make logging quiet when running tests

tests/__init__.py

@@ -12,6 +12,7 @@ import              sys
 import              glob
 import              shutil
 import              tempfile
+import              logging
 import              contextlib
 import itertools as it
 import os.path   as op
@@ -23,6 +24,9 @@ from six import StringIO
 import fsl.data.image as fslimage
 
 
+logging.getLogger().setLevel(logging.WARNING)
+
+
 
 @contextlib.contextmanager
 def tempdir():