You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.4 KiB
44 lines
1.4 KiB
'use strict';
|
|
|
|
var test = require('tape');
|
|
var isArguments = require('./');
|
|
var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
|
|
|
|
test('primitives', function (t) {
|
|
t.notOk(isArguments([]), 'array is not arguments');
|
|
t.notOk(isArguments({}), 'object is not arguments');
|
|
t.notOk(isArguments(''), 'empty string is not arguments');
|
|
t.notOk(isArguments('foo'), 'string is not arguments');
|
|
t.notOk(isArguments({ length: 2 }), 'naive array-like is not arguments');
|
|
t.end();
|
|
});
|
|
|
|
test('arguments object', function (t) {
|
|
t.ok(isArguments(arguments), 'arguments is arguments');
|
|
t.notOk(isArguments(Array.prototype.slice.call(arguments)), 'sliced arguments is not arguments');
|
|
t.end();
|
|
});
|
|
|
|
test('old-style arguments object', function (t) {
|
|
var isLegacyArguments = isArguments.isLegacyArguments || isArguments;
|
|
var fakeOldArguments = {
|
|
callee: function () {},
|
|
length: 3
|
|
};
|
|
t.ok(isLegacyArguments(fakeOldArguments), 'old-style arguments is arguments');
|
|
t.end();
|
|
});
|
|
|
|
test('Symbol.toStringTag', { skip: !hasToStringTag }, function (t) {
|
|
var obj = {};
|
|
obj[Symbol.toStringTag] = 'Arguments';
|
|
t.notOk(isArguments(obj), 'object with faked toStringTag is not arguments');
|
|
|
|
var args = (function () {
|
|
return arguments;
|
|
}());
|
|
args[Symbol.toStringTag] = 'Arguments';
|
|
t.notOk(isArguments(obj), 'real arguments with faked toStringTag is not arguments');
|
|
|
|
t.end();
|
|
});
|