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easejs/test/ClassBuilder/InstanceTest.js

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/**
* Tests treatment of class instances
*
2015-05-28 01:00:32 -04:00
* Copyright (C) 2014 Free Software Foundation, Inc.
*
* 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( 'ClassBuilder' );
},
/**
* Instance check delegation helps to keep ease.js extensible and more
* loosely coupled. If the given type implements a method
* __isInstanceOf, it will be invoked and its return value will be the
* result of the entire expression.
*/
'Delegates to type-specific instance method if present': function()
{
var _self = this;
// object to assert against
var obj = {},
called = false;
// mock type
var type = { __isInstanceOf: function( givent, giveno )
{
_self.assertStrictEqual( givent, type );
_self.assertStrictEqual( giveno, obj );
called = true;
return true;
} };
this.assertOk( this.Sut.isInstanceOf( type, obj ) );
this.assertOk( called );
},
/**
* In the event that the provided type does not provide any instance
* check method, we shall fall back to ECMAScript's built-in instanceof
* operator.
*/
'Falls back to ECMAScript instanceof check lacking type method':
function()
{
// T does not define __isInstanceOf
var T = function() {},
o = new T();
this.assertOk( this.Sut.isInstanceOf( T, o ) );
this.assertOk( !( this.Sut.isInstanceOf( T, {} ) ) );
},
/**
* The instanceof operator will throw an exception if the second operand
* is not a function. Our fallback shall not do that---it shall simply
* return false.
*/
'Fallback does not throw exception if type is not a constructor':
function()
{
var _self = this;
this.assertDoesNotThrow( function()
{
// type is not a ctor; should just return false
_self.assertOk( !( _self.Sut.isInstanceOf( {}, {} ) ) );
} );
},
} );