Testing/utils (#548)

* New unittest for utils.py

Unit test fetch in basic ways. Would have tested more fetches, but
downloading stuff for tests is annoying and mocking is more
dependencies.

* Remove unused imports

test/test_utils.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+import unittest
+from extra.utils import fetch
+
+class TestUtils(unittest.TestCase):  
+  def test_fetch_bad_http(self):
+    self.assertRaises(AssertionError, fetch, 'http://httpstat.us/500')
+    self.assertRaises(AssertionError, fetch, 'http://httpstat.us/404')
+    self.assertRaises(AssertionError, fetch, 'http://httpstat.us/400')
+  
+  def test_fetch_small(self):
+    assert(len(fetch('https://google.com'))>0)
+
+if __name__ == '__main__':
+  unittest.main()