UPD: improved tests.

.coveragerc

@@ -1,2 +1,3 @@
 [run]
-source = base
+source = apps.base
+omit = apps/base/tests/utils.py

apps/base/tests/test_urls.py

@@ -0,0 +1,10 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+from django.test import SimpleTestCase
+from django.urls import reverse
+
+
+class UrlsTestCase(SimpleTestCase):
+    def test_root_reverse(self):
+        response = self.client.get(reverse('root'))
+        self.assertEqual(response.status_code, 200)

apps/base/tests/test_views.py

@@ -1,31 +1,84 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
+import datetime
+import re
 import socket
+import unittest
 from django.test import SimpleTestCase
+from unittest import mock
+
+from ..views import RootView
 
 
-class DjangoAdminTestCase(SimpleTestCase):
+class RootUnitTestCase(unittest.TestCase):
+    def test_get_context_data(self):
+        default_color_hex = '47825b'
+
+        test_data_sets = [
+            {},
+            {'hostname': 'localhost'},
+            {'hostname': 'abcde'},
+            {'hostname': 'frodo.abcdef.example.com'},
+            {'hostname': 'aBc-dEf', 'expected_color_hex': 'abcdef'},
+            {'hostname': 'ab34EF12cd56ZZ', 'expected_color_hex': 'ab34ef'},
+            {'hostname': 'abcde.example.com', 'expected_color_hex': 'abcdee'},
+            {'hostname': 'abcdef', 'kwargs': {'color_hex': '123456'}, 'expected_color_hex': '123456'},
+        ]
+
+        real_hostname = socket.gethostname()
+
+        for test_data in test_data_sets:
+            if 'hostname' in test_data:
+                hostname = test_data['hostname']
+            else:
+                hostname = real_hostname
+
+            if 'expected_color_hex' in test_data:
+                expected_color_hex = test_data['expected_color_hex']
+            else:
+                expected_color_hex = default_color_hex
+
+            with mock.patch('socket.gethostname', return_value=hostname):
+                v = RootView()
+                if 'kwargs' in test_data:
+                    c = v.get_context_data(**test_data['kwargs'])
+                else:
+                    c = v.get_context_data()
+
+                self.assertIsInstance(c, dict)
+                self.assertIn('hostname', c)
+                self.assertEqual(c['hostname'], hostname)
+                self.assertIn('color_hex', c)
+                self.assertTrue(re.match('[0-9a-f]{6}', c['color_hex']))
+                self.assertEqual(c['color_hex'], expected_color_hex)
+                self.assertIn('time', c)
+                self.assertIsInstance(c['time'], datetime.datetime)
+
+
+class DjangoAdminDjangoTestCase(SimpleTestCase):
     def test_djangoadmin(self):
         response = self.client.get('/djangoadmin', follow=True)
         self.assertContains(response, 'Django administration')
 
 
-class RootTestCase(SimpleTestCase):
+class RootDjangoTestCase(SimpleTestCase):
-    def setUp(self):
-        super(RootTestCase, self).setUp()
-        self.response = self.client.get('/')
-
     def test_root_template(self):
-        response = self.response
+        response = self.client.get('/')
         self.assertTemplateUsed(response, 'base/root.html')
 
     def test_root_context(self):
-        response = self.response
+        response = self.client.get('/')
         self.assertIn('hostname', response.context)
         hostname = socket.gethostname()
         self.assertEqual(response.context['hostname'], hostname)
+        self.assertIn('color_hex', response.context)
+        self.assertTrue(re.match('[0-9a-f]{6}', response.context['color_hex']))
+        self.assertIn('time', response.context)
+        self.assertIsInstance(response.context['time'], datetime.datetime)
 
     def test_root_content(self):
-        response = self.response
+        response = self.client.get('/')
         hostname = socket.gethostname().capitalize()
         self.assertContains(response, hostname)
+
+

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']
+            kwargs['color_hex'] = self._get_color_hex(kwargs['hostname'])
-            buf = re.sub('[-.]', '', buf)
-            buf = buf[:6].lower()
-            if re.match('[0-9a-f]{6}', buf):
-                kwargs['color_hex'] = buf
         if 'time' not in kwargs:
             kwargs['time'] = timezone.now()
         return super(RootView, self).get_context_data(**kwargs)