165 lines
3.7 KiB
JavaScript
165 lines
3.7 KiB
JavaScript
/**
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* Tests util.copy
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*
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* Copyright (C) 2011 Mike Gerwitz
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*
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* This file is part of ease.js.
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*
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* ease.js is free software: you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser 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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* @author Mike Gerwitz
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*/
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var common = require( './common' ),
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assert = require( 'assert' ),
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util = common.require( 'util' ),
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copyTo = util.copyTo,
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get_set = !( util.definePropertyFallback() )
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;
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/**
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* Just a basic copy test. Ensure the values are copied by reference.
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*/
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( function testCopiesReferencesToDestinationObject()
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{
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var src = {
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a: 'a',
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b: 2,
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c: true,
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d: false,
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e: undefined,
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d: null,
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f: function() {},
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},
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dest = {}
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;
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copyTo( dest, src );
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for ( var key in src )
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{
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assert.deepEqual( src[ key ], dest[ key ],
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"Copies by reference by default"
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);
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}
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} )();
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/**
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* Same concept as above, but with getters/setters
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*/
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( function testGettersAndSettersAreCopiedByReferenceToDestinationObject()
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{
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// no use in performing the test if the engine doesn't support it
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if ( !get_set )
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{
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return;
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}
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var get = function() {},
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set = function() {},
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src = {},
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dest = {},
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result = null
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;
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Object.defineProperty( src, 'foo', {
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get: get,
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set: set,
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// so copy can actually see the property
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enumerable: true,
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} );
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copyTo( dest, src );
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// look up the getter/setter in dest
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result = Object.getOwnPropertyDescriptor( dest, 'foo' );
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// check getter
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assert.deepEqual( result.get, get,
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"Getter is copied by reference by default"
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);
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// check setter
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assert.deepEqual( result.set, set,
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"Setter is copied by reference by default"
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)
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} )();
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/**
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* For convenience
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*/
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( function testOperationReturnsDest()
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{
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var dest = {};
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assert.deepEqual( copyTo( dest, {} ), dest,
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"Copy operation returns dest"
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);
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} )();
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/**
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* Just one of those tests you feel silly for making but is required
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*/
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( function testThrowsErrorIfSourceOrDestAreNotGiven()
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{
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assert['throws']( function()
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{
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copyTo();
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}, TypeError, "Dest parameter is required" );
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assert['throws']( function()
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{
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copyTo( 'bla', {} );
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}, TypeError, "Dest parameter is required to be an object" );
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assert['throws']( function()
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{
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copyTo( {} );
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}, TypeError, "Src parameter is required" );
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assert['throws']( function()
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{
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copyTo( {}, 'foo' );
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}, TypeError, "Src parameter is required to be an object" );
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} )();
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/**
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* For convenience, let's support a deep copy as well, just in case they don't
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* want to copy everything by reference.
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*/
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( function testCanDeepCopy()
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{
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var src = { foo: [ 1, 2, 3 ] },
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dest = copyTo( {}, src, true );
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// copied values should be equal by value...
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assert.deepEqual( src.val, dest.val,
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"Copied values should be comparitively equal with deep copy"
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);
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// ...but not by reference
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assert.ok( src.foo !== dest.foo,
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"Copied values should not be the same object after deep copy"
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);
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} )();
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