Add tests for waitress log filter.

tests/test_logging_filters.py

@@ -0,0 +1,22 @@
+import logging
+
+from bazarr.app import UnwantedWaitressMessageFilter
+
+def test_true_for_bazarr():
+  record = logging.makeLogRecord({
+    "level": logging.INFO,
+    "msg": "a message from BAZARR for logging"
+  })
+  assert UnwantedWaitressMessageFilter().filter(record)
+
+def test_false_below_error():
+  record = logging.makeLogRecord({
+    "level": logging.INFO
+  })
+  assert not UnwantedWaitressMessageFilter().filter(record)
+
+def test_true_error_up():
+  record = logging.makeLogRecord({
+    "level": logging.CRITICAL
+  })
+  assert UnwantedWaitressMessageFilter().filter(record)