Improved testing method

Added shebangs, logging messages are now shown.
Running on an Rpi allows previewing the generated images.

inkycal/tests/helper_functions.py

@@ -0,0 +1,24 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+"""
+Helper functions for inkycal tests.
+Copyright by aceisace
+"""
+import logging
+import sys
+
+from os.path import exists
+from inkycal.modules.inky_image import Inkyimage
+
+preview =  Inkyimage.preview
+merge = Inkyimage.merge
+
+def get_environment():
+  # Check if this is running on the Raspberry Pi
+  environment = None
+  envir_path = '/sys/firmware/devicetree/base/model'
+  if exists(envir_path):
+    with open(envir_path) as file:
+      if 'Raspberry' in file.read():
+        environment = 'Raspberry'
+  return environment