added a section for assertions, and a simple assertEqual snippet

Author: hxegon

Diff for: snippets/python.snippets

@@ -140,6 +140,9 @@ snippet "
 	"""
 	${0:doc}
 	"""
+# assertions
+snippet a=
+	self.assertEqual(${0}, ${1})
 # test function/method
 snippet test
 	def test_${1:description}(${2:`indent('.') ? 'self' : ''`}):