diff --git a/flask/app.py b/flask/app.py
index dbc102f7..e5691edd 100644
--- a/flask/app.py
+++ b/flask/app.py
@@ -300,22 +300,9 @@ class Flask(_PackageBoundObject):
         with _logger_lock:
             if self._logger and self._logger.name == self.logger_name:
                 return self._logger
-            from logging import getLogger, StreamHandler, Formatter, \
-                                Logger,  DEBUG
-            class DebugLogger(Logger):
-                def getEffectiveLevel(x):
-                    return DEBUG if self.debug else Logger.getEffectiveLevel(x)
-            class DebugHandler(StreamHandler):
-                def emit(x, record):
-                    StreamHandler.emit(x, record) if self.debug else None
-            handler = DebugHandler()
-            handler.setLevel(DEBUG)
-            handler.setFormatter(Formatter(self.debug_log_format))
-            logger = getLogger(self.logger_name)
-            logger.__class__ = DebugLogger
-            logger.addHandler(handler)
-            self._logger = logger
-            return logger
+            from flask.logging import create_logger
+            self._logger = rv = create_logger(self)
+            return rv
 
     def create_jinja_environment(self):
         """Creates the Jinja2 environment based on :attr:`jinja_options`
diff --git a/flask/logging.py b/flask/logging.py
new file mode 100644
index 00000000..4ccd8b1b
--- /dev/null
+++ b/flask/logging.py
@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+"""
+    flask.logging
+    ~~~~~~~~~~~~~
+
+    Implements the logging support for Flask.
+
+    :copyright: (c) 2010 by Armin Ronacher.
+    :license: BSD, see LICENSE for more details.
+"""
+
+from __future__ import absolute_import
+
+from logging import getLogger, StreamHandler, Formatter, Logger,  DEBUG
+
+
+def create_logger(app):
+    """Creates a logger for the given application.  This logger works
+    similar to a regular Python logger but changes the effective logging
+    level based on the application's debug flag.  Furthermore this
+    function also removes all attached handlers in case there was a
+    logger with the log name before.
+    """
+
+    class DebugLogger(Logger):
+        def getEffectiveLevel(x):
+            return DEBUG if app.debug else Logger.getEffectiveLevel(x)
+
+    class DebugHandler(StreamHandler):
+        def emit(x, record):
+            StreamHandler.emit(x, record) if app.debug else None
+
+    handler = DebugHandler()
+    handler.setLevel(DEBUG)
+    handler.setFormatter(Formatter(app.debug_log_format))
+    logger = getLogger(app.logger_name)
+    # just in case that was not a new logger, get rid of all the handlers
+    # already attached to it.
+    del logger.handlers[:]
+    logger.__class__ = DebugLogger
+    logger.addHandler(handler)
+    return logger
diff --git a/flask/testing.py b/flask/testing.py
index fe7f8c2d..ee4bd28e 100644
--- a/flask/testing.py
+++ b/flask/testing.py
@@ -9,6 +9,7 @@
     :copyright: (c) 2010 by Armin Ronacher.
     :license: BSD, see LICENSE for more details.
 """
+
 from werkzeug import Client
 from flask import _request_ctx_stack