added tearDown() for cleanup application files

src/tests/common.py

@@ -13,7 +13,10 @@ _files = (
 def cleanup(home=None, files=_files):
     """Cleanup application files"""
     if not home:
+        try:
             import state
+        except ImportError:
+            from pybitmessage import state
         home = state.appdata
     for pfile in files:
         try:

src/tests/test_protocol.py

@@ -3,11 +3,18 @@ Tests for common protocol functions
 """
 
 import unittest
+try:
+    from .common import cleanup
+except ImportError:
+    from common import cleanup
 
 
 class TestProtocol(unittest.TestCase):
     """Main protocol test case"""
 
+    def tearDown(self):
+        cleanup()
+
     def test_check_local(self):
         """Check the logic of TCPConnection.local"""
         from pybitmessage import protocol, state