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easejs/test/test-class_builder-final.js

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/**
* Tests final members
*
* Copyright (C) 2010, 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/>.
*
* @author Mike Gerwitz
*/
var common = require( './common' ),
assert = require( 'assert' ),
builder = common.require( 'ClassBuilder' )(
common.require( 'MemberBuilder' )(),
common.require( 'VisibilityObjectFactoryFactory' ).fromEnvironment()
),
Class = common.require( 'class' ),
FinalClass = common.require( 'class_final' )
;
/**
* Ensure that FinalClass properly forwards data to create a new Class.
*/
( function testFinalClassesAreValidClasses()
{
assert.ok( Class.isClass( FinalClass( {} ) ),
"Final classes should generate valid classes"
);
} )();
/**
* When a class is declared as final, it should prevent it from ever being
* extended. Ever.
*/
( function testFinalClassesCannotBeExtended()
{
try
{
// this should fail
FinalClass( 'Foo', {} ).extend( {} );
}
catch ( e )
{
assert.ok(
e.message.search( 'Foo' ) !== -1,
"Final class error message should contain name of class"
);
return;
}
assert.fail( "Should not be able to extend final classes" );
} )();
/**
* Ensure we're able to create final classes by extending existing classes.
*/
( function testCanCreateFinalSubtypes()
{
var Foo = builder.build( {} ),
FinalNamed = FinalClass( 'FinalNamed' ).extend( Foo, {} ),
FinalAnon = FinalClass.extend( Foo, {} )
;
// named
assert['throws']( function()
{
FinalNamed.extend( {} );
}, Error, "Cannot extend final named subtype" );
// anonymous
assert['throws']( function()
{
FinalAnon.extend( {} );
}, Error, "Cannot extend final anonymous subtype" );
} )();