diff --git a/analytical/tests/__init__.py b/analytical/tests/__init__.py
index 13f7b5f..3c4bca8 100644
--- a/analytical/tests/__init__.py
+++ b/analytical/tests/__init__.py
@@ -18,6 +18,7 @@ from analytical.tests.test_tag_mixpanel import *
 from analytical.tests.test_tag_olark import *
 from analytical.tests.test_tag_optimizely import *
 from analytical.tests.test_tag_performable import *
+from analytical.tests.test_tag_piwik import *
 from analytical.tests.test_tag_reinvigorate import *
 from analytical.tests.test_tag_snapengage import *
 from analytical.tests.test_tag_spring_metrics import *
diff --git a/analytical/tests/test_tag_piwik.py b/analytical/tests/test_tag_piwik.py
new file mode 100644
index 0000000..e06a91c
--- /dev/null
+++ b/analytical/tests/test_tag_piwik.py
@@ -0,0 +1,69 @@
+"""
+Tests for the Piwik template tags and filters.
+"""
+
+from django.http import HttpRequest
+from django.template import Context
+
+from analytical.templatetags.piwik import PiwikNode
+from analytical.tests.utils import TagTestCase, override_settings, \
+    SETTING_DELETED
+from analytical.utils import AnalyticalException
+
+
+@override_settings(PIWIK_DOMAIN_PATH='example.com', PIWIK_SITE_ID='345')
+class PiwikTagTestCase(TagTestCase):
+    """
+    Tests for the ``piwik`` template tag.
+    """
+
+    def test_tag(self):
+        r = self.render_tag('piwik', 'piwik')
+        self.assertTrue(' ? "https" : "http") + "://example.com/";' in r, r)
+        self.assertTrue("_paq.push(['setSiteId', 345]);" in r, r)
+        self.assertTrue('img src="http://example.com/piwik.php?idsite=345"'
+                        in r, r)
+
+    def test_node(self):
+        r = PiwikNode().render(Context({}))
+        self.assertTrue(' ? "https" : "http") + "://example.com/";' in r, r)
+        self.assertTrue("_paq.push(['setSiteId', 345]);" in r, r)
+        self.assertTrue('img src="http://example.com/piwik.php?idsite=345"'
+                        in r, r)
+
+    @override_settings(PIWIK_DOMAIN_PATH='example.com/piwik',
+                       PIWIK_SITE_ID='345')
+    def test_domain_path_valid(self):
+        r = self.render_tag('piwik', 'piwik')
+        self.assertTrue(' ? "https" : "http") + "://example.com/piwik/";' in r,
+                        r)
+
+    @override_settings(PIWIK_DOMAIN_PATH=SETTING_DELETED)
+    def test_no_domain(self):
+        self.assertRaises(AnalyticalException, PiwikNode)
+
+    @override_settings(PIWIK_SITE_ID=SETTING_DELETED)
+    def test_no_siteid(self):
+        self.assertRaises(AnalyticalException, PiwikNode)
+
+    @override_settings(PIWIK_SITE_ID='x')
+    def test_siteid_not_a_number(self):
+        self.assertRaises(AnalyticalException, PiwikNode)
+
+    @override_settings(PIWIK_DOMAIN_PATH='http://www.example.com')
+    def test_domain_protocol_invalid(self):
+        self.assertRaises(AnalyticalException, PiwikNode)
+
+    @override_settings(PIWIK_DOMAIN_PATH='example.com/')
+    def test_domain_slash_invalid(self):
+        self.assertRaises(AnalyticalException, PiwikNode)
+
+    @override_settings(ANALYTICAL_INTERNAL_IPS=['1.1.1.1'])
+    def test_render_internal_ip(self):
+        req = HttpRequest()
+        req.META['REMOTE_ADDR'] = '1.1.1.1'
+        context = Context({'request': req})
+        r = PiwikNode().render(context)
+        self.assertTrue(r.startswith(
+            '<!-- Piwik disabled on internal IP address'), r)
+        self.assertTrue(r.endswith('-->'), r)