refactor: broken directory existence check due to missing me (#2615)

The code checks `content.is_dir` instead of calling `content.is_dir()`. Since bound method objects are always truthy, the assertion never validates extraction output and can mask packaging/extraction failures.

Affected files: tox_sdist.py

Signed-off-by: tuanaiseo <221258316+tuanaiseo@users.noreply.github.com>

Author: tuanaiseo

tools/tox_sdist.py

@@ -31,7 +31,7 @@ def extract_sdist(archive, target):
         targz.extractall(target)
 
     content = target / archive.with_suffix('').stem
-    assert content.is_dir, 'no extracted directory found, something is wrong!'
+    assert content.is_dir(), 'no extracted directory found, something is wrong!'
     logging.info(f'Extracted {archive} to {content}.')
     return content