Fix DeprecationWarning in unittests (dropped in python 3)

Author: EvaSDK

tests/test_handler.py

@@ -42,5 +42,5 @@ def test_simple(self):
         eq('app.follow', data[0][0])
         eq('userA', data[0][2]['from'])
         eq('userB', data[0][2]['to'])
-        self.assert_(data[0][1])
-        self.assert_(isinstance(data[0][1], int))
+        self.assertTrue(data[0][1])
+        self.assertTrue(isinstance(data[0][1], int))

tests/test_sender.py

@@ -32,5 +32,5 @@ def test_simple(self):
         eq(3, len(data[0]))
         eq('test.foo', data[0][0])
         eq({'bar': 'baz'}, data[0][2])
-        self.assert_(data[0][1])
-        self.assert_(isinstance(data[0][1], int))
+        self.assertTrue(data[0][1])
+        self.assertTrue(isinstance(data[0][1], int))