log4js-node/test/vows/logLevelFilter-test.js

'use strict';

const vows = require('vows');
const fs = require('fs');
const assert = require('assert');
const os = require('os');

const EOL = os.EOL || '\n';

function remove(filename) {
  try {
    fs.unlinkSync(filename);
  } catch (e) {
    // doesn't really matter if it failed
  }
}

vows.describe('log4js logLevelFilter').addBatch({
  appender: {
    topic: function () {
      const log4js = require('../../lib/log4js');
      const logEvents = [];

      log4js.clearAppenders();
      log4js.addAppender(
        require('../../lib/appenders/logLevelFilter')
          .appender(
            'ERROR',
            undefined,
            (evt) => {
              logEvents.push(evt);
            }
          ),
        'logLevelTest'
      );

      const logger = log4js.getLogger('logLevelTest');
      logger.debug('this should not trigger an event');
      logger.warn('neither should this');
      logger.error('this should, though');
      logger.fatal('so should this');
      return logEvents;
    },
    'should only pass log events greater than or equal to its own level': function (logEvents) {
      assert.equal(logEvents.length, 2);
      assert.equal(logEvents[0].data[0], 'this should, though');
      assert.equal(logEvents[1].data[0], 'so should this');
    }
  },

  configure: {
    topic: function () {
      const log4js = require('../../lib/log4js');


      remove(`${__dirname}/logLevelFilter.log`);
      remove(`${__dirname}/logLevelFilter-warnings.log`);
      remove(`${__dirname}/logLevelFilter-debugs.log`);

      log4js.configure('test/vows/with-logLevelFilter.json');
      const logger = log4js.getLogger('tests');
      logger.debug('debug');
      logger.info('info');
      logger.error('error');
      logger.warn('warn');
      logger.debug('debug');
      logger.trace('trace');
      // wait for the file system to catch up
      setTimeout(this.callback, 500);
    },
    'tmp-tests.log': {
      topic: function () {
        fs.readFile(`${__dirname}/logLevelFilter.log`, 'utf8', this.callback);
      },
      'should contain all log messages': function (contents) {
        const messages = contents.trim().split(EOL);
        assert.deepEqual(messages, ['debug', 'info', 'error', 'warn', 'debug', 'trace']);
      }
    },
    'tmp-tests-warnings.log': {
      topic: function () {
        fs.readFile(`${__dirname}/logLevelFilter-warnings.log`, 'utf8', this.callback);
      },
      'should contain only error and warning log messages': function (contents) {
        const messages = contents.trim().split(EOL);
        assert.deepEqual(messages, ['error', 'warn']);
      }
    },
    'tmp-tests-debugs.log': {
      topic: function () {
        fs.readFile(`${__dirname}/logLevelFilter-debugs.log`, 'utf8', this.callback);
      },
      'should contain only trace and debug log messages': function (contents) {
        const messages = contents.trim().split(EOL);
        assert.deepEqual(messages, ['debug', 'debug', 'trace']);
      }
    }
  }
}).export(module);