Slightly improve JSON.parse coverage (#2196)

test/built-ins/JSON/parse/15.12.2-0-1.js

@@ -1,22 +0,0 @@
-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-info: |
-    This test should be run without any built-ins being added/augmented.
-    The name JSON must be bound to an object.
-    Section 15 says that every built-in Function object described in this
-    section <EFBFBD> whether as a constructor, an ordinary function, or both <EFBFBD> has
-    a length property whose value is an integer. Unless otherwise specified,
-    this value is equal to the largest number of named arguments shown in
-    the section headings for the function description, including optional
-    parameters.
-    This default applies to JSON.parse, and it must exist as a function
-    taking 2 parameters.
-es5id: 15.12.2-0-1
-description: JSON.parse must exist as a function
----*/
-
-var f = JSON.parse;
-
-assert.sameValue(typeof(f), "function", 'typeof(f)');

test/built-ins/JSON/parse/15.12.2-0-2.js

@@ -1,23 +0,0 @@
-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-info: |
-    This test should be run without any built-ins being added/augmented.
-    The name JSON must be bound to an object.
-    Section 15 says that every built-in Function object described in this
-    section <EFBFBD> whether as a constructor, an ordinary function, or both <EFBFBD> has
-    a length property whose value is an integer. Unless otherwise specified,
-    this value is equal to the largest number of named arguments shown in
-    the section headings for the function description, including optional
-    parameters.
-    This default applies to JSON.parse, and it must exist as a function
-    taking 2 parameters.
-es5id: 15.12.2-0-2
-description: JSON.parse must exist as a function taking 2 parameters
----*/
-
-var f = JSON.parse;
-
-assert.sameValue(typeof(f), "function", 'typeof(f)');
-assert.sameValue(f.length, 2, 'f.length');

test/built-ins/JSON/parse/15.12.2-0-3.js

@@ -1,16 +0,0 @@
-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-info: |
-    This test should be run without any built-ins being added/augmented.
-    The initial value of [[Configurable]] on JSON is true. This means we
-    should be able to delete (8.6.2.5) the stringify and parse properties.
-es5id: 15.12.2-0-3
-description: JSON.parse must be deletable (configurable)
----*/
-
-var o = JSON;
-var desc = Object.getOwnPropertyDescriptor(o, "parse");
-
-assert.sameValue(desc.configurable, true, 'desc.configurable');

test/built-ins/JSON/parse/builtin.js

@@ -0,0 +1,19 @@
+// Copyright (C) 2019 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-json.parse
+description: >
+  Requirements for built-in functions, defined in introduction of chapter 17,
+  are satisfied.
+includes: [isConstructor.js]
+features: [Reflect.construct]
+---*/
+
+var parse = JSON.parse;
+assert(Object.isExtensible(parse));
+assert.sameValue(typeof parse, 'function');
+assert.sameValue(Object.prototype.toString.call(parse), '[object Function]');
+assert.sameValue(Object.getPrototypeOf(parse), Function.prototype);
+
+assert.sameValue(parse.hasOwnProperty('prototype'), false);
+assert.sameValue(isConstructor(parse), false);

test/built-ins/JSON/parse/length.js

@@ -0,0 +1,25 @@
+// Copyright (C) 2012 Ecma International. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-json.parse
+description: >
+  JSON.parse.length is 2.
+info: |
+  JSON.parse ( text [ , reviver ] )
+
+  The "length" property of the parse function is 2.
+
+  ECMAScript Standard Built-in Objects
+
+  Unless otherwise specified, the length property of a built-in Function
+  object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+  [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+verifyProperty(JSON.parse, 'length', {
+  value: 2,
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});

test/built-ins/JSON/parse/name.js

@@ -2,6 +2,7 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
+esid: sec-json.parse
 es6id: 24.3.1
 description: >
   JSON.parse.name is "parse".
@@ -19,8 +20,9 @@ info: |
 includes: [propertyHelper.js]
 ---*/
 
-assert.sameValue(JSON.parse.name, "parse");
+verifyProperty(JSON.parse, 'name', {
-
+  value: 'parse',
-verifyNotEnumerable(JSON.parse, "name");
+  writable: false,
-verifyNotWritable(JSON.parse, "name");
+  enumerable: false,
-verifyConfigurable(JSON.parse, "name");
+  configurable: true,
+});

test/built-ins/JSON/parse/prop-desc.js

@@ -0,0 +1,20 @@
+// Copyright (C) 2012 Ecma International. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-json.parse
+description: >
+  Property descriptor of JSON.parse.
+info: |
+  ECMAScript Standard Built-in Objects
+
+  Every other data property described in clauses 18 through 26 and in Annex B.2
+  has the attributes { [[Writable]]: true, [[Enumerable]]: false,
+  [[Configurable]]: true } unless otherwise specified.
+includes: [propertyHelper.js]
+---*/
+
+verifyProperty(JSON, 'parse', {
+  writable: true,
+  enumerable: false,
+  configurable: true,
+});

test/built-ins/JSON/parse/text-negative-zero.js

@@ -0,0 +1,21 @@
+// Copyright (C) 2019 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-json.parse
+description: >
+  Top-level negative zero surrounded by whitespace is parsed correctly.
+info: |
+  JSON.parse ( text [ , reviver ] )
+
+  1. Let JText be ? ToString(text).
+  2. Parse JText interpreted as UTF-16 encoded Unicode points (6.1.4) as a JSON
+  text as specified in ECMA-404. Throw a SyntaxError exception if JText is not
+  a valid JSON text as defined in that specification.
+---*/
+
+assert.sameValue(JSON.parse('-0'), -0);
+assert.sameValue(JSON.parse(' \n-0'), -0);
+assert.sameValue(JSON.parse('-0  \t'), -0);
+assert.sameValue(JSON.parse('\n\t -0\n   '), -0);
+
+assert.sameValue(JSON.parse(-0), 0);

test/built-ins/JSON/parse/text-non-string-primitive.js

@@ -0,0 +1,34 @@
+// Copyright (C) 2019 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-json.parse
+description: >
+  Primitive values are coerced to strings and parsed.
+info: |
+  JSON.parse ( text [ , reviver ] )
+
+  1. Let JText be ? ToString(text).
+  2. Parse JText interpreted as UTF-16 encoded Unicode points (6.1.4) as a JSON
+  text as specified in ECMA-404. Throw a SyntaxError exception if JText is not
+  a valid JSON text as defined in that specification.
+features: [Symbol]
+---*/
+
+assert.throws(SyntaxError, function() {
+  JSON.parse();
+});
+
+assert.throws(SyntaxError, function() {
+  JSON.parse(undefined);
+});
+
+assert.sameValue(JSON.parse(null), null);
+assert.sameValue(JSON.parse(false), false);
+assert.sameValue(JSON.parse(true), true);
+assert.sameValue(JSON.parse(0), 0);
+assert.sameValue(JSON.parse(3.14), 3.14);
+
+var sym = Symbol('desc');
+assert.throws(TypeError, function() {
+  JSON.parse(sym);
+});

test/built-ins/JSON/parse/text-object-abrupt.js

@@ -0,0 +1,28 @@
+// Copyright (C) 2019 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-json.parse
+description: >
+  Abrupt completion from Get and Call in ToPrimitive.
+info: |
+  JSON.parse ( text [ , reviver ] )
+
+  1. Let JText be ? ToString(text).
+---*/
+
+assert.throws(Test262Error, function() {
+  JSON.parse({
+    toString: null,
+    get valueOf() {
+      throw new Test262Error();
+    },
+  });
+});
+
+assert.throws(Test262Error, function() {
+  JSON.parse({
+    toString: function() {
+      throw new Test262Error();
+    },
+  });
+});

test/built-ins/JSON/parse/text-object.js

@@ -0,0 +1,25 @@
+// Copyright (C) 2019 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-json.parse
+description: >
+  Objects are coerced to strings using ToString.
+info: |
+  JSON.parse ( text [ , reviver ] )
+
+  1. Let JText be ? ToString(text).
+  2. Parse JText interpreted as UTF-16 encoded Unicode points (6.1.4) as a JSON
+  text as specified in ECMA-404. Throw a SyntaxError exception if JText is not
+  a valid JSON text as defined in that specification.
+---*/
+
+var hint = JSON.parse({
+  toString: function() {
+    return '"string"';
+  },
+  valueOf: function() {
+    return '"default_or_number"';
+  },
+});
+
+assert.sameValue(hint, 'string');