diff --git a/sync/service/recur.go b/sync/service/recur.go
index 14ca655..4b09c84 100644
--- a/sync/service/recur.go
+++ b/sync/service/recur.go
@@ -1,4 +1,4 @@
-package main
+package service
 
 import (
 	"log/slog"
diff --git a/sync/service/recur_test.go b/sync/service/recur_test.go
index edef11f..c1450c8 100644
--- a/sync/service/recur_test.go
+++ b/sync/service/recur_test.go
@@ -1,14 +1,65 @@
-package main
+package service
 
 import (
 	"log/slog"
 	"testing"
 	"time"
+
+	"go-mod.ewintr.nl/planner/item"
 )
 
 func TestRecur(t *testing.T) {
 	t.Parallel()
 
+	now := time.Date(2024, 1, 1, 10, 0, 0, 0, time.UTC)
 	mem := NewMemory()
 	rec := NewRecur(mem, mem, time.Second, slog.New())
+
+	// Create a recurring item
+	recur := &item.Recur{
+		Start:  now,
+		Period: item.PeriodDay,
+		Count:  1,
+	}
+	testItem := item.Item{
+		ID:        "test-1",
+		Kind:      item.KindEvent,
+		Updated:   now,
+		Deleted:   false,
+		Recurrer:  recur,
+		RecurNext: now,
+		Body:      `{"title":"Test Event","start":"2024-01-01T10:00:00Z","duration":30}`,
+	}
+
+	// Store the item
+	if err := mem.Update(testItem); err != nil {
+		t.Fatalf("failed to store test item: %v", err)
+	}
+
+	// Run recurrence
+	if err := rec.Recur(); err != nil {
+		t.Fatalf("Recur failed: %v", err)
+	}
+
+	// Verify results
+	items, err := mem.Updated([]item.Kind{item.KindEvent}, now)
+	if err != nil {
+		t.Fatalf("failed to get updated items: %v", err)
+	}
+
+	if len(items) != 2 { // Original + new instance
+		t.Errorf("expected 2 items, got %d", len(items))
+	}
+
+	// Check that RecurNext was updated
+	recurItems, err := mem.RecursBefore(now.Add(48 * time.Hour))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(recurItems) != 1 {
+		t.Errorf("expected 1 recur item, got %d", len(recurItems))
+	}
+	if !recurItems[0].RecurNext.After(now) {
+		t.Errorf("RecurNext was not updated, still %v", recurItems[0].RecurNext)
+	}
 }