Direct logging to dev/null instead of stdout in tests to make test ou…

…tput clearer

tests/conftest.py

@@ -1,4 +1,5 @@
 import mock
+import os
 import pytest
 
 from flask import Flask
@@ -10,6 +11,17 @@
 from dmutils.logging import init_app
 
 
+@pytest.fixture(scope='session', autouse=True)
+def direct_stdout_to_null():
+    """Redirect logging to dev/null in tests only. Otherwise logger is set to stdout by default for dev envs.
+
+    See digitalmarketplace-utils/dmutils/logging.py::get_handler
+    """
+    with open(os.devnull, 'w') as null:
+        with mock.patch('dmutils.logging.sys.stdout', null):
+            yield
+
+
 @pytest.fixture
 def app(request):
     app = Flask(__name__)