Update test_B7_persist_temp_file

Add a test case for file permissions

Signed-off-by: Teodora Sechkova <tsechkova@vmware.com>

tests/test_util.py

@@ -191,8 +191,16 @@ def test_B7_persist_temp_file(self):
  dest_path = os.path.join(dest_temp_dir, self.random_string())
  tmpfile = tempfile.TemporaryFile()
  tmpfile.write(self.random_string().encode('utf-8'))
- securesystemslib.util.persist_temp_file(tmpfile, dest_path)
+ # Write a file with a custom umask
+ securesystemslib.util.persist_temp_file(tmpfile, dest_path, 0o177)
  self.assertTrue(dest_path)
+ # Test if file permissions are as expected
+ # permissions = default mode (0o777) - umask
+ expected_perm = '600'
+ if os.name != 'posix':
+ # Windows only supports setting the read-only attribute.
+ expected_perm = '666'
+ self.assertEqual(oct(os.stat(dest_path).st_mode)[-3:], expected_perm)