add maxLength to recording

docs/recording.md

@@ -5,6 +5,7 @@ This appender stores the log events in memory. It is mainly useful for testing (
 ## Configuration
 
 - `type` - `recording`
+- `maxLength` - `integer` (optional, defaults to undefined) - the maximum array length for the recording. If not specified, the array will grow until cleared
 
 There is no other configuration for this appender.
 

lib/appenders/recording.js

@@ -2,12 +2,15 @@ const debug = require('debug')('log4js:recording');
 
 const recordedEvents = [];
 
-function configure() {
+function configure(config) {
   return function (logEvent) {
     debug(
       `received logEvent, number of events now ${recordedEvents.length + 1}`
     );
     debug('log event was ', logEvent);
+    if (config.maxLength && recordedEvents.length >= config.maxLength) {
+      recordedEvents.shift();
+    }
     recordedEvents.push(logEvent);
   };
 }