--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/tests/test_html.py	Wed Jun 03 21:13:08 2015 -0500
@@ -0,0 +1,68 @@
+"""Tests for the core.html module."""
+import unittest
+
+from core.html import ImageCheckError
+from core.html import image_check
+
+
+TEST_HTML = """
+<p>Posters and Facebook events are starting to come in...</p>
+<p><img src="{src1}" alt="image"></p>
+<p><img src="{src2}" alt="image"></p>
+"""
+
+
+class ImageCheckTestCase(unittest.TestCase):
+    def setUp(self):
+        self.allowed_hosts = ['example.com']
+
+    def test_happy_path(self):
+        url1 = 'https://example.com/1.jpg'
+        url2 = 'https://example.com/2.jpg'
+        html = TEST_HTML.format(src1=url1, src2=url2)
+
+        result = image_check(html, self.allowed_hosts)
+        self.assertTrue(result)
+
+    def test_empty_image(self):
+        url1 = 'https://example.com/1.jpg'
+        url2 = ''
+        html = TEST_HTML.format(src1=url1, src2=url2)
+
+        self.assertRaises(ImageCheckError, image_check, html, self.allowed_hosts)
+
+    def test_relative_ok(self):
+        url1 = 'https://example.com/1.jpg'
+        url2 = '/some/path/2.jpg'
+        html = TEST_HTML.format(src1=url1, src2=url2)
+
+        result = image_check(html, self.allowed_hosts)
+        self.assertTrue(result)
+
+    def test_non_https(self):
+        url1 = 'http://example.com/1.jpg'
+        url2 = 'https://example.com/2.jpg'
+        html = TEST_HTML.format(src1=url1, src2=url2)
+
+        self.assertRaises(ImageCheckError, image_check, html, self.allowed_hosts)
+
+    def test_missing_hostname(self):
+        url1 = 'http:///1.jpg'
+        url2 = 'https://example.com/2.jpg'
+        html = TEST_HTML.format(src1=url1, src2=url2)
+
+        self.assertRaises(ImageCheckError, image_check, html, self.allowed_hosts)
+
+    def test_hostname_not_allowed1(self):
+        url1 = 'https://xxx.example.com/1.jpg'
+        url2 = 'https://example.com/2.jpg'
+        html = TEST_HTML.format(src1=url1, src2=url2)
+
+        self.assertRaises(ImageCheckError, image_check, html, self.allowed_hosts)
+
+    def test_hostname_not_allowed2(self):
+        url1 = 'https://xxx.example.com/1.jpg'
+        url2 = 'https://yyy.example.com/2.jpg'
+        html = TEST_HTML.format(src1=url1, src2=url2)
+
+        self.assertRaises(ImageCheckError, image_check, html, self.allowed_hosts)