/**
 * Tests interface naming
 *
 *  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
 */

var common     = require( './common' ),
    assert     = require( 'assert' ),
    Interface  = common.require( 'interface' )
;


/**
 * Interfaces may be named by passing the name as the first argument to the
 * module
 */
( function testInterfaceAcceptsName()
{
    assert.doesNotThrow( function()
    {
        var iface = Interface( 'Foo', {} );

        assert.equal(
            Interface.isInterface( iface ),
            true,
            "Interface defined with name is returned as a valid interface"
        );
    }, Error, "Interface accepts name" );
} )();


/**
 * The interface definition, which equates to the body of the interface, must be
 * an object
 */
( function testNamedInterfaceDefinitionRequiresThatDefinitionBeAnObject()
{
    var name = 'Foo';

    try
    {
        Interface( name, 'Bar' );

        // if all goes well, we'll never get to this point
        assert.fail(
            "Second argument to named interface must be the definition"
        );
    }
    catch ( e )
    {
        assert.notEqual(
            e.toString().match( name ),
            null,
            "Interface definition argument count error string contains " +
                "interface name"
        );
    }
} )();


/**
 * Extraneous arguments likely indicate a misunderstanding of the API
 */
( function testNamedInterfaceDefinitionIsStrictOnArgumentCount()
{
    var name = 'Foo',
        args = [ name, {}, 'extra' ]
    ;

    // we should be permitted only two arguments
    try
    {
        Interface.apply( null, args );

        // we should not get to this line (an exception should be thrown due to
        // too many arguments)
        assert.fail(
            "Should accept only two arguments when creating named interface"
        );
    }
    catch ( e )
    {
        var errstr = e.toString();

        assert.notEqual(
            errstr.match( name ),
            null,
            "Named interface error should provide interface name"
        );

        assert.notEqual(
            errstr.match( args.length + ' given' ),
            null,
            "Named interface error should provide number of given arguments"
        );
    }
} )();


/**
 * By default, anonymous interfacees should simply state that they are a
 * interface when they are converted to a string
 */
( function testConvertingAnonymousInterfaceToStringYieldsInterfaceString()
{
    assert.equal(
        Interface( {} ).toString(),
        '[object Interface]',
        "Converting anonymous interface to string yields interface string"
    );
} )();


/**
 * If the interface is named, then the name should be presented when it is
 * converted to a string
 */
( function testConvertingNamedInterfaceToStringYieldsInterfaceStringContainingName()
{
    var name = 'Foo';

    assert.equal(
        Interface( name, {} ).toString(),
        '[object Interface <' + name + '>]',
        "Converting named interface to string yields string with name of " +
            "interface"
    );
} )();