Suppress tests output

tests/utils/logger.py

@@ -0,0 +1,20 @@
+import logging
+
+
+class MockLoggerHandlers(object):
+    def __init__(self, l, num=2):
+        self._logger = l
+        self._handlers = l.handlers
+        self._num = num
+
+    def __enter__(self):
+        self._logger.handlers = [
+            logging.FileHandler("tmp{}.log".format(i))
+            for i in range(self._num)
+        ]
+        return self
+
+    def __exit__(self, exc_type=None, exc_val=None, exc_tb=None):
+        for h in self._logger.handlers:
+            h.close()
+        self._logger.handlers = self._handlers