liza/test/system/EventMediatorTest.ts

/**
 * Event logger test
 *
 *  Copyright (C) 2010-2019 R-T Specialty, LLC.
 *
 *  This file is part of the Liza Data Collection Framework.
 *
 *  liza is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero 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 Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import { EventMediator as Sut } from '../../src/system/EventMediator';
import { context } from '../../src/error/ContextError';
import { EventEmitter } from "events";
import { expect } from 'chai';
import { PsrLogger } from '../../src/system/PsrLogger';


describe( 'system.EventMediator captures and logs events', () =>
{
    it( 'document-processed triggers log#notice', () =>
    {
        let method_called = false;

        const event_id = 'document-processed';
        const emitter  = new EventEmitter();
        const log      = createMockLogger();

        log.notice = ( _str: string ) => { method_called = true; };

        new Sut( log, emitter );

        emitter.emit( event_id );

        expect( method_called ).to.be.true;
    } );

    it( 'delta-publish triggers log#notice', () =>
    {
        let method_called = false;

        const event_id = 'delta-publish';
        const emitter  = new EventEmitter();
        const log      = createMockLogger();

        log.notice = ( _str: string ) => { method_called = true; };

        new Sut( log, emitter );

        emitter.emit( event_id );

        expect( method_called ).to.be.true;
    } );

    it( 'amqp-conn-warn triggers log#warning', () =>
    {
        let method_called = false;

        const event_id = 'amqp-conn-warn';
        const emitter  = new EventEmitter();
        const log      = createMockLogger();

        log.warning = ( _str: string ) => { method_called = true; };

        new Sut( log, emitter );

        emitter.emit( event_id );

        expect( method_called ).to.be.true;
    } );

    it( 'amqp-reconnect triggers log#warning', () =>
    {
        let method_called = false;

        const event_id = 'amqp-reconnect';
        const emitter  = new EventEmitter();
        const log      = createMockLogger();

        log.warning = ( _str: string ) => { method_called = true; };

        new Sut( log, emitter );

        emitter.emit( event_id );

        expect( method_called ).to.be.true;
    } );

    it( 'context and stack are retrieved from error', () =>
    {
        let method_called = false;

        const event_id    = 'error';
        const err_msg     = 'Foo';
        const stub_err    = new Error( err_msg );
        const emitter     = new EventEmitter();
        const log         = createMockLogger();
        const err_context = { bar: 'baz' };

        const expected_context = {
            bar:   err_context.bar,
            stack: stub_err.stack,
        };

        log.error = ( str: string, context: any ) =>
        {
            expect( str ).to.equal( err_msg );
            expect( context ).to.deep.equal( expected_context );

            method_called = true;
        };

        new Sut( log, emitter );

        emitter.emit( event_id, context( stub_err, err_context ) );

        expect( method_called ).to.be.true;
    } );
} );


function createMockLogger(): PsrLogger
{
    return <PsrLogger>{
        debug( _msg: string | object, _context: object ){},
        info( _msg: string | object, _context: object ){},
        notice( _msg: string | object, _context: object ){ console.log( 'asdasd msg: ', _msg ); },
        warning( _msg: string | object, _context: object ){},
        error( _msg: string | object, _context: object ){},
        critical( _msg: string | object, _context: object ){},
        alert( _msg: string | object, _context: object ){},
        emergency( _msg: string | object, _context: object ){},
        log( _level: any, _msg: string | object, _context: object ){},
    };
}