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deps/v8/test/mjsunit/temporal/instant-from-epoch-milliseconds.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 bigint_nano = 567890123456789000000n;
+let milli = 567890123456789;
+let bigint_milli = BigInt(milli);
+let inst1 = new Temporal.Instant(bigint_nano);
+assertThrows(() =>
+    Temporal.Instant.fromEpochMilliseconds(bigint_milli),
+    TypeError);
+let inst2 = Temporal.Instant.fromEpochMilliseconds(milli);
+assertEquals(inst1, inst2);
+
+let just_fit_neg = -8640000000000000;
+let just_fit_pos = 8640000000000000;
+let too_big = 8640000000000001;
+let too_small = -8640000000000001;
+
+assertThrows(() =>
+    Temporal.Instant.fromEpochMilliseconds(too_small),
+    RangeError);
+assertThrows(() =>
+    Temporal.Instant.fromEpochMilliseconds(too_big),
+    RangeError);
+assertEquals(just_fit_neg,
+    (Temporal.Instant.fromEpochMilliseconds(
+        just_fit_neg)).epochMilliseconds);
+assertEquals(just_fit_pos,
+    (Temporal.Instant.fromEpochMilliseconds(
+        just_fit_pos)).epochMilliseconds);