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152 lines
8.5 KiB
JavaScript
152 lines
8.5 KiB
JavaScript
'use strict';
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var test = require('tape');
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var toPrimitive = require('../es6');
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var is = require('object-is');
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var forEach = require('foreach');
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var functionName = require('function.prototype.name');
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var debug = require('object-inspect');
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var hasSymbols = require('has-symbols')();
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var hasSymbolToPrimitive = hasSymbols && typeof Symbol.toPrimitive === 'symbol';
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test('function properties', function (t) {
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t.equal(toPrimitive.length, 1, 'length is 1');
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t.equal(functionName(toPrimitive), 'ToPrimitive', 'name is ToPrimitive');
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t.end();
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});
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var primitives = [null, undefined, true, false, 0, -0, 42, NaN, Infinity, -Infinity, '', 'abc'];
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test('primitives', function (t) {
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forEach(primitives, function (i) {
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t.ok(is(toPrimitive(i), i), 'toPrimitive(' + debug(i) + ') returns the same value');
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t.ok(is(toPrimitive(i, String), i), 'toPrimitive(' + debug(i) + ', String) returns the same value');
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t.ok(is(toPrimitive(i, Number), i), 'toPrimitive(' + debug(i) + ', Number) returns the same value');
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});
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t.end();
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});
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test('Symbols', { skip: !hasSymbols }, function (t) {
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var symbols = [
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Symbol('foo'),
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Symbol.iterator,
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Symbol['for']('foo') // eslint-disable-line no-restricted-properties
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];
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forEach(symbols, function (sym) {
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t.equal(toPrimitive(sym), sym, 'toPrimitive(' + debug(sym) + ') returns the same value');
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t.equal(toPrimitive(sym, String), sym, 'toPrimitive(' + debug(sym) + ', String) returns the same value');
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t.equal(toPrimitive(sym, Number), sym, 'toPrimitive(' + debug(sym) + ', Number) returns the same value');
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});
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var primitiveSym = Symbol('primitiveSym');
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var objectSym = Object(primitiveSym);
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t.equal(toPrimitive(objectSym), primitiveSym, 'toPrimitive(' + debug(objectSym) + ') returns ' + debug(primitiveSym));
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t.equal(toPrimitive(objectSym, String), primitiveSym, 'toPrimitive(' + debug(objectSym) + ', String) returns ' + debug(primitiveSym));
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t.equal(toPrimitive(objectSym, Number), primitiveSym, 'toPrimitive(' + debug(objectSym) + ', Number) returns ' + debug(primitiveSym));
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t.end();
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});
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test('Arrays', function (t) {
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var arrays = [[], ['a', 'b'], [1, 2]];
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forEach(arrays, function (arr) {
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t.equal(toPrimitive(arr), String(arr), 'toPrimitive(' + debug(arr) + ') returns the string version of the array');
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t.equal(toPrimitive(arr, String), String(arr), 'toPrimitive(' + debug(arr) + ') returns the string version of the array');
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t.equal(toPrimitive(arr, Number), String(arr), 'toPrimitive(' + debug(arr) + ') returns the string version of the array');
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});
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t.end();
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});
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test('Dates', function (t) {
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var dates = [new Date(), new Date(0), new Date(NaN)];
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forEach(dates, function (date) {
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t.equal(toPrimitive(date), String(date), 'toPrimitive(' + debug(date) + ') returns the string version of the date');
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t.equal(toPrimitive(date, String), String(date), 'toPrimitive(' + debug(date) + ') returns the string version of the date');
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t.ok(is(toPrimitive(date, Number), Number(date)), 'toPrimitive(' + debug(date) + ') returns the number version of the date');
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});
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t.end();
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});
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var coercibleObject = { valueOf: function () { return 3; }, toString: function () { return 42; } };
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var valueOfOnlyObject = { valueOf: function () { return 4; }, toString: function () { return {}; } };
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var toStringOnlyObject = { valueOf: function () { return {}; }, toString: function () { return 7; } };
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var coercibleFnObject = {
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valueOf: function () { return function valueOfFn() {}; },
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toString: function () { return 42; }
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};
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var uncoercibleObject = { valueOf: function () { return {}; }, toString: function () { return {}; } };
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var uncoercibleFnObject = {
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valueOf: function () { return function valueOfFn() {}; },
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toString: function () { return function toStrFn() {}; }
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};
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test('Objects', function (t) {
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t.equal(toPrimitive(coercibleObject), coercibleObject.valueOf(), 'coercibleObject with no hint coerces to valueOf');
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t.equal(toPrimitive(coercibleObject, Number), coercibleObject.valueOf(), 'coercibleObject with hint Number coerces to valueOf');
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t.equal(toPrimitive(coercibleObject, String), coercibleObject.toString(), 'coercibleObject with hint String coerces to non-stringified toString');
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t.equal(toPrimitive(coercibleFnObject), coercibleFnObject.toString(), 'coercibleFnObject coerces to non-stringified toString');
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t.equal(toPrimitive(coercibleFnObject, Number), coercibleFnObject.toString(), 'coercibleFnObject with hint Number coerces to non-stringified toString');
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t.equal(toPrimitive(coercibleFnObject, String), coercibleFnObject.toString(), 'coercibleFnObject with hint String coerces to non-stringified toString');
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t.equal(toPrimitive({}), '[object Object]', '{} with no hint coerces to Object#toString');
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t.equal(toPrimitive({}, Number), '[object Object]', '{} with hint Number coerces to Object#toString');
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t.equal(toPrimitive({}, String), '[object Object]', '{} with hint String coerces to Object#toString');
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t.equal(toPrimitive(toStringOnlyObject), toStringOnlyObject.toString(), 'toStringOnlyObject returns non-stringified toString');
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t.equal(toPrimitive(toStringOnlyObject, Number), toStringOnlyObject.toString(), 'toStringOnlyObject with hint Number returns non-stringified toString');
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t.equal(toPrimitive(toStringOnlyObject, String), toStringOnlyObject.toString(), 'toStringOnlyObject with hint String returns non-stringified toString');
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t.equal(toPrimitive(valueOfOnlyObject), valueOfOnlyObject.valueOf(), 'valueOfOnlyObject returns valueOf');
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t.equal(toPrimitive(valueOfOnlyObject, Number), valueOfOnlyObject.valueOf(), 'valueOfOnlyObject with hint Number returns valueOf');
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t.equal(toPrimitive(valueOfOnlyObject, String), valueOfOnlyObject.valueOf(), 'valueOfOnlyObject with hint String returns non-stringified valueOf');
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t.test('Symbol.toPrimitive', { skip: !hasSymbolToPrimitive }, function (st) {
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var overriddenObject = { toString: st.fail, valueOf: st.fail };
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overriddenObject[Symbol.toPrimitive] = function (hint) { return String(hint); };
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st.equal(toPrimitive(overriddenObject), 'default', 'object with Symbol.toPrimitive + no hint invokes that');
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st.equal(toPrimitive(overriddenObject, Number), 'number', 'object with Symbol.toPrimitive + hint Number invokes that');
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st.equal(toPrimitive(overriddenObject, String), 'string', 'object with Symbol.toPrimitive + hint String invokes that');
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var nullToPrimitive = { toString: coercibleObject.toString, valueOf: coercibleObject.valueOf };
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nullToPrimitive[Symbol.toPrimitive] = null;
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st.equal(toPrimitive(nullToPrimitive), toPrimitive(coercibleObject), 'object with no hint + null Symbol.toPrimitive ignores it');
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st.equal(toPrimitive(nullToPrimitive, Number), toPrimitive(coercibleObject, Number), 'object with hint Number + null Symbol.toPrimitive ignores it');
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st.equal(toPrimitive(nullToPrimitive, String), toPrimitive(coercibleObject, String), 'object with hint String + null Symbol.toPrimitive ignores it');
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st.test('exceptions', function (sst) {
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var nonFunctionToPrimitive = { toString: sst.fail, valueOf: sst.fail };
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nonFunctionToPrimitive[Symbol.toPrimitive] = {};
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sst['throws'](toPrimitive.bind(null, nonFunctionToPrimitive), TypeError, 'Symbol.toPrimitive returning a non-function throws');
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var uncoercibleToPrimitive = { toString: sst.fail, valueOf: sst.fail };
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uncoercibleToPrimitive[Symbol.toPrimitive] = function (hint) {
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return { toString: function () { return hint; } };
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};
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sst['throws'](toPrimitive.bind(null, uncoercibleToPrimitive), TypeError, 'Symbol.toPrimitive returning an object throws');
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var throwingToPrimitive = { toString: sst.fail, valueOf: sst.fail };
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throwingToPrimitive[Symbol.toPrimitive] = function (hint) { throw new RangeError(hint); };
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sst['throws'](toPrimitive.bind(null, throwingToPrimitive), RangeError, 'Symbol.toPrimitive throwing throws');
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sst.end();
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});
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st.end();
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});
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t.test('exceptions', function (st) {
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st['throws'](toPrimitive.bind(null, uncoercibleObject), TypeError, 'uncoercibleObject throws a TypeError');
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st['throws'](toPrimitive.bind(null, uncoercibleObject, Number), TypeError, 'uncoercibleObject with hint Number throws a TypeError');
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st['throws'](toPrimitive.bind(null, uncoercibleObject, String), TypeError, 'uncoercibleObject with hint String throws a TypeError');
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st['throws'](toPrimitive.bind(null, uncoercibleFnObject), TypeError, 'uncoercibleFnObject throws a TypeError');
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st['throws'](toPrimitive.bind(null, uncoercibleFnObject, Number), TypeError, 'uncoercibleFnObject with hint Number throws a TypeError');
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st['throws'](toPrimitive.bind(null, uncoercibleFnObject, String), TypeError, 'uncoercibleFnObject with hint String throws a TypeError');
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st.end();
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});
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t.end();
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});
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