+	l.Update(time.Date(2026, time.January, 15, 12, 50, 0, 0, time.UTC), &WS90Payload{RainMM: 1})
+	l.Update(time.Date(2026, time.January, 15, 13, 10, 0, 0, time.UTC), &WS90Payload{RainMM: 1})
+
+	snap, ok := l.Snapshot()
+	if !ok {
+		t.Fatal("expected snapshot")
+	}
+	if snap.DailyRainMM != 0 {
+		t.Fatalf("expected daily rain reset after local midnight; got %.2fmm", snap.DailyRainMM)
+	}
+}