add testcase for vim modeline

tests/samples/codefiles/python_without_extension

@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+# vim: set filetype=python
+
+
+import os, sys
+import django
+from app import *
+from flask import session
+import simplejson as json
+from . import privatemodule
+from jinja import tags
+from pygments.lexers import BaseLexer
+from . import LocalClass
+from . import MyClass as MyParser
+from ..compat import u
+from sqlalchemy import (
+    functions as sqlfunctions,
+    orm as sqlorm,
+)
+
+try:
+    from mock import ANY
+except ImportError:
+    from unittest.mock import ANY
+
+
+class MyClass(object):
+    """this class
+    """
+
+    def method1(self):
+        a = 1 + 2
+        b = 'hello world!'
+        for x in y:
+            print(x)
+        raise Exception()