src/v8/test/mjsunit/get-prototype-of.js

// Copyright 2010 the V8 project authors. All rights reserved.
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//
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function assertPrototypeOf(func, expected) {
  assertEquals(expected, Object.getPrototypeOf(func));
}


assertThrows(function() {
  Object.getPrototypeOf(undefined);
}, TypeError);


assertThrows(function() {
  Object.getPrototypeOf(null);
}, TypeError);


function F(){};
var y = new F();

assertPrototypeOf(y, F.prototype);
assertPrototypeOf(F, Function.prototype);

assertPrototypeOf({x: 5}, Object.prototype);
assertPrototypeOf({x: 5, __proto__: null}, null);

assertPrototypeOf([1, 2], Array.prototype);


assertPrototypeOf(1, Number.prototype);
assertPrototypeOf(true, Boolean.prototype);
assertPrototypeOf(false, Boolean.prototype);
assertPrototypeOf('str', String.prototype);
assertPrototypeOf(Symbol(), Symbol.prototype);


var errorFunctions = [
  EvalError,
  RangeError,
  ReferenceError,
  SyntaxError,
  TypeError,
  URIError,
];

for (var f of errorFunctions) {
  assertPrototypeOf(f, Error);
  assertPrototypeOf(new f(), f.prototype);
}


// Builtin constructors.
var functions = [
  Array,
  ArrayBuffer,
  Boolean,
  // DataView,
  Date,
  Error,
  // Float32Array, prototype is %TypedArray%
  // Float64Array,
  Function,
  // Int16Array,
  // Int32Array,
  // Int8Array,
  Map,
  Number,
  Object,
  // Promise,
  RegExp,
  Set,
  String,
  // Symbol, not constructible
  // Uint16Array,
  // Uint32Array,
  // Uint8Array,
  // Uint8ClampedArray,
  WeakMap,
  WeakSet,
];

for (var f of functions) {
  assertPrototypeOf(f, Function.prototype);
  assertPrototypeOf(new f(), f.prototype);
}

var p = new Promise(function() {});
assertPrototypeOf(p, Promise.prototype);

var dv = new DataView(new ArrayBuffer());
assertPrototypeOf(dv, DataView.prototype);