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easejs/test/ClassBuilder/ConstTest.js

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/**
* Tests const keyword
*
* Copyright (C) 2011, 2012, 2013 Mike Gerwitz
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*
* This file is part of GNU ease.js.
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*
* 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.
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*
* 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.
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*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
require( 'common' ).testCase(
{
caseSetUp: function()
{
// XXX: get rid of this disgusting mess; we're mid-refactor and all
// these dependencies should not be necessary for testing
this.Sut = this.require( 'ClassBuilder' );
this.MethodWrapperFactory = this.require( 'MethodWrapperFactory' );
this.wrappers = this.require( 'MethodWrappers' ).standard;
},
setUp: function()
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{
this.builder = this.Sut(
this.require( '/MemberBuilder' )(
this.MethodWrapperFactory( this.wrappers.wrapNew ),
this.MethodWrapperFactory( this.wrappers.wrapOverride ),
this.MethodWrapperFactory( this.wrappers.wrapProxy ),
this.getMock( 'MemberBuilderValidator' )
),
this.require( '/VisibilityObjectFactoryFactory' )
.fromEnvironment()
)
},
/** The const keyword should result in a static property. The rationale for
* this is that, if a value is constant, then instances do not make sense.
*/
'const keyword declares properties as static': function()
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{
var val = 'baz',
Foo = this.builder.build(
{
'const foo': val,
} )
;
this.assertEqual( val, Foo.$('foo'),
"Const keyword should declare properties as static"
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);
},
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/**
* As the name implies, constant properties should not be writable.
*/
'const keyword creates immutable property': function()
{
try
{
// this should fail (trying to alter const prop foo)
this.builder.build( { 'const foo': 'bar' } ).$( 'foo', 'baz' );
}
catch ( e )
{
this.assertOk(
e.message.search( 'foo' ) !== -1,
"Const modification error should contain name of property"
);
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return;
}
this.fail( "Constant properties should not be writable" );
},
/**
* Unlike other languages such as PHP, the const keyword can have different
* levels of visibility.
*/
'Access modifiers are permitted with const keyword': function()
{
var protval = 'bar',
privval = 'baz',
Foo = this.builder.build(
{
'protected const prot': protval,
'private const priv': privval,
'public static getProt': function()
{
return this.$('prot');
},
'public static getPriv': function()
{
return this.$('priv');
},
} ),
// be sure to override each method to ensure we're checking
// references on the subtype, *not* the parent type
SubFoo = this.builder.build( Foo,
{
'public static getProt': function()
{
return this.$('prot');
},
'public static getPriv': function()
{
return this.$('priv');
},
} )
;
this.assertEqual( Foo.$('prot'), undefined,
"Protected constants are not available publicly"
);
this.assertEqual( Foo.$('priv'), undefined,
"Private constants are not available publicly"
);
this.assertEqual( Foo.getProt(), protval,
"Protected constants are available internally"
);
this.assertEqual( Foo.getPriv(), privval,
"Private constants are available internally"
);
this.assertEqual( SubFoo.getProt(), protval,
"Protected constants are available to subtypes internally"
);
this.assertEqual( SubFoo.getPriv(), undefined,
"Private constants are NOT available to subtypes internally"
);
},
} );