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easejs/test/test-member_builder-prop.js

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2011-01-18 23:47:58 -05:00
/**
* Tests property builder
*
* 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' ),
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assert = require( 'assert' ),
mb_common = require( __dirname + '/inc-member_builder-common' ),
builder = common.require( 'member_builder' ),
util = common.require( 'util' )
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;
mb_common.value = { baj: 'baz' };
mb_common.buildMember = builder.buildProp
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// do assertions common to all member builders
mb_common.assertCommon();
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( function testCannotOverrideMethodWithProperty()
{
// add a method
mb_common.buildMember = builder.buildMethod;
mb_common.value = function() {};
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mb_common.buildMemberQuick();
assert.throws( function()
{
// reset
mb_common.buildMember = builder.buildProp;
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// attempt to override with property
mb_common.value = 'foo';
mb_common.buildMemberQuick( {}, true );
}, TypeError, "Cannot override method with property" );
} )();
/**
* Abstract properties do not make sense. Simple as that.
*/
( function testCannotDeclareAbstractProperty()
{
assert.throws( function()
{
mb_common.buildMemberQuick( { 'abstract': true } );
}, TypeError, "Cannot declare abstract property" );
} )();
/**
* Properties, unlike methods, are virtual by default. If a property's value can
* be reassigned, why would a subclass not be able to reassign it? If one wishes
* to prevent a property's value from changing, they should use the visibility
* modifiers or declare the property as a constant.
*/
( function testCannotDeclareVirtualProperty()
{
try
{
mb_common.buildMemberQuick( { 'virtual': true } );
}
catch ( e )
{
assert.ok(
e.message.search( mb_common.name ) !== -1,
"Virtual property error message should contain property name"
);
return;
}
assert.fail( "Should not be permitted to declare virtual properties" );
} )();
/*
* While getters act as properties, it doesn't make sense to override
* getters/setters with properties because they are fundamentally different.
*/
( function testCannotOverrideGetters()
{
if ( util.definePropertyFallback() )
{
return;
}
mb_common.members[ 'public' ] = {};
Object.defineProperty( mb_common.members[ 'public' ], mb_common.name, {
get: function() {},
} );
try
{
mb_common.value = 'foo';
mb_common.buildMemberQuick( {}, true );
}
catch ( e )
{
assert.ok( e.message.search( mb_common.name ) !== -1,
"Property override getter failure should contain property name"
);
// ensure we have the correct error
assert.ok( e.message.search( 'getter' ) !== -1,
"Proper error is thrown for getter override failure"
);
return;
}
assert.fail(
"Should not be permitted to override getters with properties"
);
} )();
/**
* While setters act as properties, it doesn't make sense to override
* getters/setters with properties because they are fundamentally different.
*/
( function testCannotOverrideSetters()
{
if ( util.definePropertyFallback() )
{
return;
}
mb_common.members[ 'public' ] = {};
Object.defineProperty( mb_common.members[ 'public' ], mb_common.name, {
set: function() {},
} );
try
{
mb_common.value = 'foo';
mb_common.buildMemberQuick( {}, true );
}
catch ( e )
{
assert.ok( e.message.search( mb_common.name ) !== -1,
"Property override setter failure should contain method name"
);
// ensure we have the correct error
assert.ok( e.message.search( 'setter' ) !== -1,
"Proper error is thrown for setter override failure"
);
return;
}
assert.fail(
"Should not be permitted to override setters with properties"
);
} )();