JSTests/test262/test/built-ins/Number/prototype/toPrecision/this-type-not-number-or-number-object.js

// Copyright (C) 2016 The V8 Project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-number.prototype.toprecision
description: >
  Throws a TypeError if this value is not a number object or value
info: |
  20.1.3 Properties of the Number Prototype Object

  The Number prototype object is the intrinsic object %NumberPrototype%. The
  Number prototype object is an ordinary object. The Number prototype is itself
  a Number object; it has a [[NumberData]] internal slot with the value +0.

  [...]
  The abstract operation thisNumberValue(value) performs the following steps:

  1. If Type(value) is Number, return value.
  2. If Type(value) is Object and value has a [[NumberData]] internal slot, then
    a. Assert: value's [[NumberData]] internal slot is a Number value.
    b. Return the value of value's [[NumberData]] internal slot.
  3. Throw a TypeError exception.

  Number.prototype.toPrecision ( precision )

  1. Let x be ? thisNumberValue(this value).
  [...]
features: [Symbol]
---*/

var toPrecision = Number.prototype.toPrecision;

assert.throws(TypeError, function() {
  toPrecision.call({}, 1);
}, "{}");

assert.throws(TypeError, function() {
  toPrecision.call("1", 1);
}, "string");

assert.throws(TypeError, function() {
  toPrecision.call(Number, 1);
}, "Number");

assert.throws(TypeError, function() {
  toPrecision.call(true, 1);
}, "true");

assert.throws(TypeError, function() {
  toPrecision.call(false, 1);
}, "false");

assert.throws(TypeError, function() {
  toPrecision.call(null, 1);
}, "null");

assert.throws(TypeError, function() {
  toPrecision.call(undefined, 1);
}, "undefined");

assert.throws(TypeError, function() {
  toPrecision.call(Symbol("1"), 1);
}, "symbol");

assert.throws(TypeError, function() {
  toPrecision.call([], 1);
}, "[]");