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Edit File: error-tostring.js
// Copyright 2011 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * 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. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT // OWNER OR 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. // Test default string representation of an Error object. var e = new Error(); assertEquals('Error', e.toString()); // Test printing of cyclic errors which return the empty string for // compatibility with Safari and Firefox. e = new Error(); e.name = e; e.message = e; e.stack = "Does not occur in output"; e.arguments = "Does not occur in output"; e.type = "Does not occur in output"; assertEquals('', e.toString()); e = new Error(); e.name = [ e ]; e.message = [ e ]; e.stack = "Does not occur in output"; e.arguments = "Does not occur in output"; e.type = "Does not occur in output"; assertEquals('', e.toString()); // Test the sequence in which getters and toString operations are called // on a given Error object. Verify the produced string representation. function testErrorToString(nameValue, messageValue) { var seq = []; var e = { get name() { seq.push(1); return (nameValue === undefined) ? nameValue : { toString: function() { seq.push(2); return nameValue; } }; }, get message() { seq.push(3); return (messageValue === undefined) ? messageValue : { toString: function() { seq.push(4); return messageValue; } }; } }; var string = Error.prototype.toString.call(e); return [string,seq]; } assertEquals(["Error",[1,3]], testErrorToString(undefined, undefined)); assertEquals(["e1",[1,2,3]], testErrorToString("e1", undefined)); assertEquals(["e1: null",[1,2,3,4]], testErrorToString("e1", null)); assertEquals(["e1",[1,2,3,4]], testErrorToString("e1", "")); assertEquals(["Error: e2",[1,3,4]], testErrorToString(undefined, "e2")); assertEquals(["null: e2",[1,2,3,4]], testErrorToString(null, "e2")); assertEquals(["e2",[1,2,3,4]], testErrorToString("", "e2")); assertEquals(["e1: e2",[1,2,3,4]], testErrorToString("e1", "e2"));