jstonic/test/lib.js

/**
 * Common test abstractions
 *
 *  Copyright (C) 2014 Mike Gerwitz
 *
 *  This file is part of jsTonic.
 *
 *  jstonic is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

var expect = require( 'chai' ).expect;


/**
 * Asserts that a method on C can be overridden, and executes mock code as part
 * of the override method
 *
 * The generated subclass is returned, allowing methods to be invoked to trigger
 * the execution of the overridden method.
 *
 * @param {Class}  C      class to attempt override on
 * @param {string} name   name of method to override
 * @param {Function} mock mock function for override
 *
 * @return {Class} generated subtype
 */
exports.checkOverride = ( C, name, mock ) =>
{
    var SubC;

    expect( () => SubC = C.extend( { [ `override ${name}` ]: mock } ) )
        .to.not.throw( Error );

    // allows performing actions to trigger function for mock
    return SubC;
};