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45 lines
1.3 KiB
45 lines
1.3 KiB
1 year ago
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'use strict';
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var test = require('tape');
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var isArguments = require('../');
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var hasToStringTag = require('has-tostringtag/shams')();
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test('primitives', function (t) {
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t.notOk(isArguments([]), 'array is not arguments');
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t.notOk(isArguments({}), 'object is not arguments');
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t.notOk(isArguments(''), 'empty string is not arguments');
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t.notOk(isArguments('foo'), 'string is not arguments');
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t.notOk(isArguments({ length: 2 }), 'naive array-like is not arguments');
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t.end();
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});
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test('arguments object', function (t) {
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t.ok(isArguments(arguments), 'arguments is arguments');
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t.notOk(isArguments(Array.prototype.slice.call(arguments)), 'sliced arguments is not arguments');
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t.end();
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});
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test('old-style arguments object', function (t) {
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var isLegacyArguments = isArguments.isLegacyArguments || isArguments;
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var fakeOldArguments = {
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callee: function () {},
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length: 3
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};
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t.ok(isLegacyArguments(fakeOldArguments), 'old-style arguments is arguments');
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t.end();
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});
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test('Symbol.toStringTag', { skip: !hasToStringTag }, function (t) {
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var obj = {};
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obj[Symbol.toStringTag] = 'Arguments';
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t.notOk(isArguments(obj), 'object with faked toStringTag is not arguments');
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var args = (function () {
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return arguments;
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}());
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args[Symbol.toStringTag] = 'Arguments';
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t.notOk(isArguments(obj), 'real arguments with faked toStringTag is not arguments');
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t.end();
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});
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