diff --git a/log4js/log4js-tests.ts b/log4js/log4js-tests.ts
index 8540b6f218..10b6f9bbce 100644
--- a/log4js/log4js-tests.ts
+++ b/log4js/log4js-tests.ts
@@ -8,6 +8,21 @@ log4js.addAppender(log4js.appenders.file('logs/cheese.log'), 'cheese');
 var logger = log4js.getLogger('cheese');
 logger.setLevel('ERROR');
 
+if (logger.isLevelEnabled(log4js.levels.DEBUG))
+  logger.info('DEBUG is enabled');
+if (logger.isTraceEnabled())
+  logger.info('TRACE is enabled');
+if (logger.isDebugEnabled())
+  logger.info('DEBUG is enabled');
+if (logger.isInfoEnabled())
+  logger.info('INFO is enabled');
+if (logger.isWarnEnabled())
+  logger.info('WARN is enabled');
+if (logger.isErrorEnabled())
+  logger.info('ERROR is enabled');
+if (logger.isFatalEnabled())
+  logger.info('FATAL is enabled');
+
 logger.trace('Entering cheese testing');
 logger.debug('Got cheese.');
 logger.info('Cheese is Gouda.');
diff --git a/log4js/log4js.d.ts b/log4js/log4js.d.ts
index ea5345dd2f..4e1cfc43b1 100644
--- a/log4js/log4js.d.ts
+++ b/log4js/log4js.d.ts
@@ -99,6 +99,14 @@ declare module "log4js" {
     setLevel(level: string): void;
     setLevel(level: Level): void;
 
+    isLevelEnabled(level: Level): boolean;
+    isTraceEnabled(): boolean;
+    isDebugEnabled(): boolean;
+    isInfoEnabled(): boolean;
+    isWarnEnabled(): boolean;
+    isErrorEnabled(): boolean;
+    isFatalEnabled(): boolean;
+
     trace(message: string, ...args: any[]): void;
     debug(message: string, ...args: any[]): void;
     info(message: string, ...args: any[]): void;