77 lines
2.4 KiB
JavaScript
77 lines
2.4 KiB
JavaScript
/**
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* Tests pre-ES6 fallback symbol subset
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*
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* Copyright (C) 2014 Free Software Foundation, Inc.
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*
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* This file is part of GNU ease.js.
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*
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* ease.js is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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require( 'common' ).testCase(
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{
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caseSetUp: function()
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{
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this.Sut = this.require( 'util/symbol/FallbackSymbol' );
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},
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/**
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* Symbols are used to create an object fields that is accessible only
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* to the holder of a reference to the symbol used to create that field.
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* Since this fallback is intended to be used in environments that do
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* not support symbols, the alternative is to return a random string
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* that is highly unlikely to exist in practice. However, we must also
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* return an object to allow for instanceof checks. See below test for
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* more details.
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*/
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'Constructor returns an instance of Symbol': function()
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{
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var result = this.Sut();
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this.assertOk( result instanceof this.Sut );
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},
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/**
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* The generated string should be unique for each call, making it
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* unlikely that its value can be guessed. Of course, this relies on the
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* assumption that the runtime's PRNG is reliable and that it has not
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* been maliciously rewritten.
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*
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* Note that we don't test the various implementation details, as that
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* is intended to be opaque (see SUT source for details).
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*/
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'Generated string varies with each call': function()
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{
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var gen = {},
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i = 32;
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while ( i-- )
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{
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var result = this.Sut();
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if ( gen[ result ] )
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{
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this.fail( result, '' );
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}
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gen[ result ] = true;
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}
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// this prevents the test from being marked as incomplete
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this.assertOk( 'passed' );
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},
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} );
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