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easejs/test/Util/CopyTest.js

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JavaScript

/**
* Tests util.copy
*
* Copyright (C) 2011, 2013 Mike Gerwitz
*
* This file is part of GNU ease.js.
*
* ease.js is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
require( 'common' ).testCase(
{
caseSetUp: function()
{
this.Sut = this.require( 'util' );
// are getters/setters supported?
this.hasGetSet = !( this.Sut.definePropertyFallback() );
},
/**
* Just a basic copy test: ensure the values are copied by reference.
*/
'Values are copied to destination object by reference': function()
{
var src = {
a: 'a',
b: 2,
c: true,
d: false,
e: undefined,
d: null,
f: function() {},
},
dest = {}
;
this.Sut.copyTo( dest, src );
for ( var key in src )
{
this.assertStrictEqual( src[ key ], dest[ key ] );
}
},
/**
* Same concept as above, but with getters/setters
*/
'Getters and setters are copied to destination object by reference':
function()
{
// no use in performing the test if the engine doesn't support it
if ( !( this.hasGetSet ) )
{
this.skip();
}
var get = function() {},
set = function() {},
src = {},
dest = {},
result = null
;
Object.defineProperty( src, 'foo', {
get: get,
set: set,
// so copy can actually see the property
enumerable: true,
} );
this.Sut.copyTo( dest, src );
// look up the getter/setter in dest
result = Object.getOwnPropertyDescriptor( dest, 'foo' );
// check getter
this.assertStrictEqual( result.get, get,
"Getter is copied by reference by default"
);
// check setter
this.assertDeepEqual( result.set, set,
"Setter is copied by reference by default"
);
},
/**
* For convenience (and a convention familar to uses of, notably, C
* APIs).
*/
'Copy operation returns destination object': function()
{
var dest = {};
this.assertStrictEqual( this.Sut.copyTo( dest, {} ), dest );
},
/**
* This is pretty self-explanatory.
*/
'Throws error if source or dest are not provided': function()
{
var copyTo = this.Sut.copyTo;
this.assertThrows( function()
{
copyTo();
}, TypeError, "Dest parameter is required" );
this.assertThrows( function()
{
copyTo( 'bla', {} );
}, TypeError, "Dest parameter is required to be an object" );
this.assertThrows( function()
{
copyTo( {} );
}, TypeError, "Src parameter is required" );
this.assertThrows( function()
{
copyTo( {}, 'foo' );
}, TypeError, "Src parameter is required to be an object" );
},
/**
* For convenience, let's support a deep copy as well, just in case they
* don't want to copy everything by reference.
*/
'Deep copies are supported': function()
{
var src = { foo: [ 1, 2, 3 ] },
dest = this.Sut.copyTo( {}, src, true );
// copied values should be equal by value...
this.assertDeepEqual( src.val, dest.val,
"Copied values should be comparitively equal with deep copy"
);
// ...but not by reference
this.assertNotStrictEqual( src.foo, dest.foo,
"Copied values should not be the same object after deep copy"
);
},
} );