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easejs/test/test-interface-extend.js

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JavaScript

/**
* Tests extending of interfaces
*
* Copyright (C) 2010 Mike Gerwitz
*
* This file is part of ease.js.
*
* ease.js is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @author Mike Gerwitz
* @package test
*/
var common = require( './common' ),
assert = require( 'assert' ),
Interface = common.require( 'interface' );
assert.throws( function()
{
Interface.extend(
{
// properties (non-methods) are not permitted
prop: 'not permitted',
});
}, TypeError, "Properties are not permitted within Interface definitions" );
assert.throws( function()
{
Interface.extend(
{
// concrete method
method: function() {}
});
}, TypeError, "Concrete methods are not permitted within Interface definitions" );
assert.doesNotThrow(
function()
{
Interface.extend(
{
'abstract method': [],
});
},
TypeError,
"Abstract method declarations are allowed within Interface definitions"
);
var BaseType = Interface.extend(
{
'abstract method': [],
});
assert.ok(
( BaseType.prototype.method instanceof Function ),
"Interface contains defined abstract methods"
);
var SubType = Interface.extend( BaseType,
{
'abstract second': [],
});
assert.ok(
( new SubType() instanceof BaseType ),
"Generic interface extend method can extend from other interfaces"
);
assert.ok(
( SubType.prototype.method === BaseType.prototype.method ),
"Interface subtypes inherit abstract methods"
);
assert.ok(
( SubType.prototype.second instanceof Function ),
"Interfaces can be extended with additional abstract methods"
);
assert.ok(
( BaseType.extend instanceof Function ),
"Interface contains extend method"
);
var SubType2 = BaseType.extend(
{
'abstract second': [],
});
assert.ok(
( new SubType2 instanceof BaseType ),
"Interface extend method can extend interfaces"
);
assert.ok(
( SubType2.prototype.second instanceof Function ),
"Interfaces can be extended with additional abstract methods using " +
"shorthand extend method"
);