104 lines
3.2 KiB
JavaScript
104 lines
3.2 KiB
JavaScript
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/**
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* Tests basic trait definition
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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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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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this.AbstractClass = this.require( 'class_abstract' );
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},
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/**
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* If a trait contains an abstract member, then any class that uses it
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* should too be considered abstract if no concrete implementation is
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* provided.
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*/
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'Abstract traits create abstract classes when used': function()
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{
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var T = this.Sut( { 'abstract foo': [] } );
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var _self = this;
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this.assertDoesNotThrow( function()
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{
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// no concrete `foo; should be abstract (this test is sufficient
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// because AbstractClass will throw an error if there are no
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// abstract members)
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_self.AbstractClass.use( T ).extend( {} );
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}, Error );
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},
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/**
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* A class may still be concrete even if it uses abstract traits so long
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* as it provides concrete implementations for each of the trait's
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* abstract members.
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*/
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'Concrete classes may use abstract traits by definining members':
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function()
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{
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var T = this.Sut( { 'abstract traitfoo': [ 'foo' ] } ),
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C = null,
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called = false;
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var _self = this;
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this.assertDoesNotThrow( function()
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{
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C = _self.Class.use( T ).extend(
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{
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traitfoo: function( foo ) { called = true; },
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} );
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} );
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// sanity check
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C().traitfoo();
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this.assertOk( called );
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},
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/**
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* The concrete methods provided by a class must be compatible with the
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* abstract definitions of any used traits. This test ensures not only
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* that the check is being performed, but that the abstract declaration
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* is properly inherited from the trait.
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*
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* TODO: The error mentions "supertype" compatibility, which (although
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* true) may be confusing; perhaps reference the trait that declared the
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* method as abstract.
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*/
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'Concrete classes must be compatible with abstract traits': function()
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{
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var T = this.Sut( { 'abstract traitfoo': [ 'foo' ] } );
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var _self = this;
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this.assertThrows( function()
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{
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C = _self.Class.use( T ).extend(
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{
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// missing param in definition
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traitfoo: function() { called = true; },
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} );
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} );
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},
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} );
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