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easejs/test/test-class-abstract.js

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/**
* Tests abstract classes
*
* 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
*/
// don't perform these tests if getters/setters are unsupported
if ( Object.prototype.__defineGetter__ === undefined )
{
return;
}
require( './common' );
var assert = require( 'assert' ),
Class = require( 'class' ),
abstractMethod = require( 'class' ).abstractMethod;
// not abstract
var Foo = Class.extend( {} );
// abstract
var AbstractFoo = Class.extend(
{
ctorCalled: false,
__construct: function()
{
this.ctorCalled = true;
},
method: abstractMethod( function( one, two, three ){} ),
second: abstractMethod(),
});
// still abstract (didn't provide a concrete implementation of both abstract
// methods)
var SubAbstractFoo = AbstractFoo.extend(
{
second: function()
{
},
});
// concrete
var ConcreteFoo = AbstractFoo.extend(
{
method: function( one, two, three )
{
},
second: function()
{
},
});
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assert.ok(
( abstractMethod() instanceof Function ),
"abstractMethod() returns a function"
);
assert.throws( function()
{
abstractMethod()();
}, Error, "Abstract methods cannot be called" );
assert.ok(
( Foo.isAbstract instanceof Function ),
"All classes should have an isAbstract() method"
);
assert.ok(
( Foo.abstractMethods instanceof Array ),
"All classes should provide a list of their abstract methods as an array"
);
assert.equal(
Foo.isAbstract(),
false,
"Classes are not abstract if they contain no abstract methods"
);
assert.equal(
AbstractFoo.isAbstract(),
true,
"Classes should be considered abstract if they contain any abstract methods"
);
assert.equal(
SubAbstractFoo.isAbstract(),
true,
"Subtypes of abstract types are abstract if they don't provide a " +
"concrete implementation for all abstract methods"
);
assert.ok(
( ( AbstractFoo.abstractMethods[ 0 ] == 'method' )
&& ( AbstractFoo.abstractMethods[ 1 ] == 'second' )
),
"Abstract classes should provide a list of their abstract methods' names"
);
assert.ok(
( ( SubAbstractFoo.abstractMethods[ 0 ] == 'method' )
&& ( SubAbstractFoo.abstractMethods[ 1 ] == undefined )
),
"Abstract subclasses should not have their concrete methods within the " +
"the abstract method list if the concrete method was abstract in " +
"its supertype"
);
assert.equal(
ConcreteFoo.abstractMethods.length,
0,
"Concrete classes should not have any abstract methods listed"
);
assert.equal(
ConcreteFoo.isAbstract(),
false,
"Subtypes of abstract types are not abstract if they provide concrete " +
"implementations of all abstract methods"
);
assert.throws( function()
{
new AbstractFoo();
new SubAbstractFoo();
}, Error, "Abstract classes cannot be instantiated" );
assert.ok(
new ConcreteFoo(),
"Concrete subclasses can be instantiated"
);
assert.equal(
( new ConcreteFoo() ).ctorCalled,
true,
"Can call constructors of abstract supertypes"
);