Cleanup .spider extension registered by test code during save

Author: radarhere

Tests/test_file_spider.py

@@ -14,6 +14,10 @@
 TEST_FILE = "Tests/images/hopper.spider"
 
 
+def teardown_module() -> None:
+    del Image.EXTENSION[".spider"]
+
+
 def test_sanity() -> None:
     with Image.open(TEST_FILE) as im:
         im.load()