From cb2dac40bc7b86df8aa97de53b8d7e39b29fbb18 Mon Sep 17 00:00:00 2001
From: Xotic750 <xotic750@gmail>
Date: Wed, 18 Nov 2015 02:56:41 +0100
Subject: [PATCH] Tests for `JSON#parse` and `JSON#stringify`.
 https://github.com/es-shims/es5-shim/issues/258

Ported the latest JSON3 test suite.
---
 tests/index.html     |   2 +-
 tests/native.html    |   2 +-
 tests/spec/s-json.js | 531 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 533 insertions(+), 2 deletions(-)
 create mode 100644 tests/spec/s-json.js

diff --git a/tests/index.html b/tests/index.html
index efbe63a2..43347dba 100644
--- a/tests/index.html
+++ b/tests/index.html
@@ -27,7 +27,7 @@
 	<script src="spec/s-number.js"></script>
 	<script src="spec/s-object.js"></script>
 	<script src="spec/s-string.js"></script>
-
+	<script src="spec/s-json.js"></script>
 
 	<script type="text/javascript">
 		(function() {
diff --git a/tests/native.html b/tests/native.html
index 241b61b7..b0c31c1d 100644
--- a/tests/native.html
+++ b/tests/native.html
@@ -23,7 +23,7 @@
 	<script src="spec/s-number.js"></script>
 	<script src="spec/s-object.js"></script>
 	<script src="spec/s-string.js"></script>
-
+	<script src="spec/s-json.js"></script>
 
 	<script type="text/javascript">
 		(function() {
diff --git a/tests/spec/s-json.js b/tests/spec/s-json.js
new file mode 100644
index 00000000..2cef0f49
--- /dev/null
+++ b/tests/spec/s-json.js
@@ -0,0 +1,531 @@
+/* global describe, it, expect */
+
+/* Ported from JSON 3 Unit Test Suite | https://bestiejs.github.io/json3 */
+describe('JSON', function () {
+  // Ensures that `JSON.parse` throws an exception when parsing the given
+  // `source` string.
+  var parseError = function (source, message, callback) {
+    try {
+      expect(JSON.parse(source, callback)).toThrow();
+    } catch (e) {
+      expect(e instanceof SyntaxError).toBe(true);
+    }
+  };
+  // Ensures that `JSON.parse` parses the given source string correctly.
+  var parses = function (expected, source, message, callback) {
+    expect(JSON.parse(source, callback)).toEqual(expected);
+  };
+  // Ensures that `JSON.stringify` serializes the given object correctly.
+  var serializes = function (expected, value, message, filter, width) {
+    expect(JSON.stringify(value, filter, width)).toBe(expected);
+  };
+  // Ensures that `JSON.stringify` throws a `TypeError` if the given object
+  // contains a circular reference.
+  var cyclicError = function (value) {
+    try {
+      expect(JSON.stringify(value)).toThrow();
+    } catch (e) {
+      expect(e instanceof TypeError).toBe(true);
+    }
+  };
+  // Tests
+  // -----
+  it('`parse`: Empty Source Strings', function () {
+    parseError('', 'Empty JSON source string');
+    parseError('\n\n\r\n', 'Source string containing only line terminators');
+    parseError(' ', 'Source string containing a single space character');
+    parseError(' ', 'Source string containing multiple space characters');
+  });
+  it('`parse`: Whitespace', function () {
+    // The only valid JSON whitespace characters are tabs, spaces, and line
+    // terminators. All other Unicode category `Z` (`Zs`, `Zl`, and `Zp`)
+    // characters are invalid (note that the `Zs` category includes the
+    // space character).
+    var characters = [
+        '{\u00a0}',
+        '{\u1680}',
+        '{\u180e}',
+        '{\u2000}',
+        '{\u2001}',
+        '{\u2002}',
+        '{\u2003}',
+        '{\u2004}',
+        '{\u2005}',
+        '{\u2006}',
+        '{\u2007}',
+        '{\u2008}',
+        '{\u2009}',
+        '{\u200a}',
+        '{\u202f}',
+        '{\u205f}',
+        '{\u3000}',
+        '{\u2028}',
+        '{\u2029}'
+    ];
+    characters.forEach(function (value) {
+      parseError(value, 'Source string containing an invalid Unicode whitespace character');
+    });
+    parseError('{\u000b}', 'Source string containing a vertical tab');
+    parseError('{\u000c}', 'Source string containing a form feed');
+    parseError('{\ufeff}', 'Source string containing a byte-order mark');
+    parses({}, '{\r\n}', 'Source string containing a CRLF line ending');
+    parses({}, '{\n\n\r\n}', 'Source string containing multiple line terminators');
+    parses({}, '{\t}', 'Source string containing a tab character');
+    parses({}, '{ }', 'Source string containing a space character');
+  });
+  it('`parse`: Octal Values', function () {
+    // `08` and `018` are invalid octal values.
+    var octal = ['00', '01', '02', '03', '04', '05', '06', '07', '010', '011', '08', '018'];
+    octal.forEach(function (value) {
+      parseError(value, 'Octal literal');
+      parseError('-' + value, 'Negative octal literal');
+      parseError('"\\' + value + '"', 'Octal escape sequence in a string');
+      parseError('"\\x' + value + '"', 'Hex escape sequence in a string');
+    });
+  });
+  it('`parse`: Numeric Literals', function () {
+    parses(100, '100', 'Integer');
+    parses(-100, '-100', 'Negative integer');
+    parses(10.5, '10.5', 'Float');
+    parses(-3.141, '-3.141', 'Negative float');
+    parses(0.625, '0.625', 'Decimal');
+    parses(-0.03125, '-0.03125', 'Negative decimal');
+    parses(1000, '1e3', 'Exponential');
+    parses(100, '1e+2', 'Positive exponential');
+    parses(-0.01, '-1e-2', 'Negative exponential');
+    parses(3125, '0.03125e+5', 'Decimalized exponential');
+    parses(100, '1E2', 'Case-insensitive exponential delimiter');
+    parseError('+1', 'Leading `+`');
+    parseError('1.', 'Trailing decimal point');
+    parseError('.1', 'Leading decimal point');
+    parseError('1e', 'Missing exponent');
+    parseError('1e-', 'Missing signed exponent');
+    parseError('--1', 'Leading `--`');
+    parseError('1-+', 'Trailing `-+`');
+    parseError('0xaf', 'Hex literal');
+    // The native `JSON.parse` implementation in IE 9 allows this syntax, but
+    // the feature tests should detect the broken implementation.
+    parseError('- 5', 'Invalid negative sign');
+  });
+  it('`parse`: String Literals', function () {
+    var expected = 48;
+    var controlCharacters = [
+      '\u0001',
+      '\u0002',
+      '\u0003',
+      '\u0004',
+      '\u0005',
+      '\u0006',
+      '\u0007',
+      '\b',
+      '\t',
+      '\n',
+      '\u000b',
+      '\f',
+      '\r',
+      '\u000e',
+      '\u000f',
+      '\u0010',
+      '\u0011',
+      '\u0012',
+      '\u0013',
+      '\u0014',
+      '\u0015',
+      '\u0016',
+      '\u0017',
+      '\u0018',
+      '\u0019',
+      '\u001a',
+      '\u001b',
+      '\u001c',
+      '\u001d',
+      '\u001e',
+      '\u001f'
+    ];
+    // Opera 7 discards null characters in strings.
+    if ('\0'.length) {
+      expected += 1;
+      controlCharacters.push('\u0000');
+    }
+    parses('value', '"value"', 'Double-quoted string literal');
+    parses('', '""', 'Empty string literal');
+    parses('\u2028', '"\\u2028"', 'String containing an escaped Unicode line separator');
+    parses('\u2029', '"\\u2029"', 'String containing an escaped Unicode paragraph separator');
+    // ExtendScript doesn't handle surrogate pairs correctly; attempting to
+    // parse `"\ud834\udf06"` will throw an uncatchable error (issue #29).
+    parses('\ud834\udf06', '"\ud834\udf06"', 'String containing an unescaped Unicode surrogate pair');
+    parses('\u0001', '"\\u0001"', 'String containing an escaped ASCII control character');
+    parses('\b', '"\\b"', 'String containing an escaped backspace');
+    parses('\f', '"\\f"', 'String containing an escaped form feed');
+    parses('\n', '"\\n"', 'String containing an escaped line feed');
+    parses('\r', '"\\r"', 'String containing an escaped carriage return');
+    parses('\t', '"\\t"', 'String containing an escaped tab');
+    parses('hello/world', '"hello\\/world"', 'String containing an escaped solidus');
+    parses('hello\\world', '"hello\\\\world"', 'String containing an escaped reverse solidus');
+    parses('hello"world', '"hello\\"world"', 'String containing an escaped double-quote character');
+    parseError('\'hello\'', 'Single-quoted string literal');
+    parseError('"\\x61"', 'String containing a hex escape sequence');
+    parseError('"hello \r\n world"', 'String containing an unescaped CRLF line ending');
+    controlCharacters.forEach(function (value) {
+      parseError('"' + value + '"', 'String containing an unescaped ASCII control character');
+    });
+  });
+  it('`parse`: Array Literals', function () {
+    parseError('[1, 2, 3,]', 'Trailing comma in array literal');
+    parses([1, 2, [3, [4, 5]], 6, [true, false], [null], [[]]], '[1, 2, [3, [4, 5]], 6, [true, false], [null], [[]]]', 'Nested arrays');
+    parses([{}], '[{}]', 'Array containing empty object literal');
+    var expected = [
+      100,
+      true,
+      false,
+      null,
+      {
+        a: ['hello'],
+        b: ['world']
+      },
+      [0.01]
+    ];
+    parses(expected, '[1e2, true, false, null, {"a": ["hello"], "b": ["world"]}, [1e-2]]', 'Mixed array');
+  });
+  it('`parse`: Object Literals', function () {
+    parses({
+      hello: 'world'
+    }, '{"hello": "world"}', 'Object literal containing one member');
+    parses({
+      hello: 'world',
+      foo: ['bar', true],
+      fox: {
+        quick: true,
+        purple: false
+      }
+    }, '{"hello": "world", "foo": ["bar", true], "fox": {"quick": true, "purple": false}}', 'Object literal containing multiple members');
+    parseError('{key: 1}', 'Unquoted identifier used as a property name');
+    parseError('{false: 1}', '`false` used as a property name');
+    parseError('{true: 1}', '`true` used as a property name');
+    parseError('{null: 1}', '`null` used as a property name');
+    parseError('{\'key\': 1}', 'Single-quoted string used as a property name');
+    parseError('{1: 2, 3: 4}', 'Number used as a property name');
+    parseError('{"hello": "world", "foo": "bar",}', 'Trailing comma in object literal');
+  });
+  // JavaScript expressions should never be evaluated, as JSON 3 does not use
+  // `eval`.
+  it('`parse`: Invalid Expressions', function () {
+    var expressions = [
+      '1 + 1',
+      '1 * 2',
+      'var value = 123;',
+      '{});value = 123;({}',
+      'call()',
+      '1, 2, 3, "value"'
+    ];
+    expressions.forEach(function (expression) {
+      parseError(expression, 'Source string containing a JavaScript expression');
+    });
+  });
+  it('`stringify` and `parse`: Optional Arguments', function () {
+    parses({
+      a: 1,
+      b: 16
+    }, '{"a": 1, "b": "10000"}', 'Callback function provided', function (key, value) {
+      return typeof value === 'string' ? parseInt(value, 2) : value;
+    });
+    serializes('{\n  "bar": 456\n}', {
+      foo: 123,
+      bar: 456
+    }, 'Object; optional `filter` and `whitespace` arguments', ['bar'], 2);
+    // Test adapted from the Opera JSON test suite via Ken Snyder.
+    // See http://testsuites.opera.com/JSON/correctness/scripts/045.js
+    // The regular expression is necessary because the ExtendScript engine
+    // only approximates pi to 14 decimal places (ES 3 and ES 5 approximate
+    // pi to 15 places).
+    expect(/^\{"PI":3\.\d{14,15}\}$/.test(JSON.stringify(Math, ['PI'])), 'List of non-enumerable property names specified as the `filter` argument').toBe(true);
+    expect(JSON.parse('[1, 2, 3]', function (key, value) {
+      if (typeof value === 'object' && value) {
+        return value;
+      }
+    }).length, 'Issue #10: `walk` should not use `splice` when removing an array element').toBe(3);
+  });
+  it('`stringify`', function () {
+    var expected = 30;
+    // Special values.
+    serializes('null', null, '`null` is represented literally');
+    serializes('null', 1 / 0, '`Infinity` is serialized as `null`');
+    serializes('null', 0 / 0, '`NaN` is serialized as `null`');
+    serializes('null', -1 / 0, '`-Infinity` is serialized as `null`');
+    serializes('true', true, 'Boolean primitives are represented literally');
+    serializes('false', Object(false), 'Boolean objects are represented literally');
+    serializes('"\\\\\\"How\\bquickly\\tdaft\\njumping\\fzebras\\rvex\\""', Object('\\"How\bquickly\tdaft\njumping\fzebras\rvex"'), 'All control characters in strings are escaped');
+    serializes('[false,1,"Kit"]', [Object(false), Object(1), Object('Kit')], 'Arrays are serialized recursively');
+    serializes('[null]', [void 0], '`[undefined]` is serialized as `[null]`');
+    // Property enumeration is implementation-dependent.
+    var value = {
+      jdalton: ['John-David', 29],
+      kitcambridge: ['Kit', 18],
+      mathias: ['Mathias', 23]
+    };
+    parses(value, JSON.stringify(value), 'Objects are serialized recursively');
+    // Complex cyclic structures.
+    value = {
+      foo: {
+        b: {
+          foo: {
+            c: {
+              foo: null
+            }
+          }
+        }
+      }
+    };
+    serializes('{"foo":{"b":{"foo":{"c":{"foo":null}}}}}', value, 'Nested objects containing identically-named properties should serialize correctly');
+    var S = [], N = {};
+    S.push(N, N);
+    serializes('[{},{}]', S, 'Objects containing duplicate references should not throw a `TypeError`');
+    value.foo.b.foo.c.foo = value;
+    cyclicError(value, 'Objects containing complex circular references should throw a `TypeError`');
+    // Sparse arrays.
+    value = [];
+    value[5] = 1;
+    serializes('[null,null,null,null,null,1]', value, 'Sparse arrays should serialize correctly');
+    // Dates.
+    serializes('"1994-07-03T00:00:00.000Z"', new Date(Date.UTC(1994, 6, 3)), 'Dates should be serialized according to the simplified date time string format');
+    serializes('"1993-06-02T02:10:28.224Z"', new Date(Date.UTC(1993, 5, 2, 2, 10, 28, 224)), 'The date time string should conform to the format outlined in the spec');
+    serializes('"-271821-04-20T00:00:00.000Z"', new Date(-8.64e15), 'The minimum valid date value should serialize correctly');
+    serializes('"+275760-09-13T00:00:00.000Z"', new Date(8.64e15), 'The maximum valid date value should serialize correctly');
+    serializes('"+010000-01-01T00:00:00.000Z"', new Date(Date.UTC(10000, 0, 1)), 'https://bugs.ecmascript.org/show_bug.cgi?id=119');
+    value = new Date();
+    value.toJSON = function () {
+      return 'date';
+    };
+    serializes('"date"', value);
+    // Tests based on research by @Yaffle. See kriskowal/es5-shim#111.
+    serializes('"1969-12-31T23:59:59.999Z"', new Date(-1), 'Millisecond values < 1000 should be serialized correctly');
+    serializes('"-000001-01-01T00:00:00.000Z"', new Date(-621987552e5), 'Years prior to 0 should be serialized as extended years');
+    serializes('"+010000-01-01T00:00:00.000Z"', new Date(2534023008e5), 'Years after 9999 should be serialized as extended years');
+    serializes('"-109252-01-01T10:37:06.708Z"', new Date(-3509827334573292), 'Issue #4: Opera > 9.64 should correctly serialize a date with a year of `-109252`');
+    // Opera 7 normalizes dates with invalid time values to represent the
+    // current date.
+    value = new Date('Kit');
+    if (!isFinite(value)) {
+      expected += 1;
+      serializes('null', value, 'Invalid dates should serialize as `null`');
+    }
+    // Additional arguments.
+    serializes('[\n  1,\n  2,\n  3,\n  [\n    4,\n    5\n  ]\n]', [1, 2, 3, [4, 5]], 'Nested arrays; optional `whitespace` argument', null, '  ');
+    serializes('[]', [], 'Empty array; optional string `whitespace` argument', null, '  ');
+    serializes('{}', {}, 'Empty object; optional numeric `whitespace` argument', null, 2);
+    serializes('[\n  1\n]', [1], 'Single-element array; optional numeric `whitespace` argument', null, 2);
+    serializes('{\n  "foo": 123\n}', {
+      foo: 123
+    }, 'Single-member object; optional string `whitespace` argument', null, '  ');
+    serializes('{\n  "foo": {\n    "bar": [\n      123\n    ]\n  }\n}', {
+      foo: {
+        bar: [123]
+      }
+    }, 'Nested objects; optional numeric `whitespace` argument', null, 2);
+  });
+
+  /*
+   * The following tests are adapted from the ECMAScript 5 Conformance Suite.
+   * Copyright 2009, Microsoft Corporation. Distributed under the New BSD License.
+   *
+   * 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 Microsoft 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.
+  */
+  it('ECMAScript 5 Conformance', function () {
+    var value = {
+      a1: {
+        b1: [1, 2, 3, 4],
+        b2: {
+          c1: 1,
+          c2: 2
+        }
+      },
+      a2: 'a2'
+    };
+    // Section 15.12.1.1: The JSON Grammar.
+    // ------------------------------------
+    // Tests 15.12.1.1-0-1 thru 15.12.1.1-0-8.
+    parseError('12\t\r\n 34', 'Valid whitespace characters may not separate two discrete tokens');
+    parseError('\u000b1234', 'The vertical tab is not a valid whitespace character');
+    parseError('\u000c1234', 'The form feed is not a valid whitespace character');
+    parseError('\u00a01234', 'The non-breaking space is not a valid whitespace character');
+    parseError('\u200b1234', 'The zero-width space is not a valid whitespace character');
+    parseError('\ufeff1234', 'The byte order mark (zero-width non-breaking space) is not a valid whitespace character');
+    parseError('\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u30001234', 'Other Unicode category `Z` characters are not valid whitespace characters');
+    parseError('\u2028\u20291234', 'The line (U+2028) and paragraph (U+2029) separators are not valid whitespace characters');
+    // Test 15.12.1.1-0-9.
+    parses({
+      property: {},
+      prop2: [true, null, 123.456]
+    },
+      '\t\r \n{\t\r \n' +
+      '"property"\t\r \n:\t\r \n{\t\r \n}\t\r \n,\t\r \n' +
+      '"prop2"\t\r \n:\t\r \n' +
+      '[\t\r \ntrue\t\r \n,\t\r \nnull\t\r \n,123.456\t\r \n]' +
+      '\t\r \n}\t\r \n',
+    'Valid whitespace characters may precede and follow all tokens');
+    // Tests 15.12.1.1-g1-1 thru 15.12.1.1-g1-4.
+    parses(1234, '\t1234', 'Leading tab characters should be ignored');
+    parseError('12\t34', 'A tab character may not separate two disparate tokens');
+    parses(1234, '\r1234', 'Leading carriage returns should be ignored');
+    parseError('12\r34', 'A carriage return may not separate two disparate tokens');
+    parses(1234, '\n1234', 'Leading line feeds should be ignored');
+    parseError('12\n34', 'A line feed may not separate two disparate tokens');
+    parses(1234, ' 1234', 'Leading space characters should be ignored');
+    parseError('12 34', 'A space character may not separate two disparate tokens');
+    // Tests 15.12.1.1-g2-1 thru 15.12.1.1-g2-5.
+    parses('abc', '"abc"', 'Strings must be enclosed in double quotes');
+    parseError('\'abc\'', 'Single-quoted strings are not permitted');
+    // Note: the original test 15.12.1.1-g2-3 (`"\u0022abc\u0022"`) is incorrect,
+    // as the JavaScript interpreter will always convert `\u0022` to `"`.
+    parseError('\\u0022abc\\u0022', 'Unicode-escaped double quote delimiters are not permitted');
+    parseError('"abc\'', 'Strings must terminate with a double quote character');
+    parses('', '""', 'Strings may be empty');
+    // Tests 15.12.1.1-g4-1 thru 15.12.1.1-g4-4.
+    parseError('"\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007"', 'Unescaped control characters in the range [U+0000, U+0007] are not permitted within strings');
+    parseError('"\u0008\u0009\u000a\u000b\u000c\u000d\u000e\u000f"', 'Unescaped control characters in the range [U+0008, U+000F] are not permitted within strings');
+    parseError('"\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017"', 'Unescaped control characters in the range [U+0010, U+0017] are not permitted within strings');
+    parseError('"\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f"', 'Unescaped control characters in the range [U+0018, U+001F] are not permitted within strings');
+    // Tests 15.12.1.1-g5-1 thru 15.12.1.1-g5-3.
+    parses('X', '"\\u0058"', 'Unicode escape sequences are permitted within strings');
+    parseError('"\\u005"', 'Unicode escape sequences may not comprise fewer than four hexdigits');
+    parseError('"\\u0X50"', 'Unicode escape sequences may not contain non-hex characters');
+    // Tests 15.12.1.1-g6-1 thru 15.12.1.1-g6-7.
+    parses('/', '"\\/"', 'Escaped solidus');
+    parses('\\', '"\\\\"', 'Escaped reverse solidus');
+    parses('\b', '"\\b"', 'Escaped backspace');
+    parses('\f', '"\\f"', 'Escaped form feed');
+    parses('\n', '"\\n"', 'Escaped line feed');
+    parses('\r', '"\\r"', 'Escaped carriage return');
+    parses('\t', '"\\t"', 'Escaped tab');
+
+    // Section 15.12.3: `JSON.stringify()`.
+    // ------------------------------------
+    // Test 15.12.3-11-1 thru 5.12.3-11-15.
+    serializes(void 0, void 0, '`JSON.stringify(undefined)` should return `undefined`');
+    serializes('"replacement"', void 0, 'The `JSON.stringify` callback function can be called on a top-level `undefined` value', function () {
+      return 'replacement';
+    });
+    serializes('"a string"', 'a string', '`JSON.stringify` should serialize top-level string primitives');
+    serializes('123', 123, '`JSON.stringify` should serialize top-level number primitives');
+    serializes('true', true, '`JSON.stringify` should serialize top-level Boolean primitives');
+    serializes('null', null, '`JSON.stringify` should serialize top-level `null` values');
+    serializes('42', Object(42), '`JSON.stringify` should serialize top-level number objects');
+    serializes('"wrapped"', Object('wrapped'), '`JSON.stringify` should serialize top-level string objects');
+    serializes('false', Object(false), '`JSON.stringify` should serialize top-level Boolean objects');
+    serializes(void 0, 42, 'The `JSON.stringify` callback function may return `undefined` when called on a top-level number primitive', function () {
+      return void 0;
+    });
+    serializes(void 0, {
+      prop: 1
+    }, 'The `JSON.stringify` callback function may return `undefined` when called on a top-level object', function () {
+      return void 0;
+    });
+    serializes('[4,2]', 42, 'The `JSON.stringify` callback function may return an array when called on a top-level number primitive', function (key, value) {
+      return value === 42 ? [4, 2] : value;
+    });
+    serializes('{"forty":2}', 42, 'The `JSON.stringify` callback function may return an object literal when called on a top-level number primitive', function (key, value) {
+      return value === 42 ? {
+        forty: 2
+      } : value;
+    });
+    serializes(void 0, function () {}, '`JSON.stringify` should return `undefined` when called on a top-level function');
+    serializes('99', function () {}, 'The `JSON.stringify` callback function may return a number primitive when called on a top-level function', function () {
+      return 99;
+    });
+    // Test 15.12.3-4-1.
+    serializes('[42]', [42], '`JSON.stringify` should ignore `filter` arguments that are not functions or arrays', {});
+    // Test 15.12.3-5-a-i-1 and 15.12.3-5-b-i-1.
+    expect(JSON.stringify(value, null, 5), 'Optional `width` argument: Number object and primitive width values should produce identical results').toBe(JSON.stringify(value, null, Object(5)));
+    expect(JSON.stringify(value, null, 'xxx'), 'Optional `width` argument: String object and primitive width values should produce identical results').toBe(JSON.stringify(value, null, Object('xxx')));
+    // Test 15.12.3-6-a-1 and 15.12.3-6-a-2.
+    expect(JSON.stringify(value, null, 100), 'Optional `width` argument: The maximum numeric width value should be 10').toBe(JSON.stringify(value, null, 10));
+    expect(JSON.stringify(value, null, 5.99999), 'Optional `width` argument: Numeric values should be converted to integers').toBe(JSON.stringify(value, null, 5));
+    // Test 15.12.3-6-b-1 and 15.12.3-6-b-4.
+    expect(JSON.stringify(value, null, 0.999999), 'Optional `width` argument: Numeric width values between 0 and 1 should be ignored').toBe(JSON.stringify(value));
+    expect(JSON.stringify(value, null, 0), 'Optional `width` argument: Zero should be ignored').toBe(JSON.stringify(value));
+    expect(JSON.stringify(value, null, -5), 'Optional `width` argument: Negative numeric values should be ignored').toBe(JSON.stringify(value));
+    expect(JSON.stringify(value, null, 5), 'Optional `width` argument: Numeric width values in the range [1, 10] should produce identical results to that of string values containing `width` spaces').toBe(JSON.stringify(value, null, '     '));
+    // Test 15.12.3-7-a-1.
+    expect(JSON.stringify(value, null, '0123456789xxxxxxxxx'), 'Optional `width` argument: String width values longer than 10 characters should be truncated').toBe(JSON.stringify(value, null, '0123456789'));
+    // Test 15.12.3-8-a-1 thru 15.12.3-8-a-5.
+    expect(JSON.stringify(value, null, ''), 'Empty string `width` arguments should be ignored').toBe(JSON.stringify(value));
+    expect(JSON.stringify(value, null, true), 'Boolean primitive `width` arguments should be ignored').toBe(JSON.stringify(value));
+    expect(JSON.stringify(value, null, null), '`null` `width` arguments should be ignored').toBe(JSON.stringify(value));
+    expect(JSON.stringify(value, null, Object(false)), 'Boolean object `width` arguments should be ignored').toBe(JSON.stringify(value));
+    expect(JSON.stringify(value, null, value), 'Object literal `width` arguments should be ignored').toBe(JSON.stringify(value));
+    // Test 15.12.3@2-2-b-i-1.
+    serializes('["fortytwo objects"]', [
+      {
+        prop: 42,
+        toJSON: function () {
+          return 'fortytwo objects';
+        }
+      }
+    ], 'An object literal with a custom `toJSON` method nested within an array may return a string primitive for serialization');
+    // Test 15.12.3@2-2-b-i-2.
+    serializes('[42]', [
+      {
+        prop: 42,
+        toJSON: function () {
+          return Object(42);
+        }
+      }
+    ], 'An object literal with a custom `toJSON` method nested within an array may return a number object for serialization');
+    // Test 15.12.3@2-2-b-i-3.
+    serializes('[true]', [
+      {
+        prop: 42,
+        toJSON: function () {
+          return Object(true);
+        }
+      }
+    ], 'An object literal with a custom `toJSON` method nested within an array may return a Boolean object for serialization');
+    // Test 15.12.3@2-3-a-1.
+    serializes('["fortytwo"]', [42], 'The `JSON.stringify` callback function may return a string object when called on an array', function (key, value) {
+      return value === 42 ? Object('fortytwo') : value;
+    });
+    // Test 15.12.3@2-3-a-2.
+    serializes('[84]', [42], 'The `JSON.stringify` callback function may return a number object when called on an array', function (key, value) {
+      return value === 42 ? Object(84) : value;
+    });
+    // Test 15.12.3@2-3-a-3.
+    serializes('[false]', [42], 'The `JSON.stringify` callback function may return a Boolean object when called on an array', function (key, value) {
+      return value === 42 ? Object(false) : value;
+    });
+    // Test 15.12.3@4-1-2. 15.12.3@4-1-1 only tests whether an exception is
+    // thrown; the type of the exception is not checked.
+    value = {};
+    value.prop = value;
+    cyclicError(value, 'An object containing a circular reference should throw a `TypeError`');
+    // Test 15.12.3@4-1-3, modified to ensure that a `TypeError` is thrown.
+    value = {
+      p1: {
+        p2: {}
+      }
+    };
+    value.p1.p2.prop = value;
+    cyclicError(value, 'A nested cyclic structure should throw a `TypeError`');
+  });
+});