diff --git a/tests/json/test_output.py b/tests/json/test_output.py
index 3d0d896..f1fd48b 100644
--- a/tests/json/test_output.py
+++ b/tests/json/test_output.py
@@ -26,7 +26,8 @@ class TestValidJson(unittest.TestCase):
     of runs that didn't succeed.
     """
 
-    def iter_test_files(self):
+    @staticmethod
+    def iter_test_files():
         """ Iterate over all test files in DATA_BASE_DIR """
         for dirpath, _, filenames in os.walk(DATA_BASE_DIR):
             for filename in filenames:
@@ -34,7 +35,6 @@ class TestValidJson(unittest.TestCase):
 
     def run_and_parse(self, program, args, print_output=False, check_return_code=True):
         """ run single program with single file and parse output """
-        return_code = None
         with OutputCapture() as capturer:       # capture stdout
             try:
                 return_code = program(args)
diff --git a/tests/rtfobj/test_is_rtf.py b/tests/rtfobj/test_is_rtf.py
index 43ea40f..ff6f927 100644
--- a/tests/rtfobj/test_is_rtf.py
+++ b/tests/rtfobj/test_is_rtf.py
@@ -60,8 +60,8 @@ class TestIsRtf(unittest.TestCase):
                                  .format(full_path, expect))
                 with open(full_path, 'rb') as handle:
                     self.assertEqual(is_rtf(handle), expect,
-                                    'is_rtf(open({0})) did not return {1}'
-                                    .format(full_path, expect))
+                                     'is_rtf(open({0})) did not return {1}'
+                                     .format(full_path, expect))
 
 
 # just in case somebody calls this file as a script