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deps/v8/test/mjsunit/temporal/instant-from-epoch-nanoseconds.js

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+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// Flags: --harmony-temporal
+
+let bigint1 = 1234567890123456789n;
+let inst1 = new Temporal.Instant(bigint1);
+let inst2 = Temporal.Instant.fromEpochNanoseconds(bigint1);
+assertEquals(inst1, inst2);
+
+let just_fit_neg_bigint = -8640000000000000000000n;
+let just_fit_pos_bigint = 8640000000000000000000n;
+let too_big_bigint = 8640000000000000000001n;
+let too_small_bigint = -8640000000000000000001n;
+
+assertThrows(() =>
+    {let inst = Temporal.Instant.fromEpochNanoseconds(too_small_bigint)},
+    RangeError);
+assertThrows(() =>
+    {let inst = Temporal.Instant.fromEpochNanoseconds(too_big_bigint)},
+    RangeError);
+assertEquals(just_fit_neg_bigint,
+    (Temporal.Instant.fromEpochNanoseconds(
+        just_fit_neg_bigint)).epochNanoseconds);
+assertEquals(just_fit_pos_bigint,
+    (Temporal.Instant.fromEpochNanoseconds(
+        just_fit_pos_bigint)).epochNanoseconds);