small fix, don't worry about it

app/backend/internal/database/redis_test.go

@@ -0,0 +1,23 @@
+package database
+
+import "testing"
+
+func TestNewRedisRejectsEmptyURL(t *testing.T) {
+	if _, err := NewRedis(""); err == nil {
+		t.Fatal("expected error for empty redis URL")
+	}
+}
+
+func TestNewRedisRejectsInvalidURL(t *testing.T) {
+	if _, err := NewRedis("://bad-redis-url"); err == nil {
+		t.Fatal("expected error for invalid redis URL")
+	}
+}
+
+func TestNewRedisAcceptsValidURL(t *testing.T) {
+	r, err := NewRedis("redis://:password@localhost:6379/0")
+	if err != nil {
+		t.Fatalf("expected valid redis URL, got error: %v", err)
+	}
+	_ = r.Close()
+}