1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/Temporal/TimeZone/prototype/getPreviousTransition/nanoseconds-subtracted-or-added-at-dst-transition.js b/js/src/tests/test262/intl402/Temporal/TimeZone/prototype/getPreviousTransition/nanoseconds-subtracted-or-added-at-dst-transition.js
new file mode 100644
index 0000000000..1e978d0936
--- /dev/null
+++ b/js/src/tests/test262/intl402/Temporal/TimeZone/prototype/getPreviousTransition/nanoseconds-subtracted-or-added-at-dst-transition.js
@@ -0,0 +1,27 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2022 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone.prototype.getprevioustransition
+description: >
+  Test previous transition when nanoseconds are subtracted resp. added to the DST transition.
+features: [Temporal]
+---*/
+
+let tz = new Temporal.TimeZone("Europe/Berlin");
+let p = Temporal.Instant.from("2021-03-28T01:00:00Z");
+
+assert.sameValue(tz.getPreviousTransition(p.add({nanoseconds: -1})).toString(),
+                 "2020-10-25T01:00:00Z",
+                 "DST transition minus one nanosecond");
+
+assert.sameValue(tz.getPreviousTransition(p).toString(),
+                 "2020-10-25T01:00:00Z",
+                 "DST transition");
+
+assert.sameValue(tz.getPreviousTransition(p.add({nanoseconds: +1})).toString(),
+                 "2021-03-28T01:00:00Z",
+                 "DST transition plus one nanosecond");
+
+reportCompare(0, 0);