81 lines
2.5 KiB
JavaScript
81 lines
2.5 KiB
JavaScript
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/**
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* Tests trait/class linearization
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*
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* Copyright (C) 2014 Mike Gerwitz
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*
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* This file is part of GNU ease.js.
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*
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* ease.js is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* GNU ease.js adopts Scala's concept of `linearization' with respect to
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* resolving calls to supertypes; the tests that follow provide a detailed
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* description of the concept, but readers may find it helpful to read
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* through the ease.js manual or Scala documentation.
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*/
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require( 'common' ).testCase(
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{
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caseSetUp: function()
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{
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this.Sut = this.require( 'Trait' );
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this.Class = this.require( 'class' );
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},
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/**
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* When a class mixes in a trait that defines some method M, and then
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* overrides it as M', then this.__super within M' should refer to M.
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* Note that this does not cause any conflicts with any class supertypes
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* that may define a method of the same name as M, because M must have
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* been an override, otherwise an error would have occurred.
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*/
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'Class super call refers to mixin that is part of a class definition':
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function()
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{
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var _self = this,
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scalled = false;
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var T = this.Sut(
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{
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// after mixin, this should be the super method
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'virtual public foo': function()
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{
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scalled = true;
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},
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} );
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this.Class.use( T ).extend(
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{
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// overrides mixed-in foo
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'override public foo': function()
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{
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// should invoke T.foo
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try
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{
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this.__super();
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}
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catch ( e )
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{
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_self.fail( false, true,
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"Super invocation failure: " + e.message
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);
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}
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},
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} )().foo();
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this.assertOk( scalled );
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},
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} );
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