Lasse Reichstein Holst Nielsen
a81bc639b5
Add test. Change-Id: I385f7237e1b3d004b4401e18a82919b15d097181 Reviewed-on: https://dart-review.googlesource.com/46460 Commit-Queue: Lasse R.H. Nielsen <lrn@google.com> Reviewed-by: Florian Loitsch <floitsch@google.com>
68 lines
1.6 KiB
Dart
68 lines
1.6 KiB
Dart
// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import "package:expect/expect.dart";
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import 'dart:math' show pow;
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main() {
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// Test integers.
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testInt(0);
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for (int i = 0; i < 63; i++) {
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var n = pow(2, i);
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testInt(-n - 1);
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testInt(-n);
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testInt(-n + 1);
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testInt(n - 1);
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testInt(n);
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testInt(n + 1);
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}
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testInt(-0x8000000000000000);
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// Test doubles.
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testDouble(0.0);
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testDouble(-0.0, 0.0);
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for (double d in [
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1.0,
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2.0,
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pow(2.0, 30) - 1,
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pow(2.0, 30),
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pow(2.0, 31) - 1,
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pow(2.0, 31),
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pow(2.0, 31) + 1,
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pow(2.0, 32) - 1,
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pow(2.0, 32),
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pow(2.0, 32) + 1,
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pow(2.0, 52) - 1,
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pow(2.0, 52),
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pow(2.0, 52) + 1,
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pow(2.0, 53) - 1,
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pow(2.0, 53),
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]) {
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for (int p = 0; p < 1024; p++) {
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var value = d * pow(2.0, p); // Valid integer value.
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if (!value.isFinite) break;
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testDouble(-value);
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testDouble(value);
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}
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}
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Expect.equals(BigInt.zero, new BigInt.from(0.5));
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Expect.equals(BigInt.one, new BigInt.from(1.5));
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Expect.throws(() => new BigInt.from(double.infinity));
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Expect.throws(() => new BigInt.from(-double.infinity));
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Expect.throws(() => new BigInt.from(double.nan));
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}
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testInt(int n) {
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var bigint = new BigInt.from(n);
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Expect.equals(n, bigint.toInt());
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Expect.equals("$n", "$bigint");
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}
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testDouble(double input, [double expectation]) {
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var bigint = new BigInt.from(input);
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Expect.equals(expectation ?? input, bigint.toDouble());
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}
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