Streamline test code

THere was a dangling JSON file loaded for no reason

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: pombredanne

tests/test_archive.py

@@ -393,10 +393,7 @@ def test_extract_targz_with_mixed_case_and_symlink(self):
         test_dir = self.get_temp_dir()
         result = archive.extract_tar(test_file, test_dir)
         assert [] == result
-        import json
         exp_file = self.get_test_loc('archive/tgz/mixed_case_and_symlink.tgz.expected.json')
-        with open(exp_file) as ef:
-            expected_files = json.load(ef)
         check_files(test_dir, exp_file, regen=False)
 
     def test_extract_targz_symlinks(self):