trying to do CaptureLogOutputDuringTestsFilter (but no worky yet)

capsulflask/__init__.py

@@ -96,21 +96,28 @@ def create_app():
 
   app.config['HUB_URL'] = config.get("HUB_URL", app.config['BASE_URL'])
 
+  log_filters = {
+    'setLogLevelToDebugForHeartbeatRelatedMessages': {
+        '()': SetLogLevelToDebugForHeartbeatRelatedMessagesFilter,
+    }
+  }
+  if app.config['TESTING'] != False:
+    log_filters['captureLogOutputDuringTests'] = {
+        '()': CaptureLogOutputDuringTestsFilter,
+    }
+  
+
   logging_dict_config({
     'version': 1,
     'formatters': {'default': {
       'format': '[%(asctime)s] %(levelname)s in %(module)s: %(message)s',
     }},
-    'filters': {
-      'setLogLevelToDebugForHeartbeatRelatedMessages': {
-          '()': SetLogLevelToDebugForHeartbeatRelatedMessagesFilter,
-      }
-    },
+    'filters': log_filters,
     'handlers': {'wsgi': {
       'class': 'logging.StreamHandler',
       'stream': 'ext://flask.logging.wsgi_errors_stream',
       'formatter': 'default',
-      'filters': ['setLogLevelToDebugForHeartbeatRelatedMessages']
+      'filters': list(log_filters.keys())
     }},
     'root': {
       'level': app.config['LOG_LEVEL'],
@@ -270,3 +277,15 @@ class SetLogLevelToDebugForHeartbeatRelatedMessagesFilter(logging.Filter):
         return False
 
     return True
+
+
+class CaptureLogOutputDuringTestsFilter(logging.Filter):
+  def filter(self, record):
+    file_object = open('unittest-output.log', 'a')
+    file_object.write("%s" % record.msg)
+    for arg in record.args:
+      file_object.write("%s" % arg)
+
+    file_object.write("\n")
+    file_object.close()
+    return True