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easejs/test/test-class_builder-final.js

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JavaScript

/**
* Tests final members
*
* 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' ),
builder = common.require( 'class_builder' )
;
/**
* Methods declared as final should not be able to be overridden by subtypes.
* Simple as that.
*/
( function testFinalMethodsCannotBeOverridenBySubtypes()
{
var Foo = builder.build(
{
'final public foo': function() {},
} );
try
{
// attempt to override (should fail)
builder.build( Foo,
{
'public foo': function() {},
} );
}
catch ( e )
{
assert.ok(
e.message.search( 'foo' ) !== -1,
"Final error message contains name of method"
);
return;
}
assert.fail( 'Should not be able to override final methods' );
} )();
/**
* Due to our static implementation (late static binding), the use of 'final'
* with properties doesn't make much sense. We have to deal with different
* problems than languages like Java that truly bind members statically. Consult
* the documentation for rationale.
*
* See also const keyword.
*/
( function testFinalKeywordCannotBeUsedWithProperties()
{
try
{
// attempt to define a 'final' property (should fail)
builder.build(
{
'final public foo': 'bar',
} );
}
catch ( e )
{
assert.ok(
e.message.search( 'foo' ) !== -1,
"Final property error message contains name of method"
);
return;
}
assert.fail( "Should not be able to use final keyword with properties" );
} )();