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easejs/test/ClassBuilder/FinalTest.js

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JavaScript

/**
* Tests final members
*
* Copyright (C) 2014 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.Class = this.require( 'class' );
this.FinalClass = this.require( 'class_final' );
},
/**
* Ensure that FinalClass properly forwards data to create a new Class.
*/
'Final classes are valid classes': function()
{
this.assertOk( this.Class.isClass( this.FinalClass( {} ) ),
"Final classes should generate valid classes"
);
},
/**
* When a class is declared as final, it should prevent it from ever
* being extended. Ever.
*/
'Final classes cannot be extended': function()
{
try
{
// this should fail
this.FinalClass( 'Foo', {} ).extend( {} );
}
catch ( e )
{
this.assertOk(
e.message.search( 'Foo' ) !== -1,
"Final class error message should contain name of class"
);
return;
}
this.assertFail( "Should not be able to extend final classes" );
},
/**
* Ensure we're able to create final classes by extending existing
* classes.
*/
'Can create final subtypes': function()
{
// XXX: clean up this mess.
var builder = this.require( 'ClassBuilder' )(
this.require( 'MemberBuilder' )(),
this.require( 'VisibilityObjectFactoryFactory' )
.fromEnvironment()
);
var Foo = builder.build( {} ),
FinalNamed = this.FinalClass( 'FinalNamed' ).extend( Foo, {} ),
FinalAnon = this.FinalClass.extend( Foo, {} )
;
// named (TODO: check error message)
this.assertThrows( function()
{
FinalNamed.extend( {} );
}, Error, "Cannot extend final named subtype" );
// anonymous (TODO: check error message)
this.assertThrows( function()
{
FinalAnon.extend( {} );
}, Error, "Cannot extend final anonymous subtype" );
},
} );