Test that DateTime.later() will preserve $.timezone

Author: Chris Jepeway

S32-temporal/DateTime.t

@@ -1,7 +1,7 @@
 use v6;
 use Test;
 
-plan 219;
+plan 220;
 
 my $orwell = DateTime.new(year => 1984);
 
@@ -596,6 +596,13 @@ is DateTime.now.Date, Date.today, 'coercion to Date';
        'subtracting 3 weeks, overflowing to years';
 }
 
+# check that timezones are preserved
+{
+    is +DateTime.new(0, :timezone(1)).later(seconds => 1).timezone,
+       1,
+       '.later preserves timezone';
+}
+
 # RT #121990 Smartmatch against a Date 
 {
     my $now = DateTime.now;