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easejs/test/test-class-extend.js

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/**
* Tests class module extend() method
*
* 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
*/
require( './common' );
var assert = require( 'assert' ),
Class = require( 'class' );
var foo_props = {
one: 1,
two: 2,
},
Foo = Class.extend( foo_props );
assert.ok(
( Foo.extend instanceof Function ),
"Created class contains extend method"
);
var sub_props = {
three: 3,
four: 4,
},
SubFoo = Foo.extend( sub_props );
assert.ok(
( SubFoo instanceof Object ),
"Subtype is returned as an object"
);
// ensure properties were inherited from supertype
for ( var prop in foo_props )
{
assert.equal(
foo_props[ prop ],
SubFoo.prototype[ prop ],
"Subtype inherits parent properties: " + prop
);
}
// and ensure that the subtype's properties were included
for ( var prop in sub_props )
{
assert.equal(
sub_props[ prop ],
SubFoo.prototype[ prop ],
"Subtype contains its own properties: " + prop
);
}
assert.ok(
( new SubFoo() instanceof Foo ),
"Subtypes must be considered to be instances of their supertypes"
);
// Foo
// |
// SubFoo
// / \
// SubSubFoo SubSubFoo2
//
var SubSubFoo = SubFoo.extend(),
SubSubFoo2 = SubFoo.extend();
assert.ok(
( new SubSubFoo() instanceof Foo ),
"Sub-subtypes should be instances of their super-supertype"
);
assert.ok(
!( new SubFoo() instanceof SubSubFoo ),
"Supertypes should not be considered instances of their subtypes"
);
assert.ok(
!( new SubSubFoo2() instanceof SubSubFoo ),
"Subtypes should not be considered instances of their siblings"
);