Add a forgotten test module, test_sys_path.py and fix Python2/3 compatibility issues.

test/test_evaluate/test_helpers.py

@@ -13,7 +13,7 @@ def test_deep_ast_copy():
 
 def test_statement_elements_in_statement():
     def get_stmt_els(string):
-        p = Parser(string)
+        p = Parser(unicode(string))
         return helpers.statement_elements_in_statement(p.module.statements[0])
 
     # list comprehension