UPD: improved tests.

apps/base/views.py

@@ -8,16 +8,23 @@ from django.views import generic
 
 class RootView(generic.TemplateView):
     template_name = 'base/root.html'
+    _default_color_hex = '47825b'
+
+    def _get_color_hex(self, hostname=None):
+        color_hex = self._default_color_hex
+        if hostname:
+            buf = hostname
+            buf = re.sub('[-.]', '', buf)
+            buf = buf[:6].lower()
+            if re.match('[0-9a-f]{6}', buf):
+                color_hex = buf
+        return color_hex
 
     def get_context_data(self, **kwargs):
         if 'hostname' not in kwargs:
             kwargs['hostname'] = socket.gethostname()
         if 'color_hex' not in kwargs:
-            buf = kwargs['hostname']
-            buf = re.sub('[-.]', '', buf)
-            buf = buf[:6].lower()
-            if re.match('[0-9a-f]{6}', buf):
-                kwargs['color_hex'] = buf
+            kwargs['color_hex'] = self._get_color_hex(kwargs['hostname'])
         if 'time' not in kwargs:
             kwargs['time'] = timezone.now()
         return super(RootView, self).get_context_data(**kwargs)