v8/test/webkit/fast/js/number-toprecision.js

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// Copyright 2013 the V8 project authors. All rights reserved.
// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
description(
'This test checks a few Number.toPrecision cases, including ' +
'<a href="http://bugs.webkit.org/show_bug.cgi?id=15145">15145: (0.999).toPrecision(1) returns incorrect result</a>' +
'.');
shouldBeEqualToString("(0.999).toPrecision(1)", "1");
shouldBeEqualToString("(0.999).toPrecision(2)", "1.0");
shouldBeEqualToString("(0.999).toPrecision(3)", "0.999");
var posInf = 1/0;
var negInf = -1/0;
var nan = 0/0;
shouldBeEqualToString("(0.0).toPrecision(4)", "0.000");
shouldBeEqualToString("(-0.0).toPrecision(4)", "0.000");
shouldBeEqualToString("(0.0).toPrecision()", "0");
shouldBeEqualToString("(-0.0).toPrecision()", "0");
shouldBeEqualToString("(1234.567).toPrecision()", "1234.567");
shouldThrow("(1234.567).toPrecision(0)");
shouldThrow("(1234.567).toPrecision(null)"); // just like 0
shouldThrow("(1234.567).toPrecision(false)"); // just like 0
shouldThrow("(1234.567).toPrecision('foo')"); // just like 0
shouldThrow("(1234.567).toPrecision(-1)");
shouldBeEqualToString("(1234.567).toPrecision(1)", "1e+3");
shouldBeEqualToString("(1234.567).toPrecision(true)", "1e+3"); // just like 1
shouldBeEqualToString("(1234.567).toPrecision('1')", "1e+3"); // just like 1
shouldBeEqualToString("(1234.567).toPrecision(2)", "1.2e+3");
shouldBeEqualToString("(1234.567).toPrecision(2.9)", "1.2e+3");
shouldBeEqualToString("(1234.567).toPrecision(5)", "1234.6");
shouldBeEqualToString("(1234.567).toPrecision(21)", "1234.56700000000000728");
// SpiderMonkey allows precision values 1 to 100, we implement the spec and only allow 1 to 21.
shouldThrow("(1234.567).toPrecision(22)");
shouldThrow("(1234.567).toPrecision(100)");
shouldThrow("(1234.567).toPrecision(101)");
shouldThrow("(1234.567).toPrecision(posInf)");
shouldThrow("(1234.567).toPrecision(negInf)");
shouldThrow("(1234.567).toPrecision(nan)"); // nan is treated like 0
shouldBeEqualToString("posInf.toPrecision()", "Infinity");
shouldBeEqualToString("negInf.toPrecision()", "-Infinity");
shouldBeEqualToString("nan.toPrecision()", "NaN");