text: // Copyright (C) 2022 Igalia, S.L. All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  
  /*---
  esid: sec-temporal.duration.prototype.subtract
  description: Leap second is a valid ISO string for TimeZone
  features: [Temporal]
  ---*/
  
  const instance = new Temporal.Duration(1);
  let timeZone = "2016-12-31T23:59:60+00:00[UTC]";
  
  // A string with a leap second is a valid ISO string, so the following two
  // operations should not throw
  
  instance.subtract(new Temporal.Duration(1), { relativeTo: { year: 2000, month: 5, day: 2, timeZone } });
  instance.subtract(new Temporal.Duration(1), { relativeTo: { year: 2000, month: 5, day: 2, timeZone: { timeZone } } });
  
  timeZone = "2021-08-19T17:30:45.123456789+23:59[+23:59:60]";
  assert.throws(RangeError, () => instance.subtract(new Temporal.Duration(1), { relativeTo: { year: 2000, month: 5, day: 2, timeZone } }), "leap second in time zone name not valid");
  assert.throws(RangeError, () => instance.subtract(new Temporal.Duration(1), { relativeTo: { year: 2000, month: 5, day: 2, timeZone: { timeZone } } }), "leap second in time zone name not valid (nested property)");
  