enforce closing the file

Signed-off-by: Javan Lacerda <[email protected]>

Author: javanlacerda

src/clusterfuzz/_internal/tests/core/bot/fuzzers/centipede/centipede_engine_test.py

@@ -402,6 +402,7 @@ def test_minimize_corpus(self):
     crasher = os.path.join(crash_corpus, os.listdir(crash_corpus)[0])
     with open(crasher) as crasher_file:
       crash_content = crasher_file.read()
+      crasher_file.close()
     self.assertEqual(crash_content, '?f???u???z?')
 
   def test_minimize_testcase(self):