Fix logs buffer clearing and clear it before each test

tests/mockLogzioListener/listener.py

@@ -73,7 +73,7 @@ class MockLogzioListener:
         return len(self.logs_list)
 
     def clear_logs_buffer(self):
-        self.logs_list = []
+        self.logs_list[:] = []
 
     def set_server_error(self):
         self.persistent_flags.set_server_error()

tests/test_logzioSender.py

@@ -21,6 +21,7 @@ def _find(pattern, path):
 class TestLogzioSender(TestCase):
     def setUp(self):
         self.logzio_listener = listener.MockLogzioListener()
+        self.logzio_listener.clear_logs_buffer()
         self.logzio_listener.clear_server_error()
         self.logs_drain_timeout = 1