[Add] Utility class to hide prints during testing

Provides with HidePrints context manager and @HidePrints.hide decorator

tests/__init__.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# --------------------------------------------------------
+# Purpose: Convience imports for PyLoT
+#
+'''
+================================================
+PyLoT - the Python picking and Localization Tool
+================================================
+
+This python library contains a graphical user interfaces for picking
+seismic phases. This software needs ObsPy (http://github.com/obspy/obspy/wiki)
+and the Qt4 libraries to be installed first.
+
+PILOT has been developed in Mathworks' MatLab. In order to distribute
+PILOT without facing portability problems, it has been decided to re-
+develop the software package in Python. The great work of the ObsPy
+group allows easy handling of a bunch of seismic data and PyLoT will
+benefit a lot compared to the former MatLab version.
+
+The development of PyLoT is part of the joint research project MAGS2.
+
+:copyright:
+    The PyLoT Development Team
+:license:
+    GNU Lesser General Public License, Version 3
+    (http://www.gnu.org/copyleft/lesser.html)
+'''

tests/utils.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""Utilities/helpers for testing"""
+
+import sys
+import os
+
+
+class HidePrints:
+    """ 
+    Context manager that hides all standard output within its body.
+    The optional hide_prints argument can be used to quickly enable printing during debugging of tests.
+
+
+    Use (This will result in all console output of noisy_function to be suppressed):
+    from tests.utils import HidePrints
+    with HidePrints():
+        noise_function()
+    """
+
+    @staticmethod
+    def hide(func, *args, **kwargs):
+        """Decorator that hides all prints of the decorated function.
+
+        Use:
+        from tests.utils import HidePrints
+        @HidePrints.hide
+        def noise()
+            print("NOISE")
+        """
+
+        def silencer(*args, **kwargs):
+            with HidePrints():
+                func(*args, **kwargs)
+        return silencer
+
+    def __init__(self, hide_prints=True):
+        """Create object with hide_prints=False to disable print hiding"""
+        self.hide = hide_prints
+
+    def __enter__(self):
+        """Redirect stdout to /dev/null, save old stdout"""
+        if self.hide:
+            self._original_stdout = sys.stdout
+            devnull = open(os.devnull, "w")
+            sys.stdout = devnull
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        """Reinstate old stdout"""
+        if self.hide:
+            sys.stdout = self._original_stdout