message: age: Mark `armor_whitespace_outside` test case failure as expected
diff: @@ -399,6 +399,9 @@ fn check_decrypt_error(filename: &str, testfile: TestFile, e: DecryptError) {
  .contains(&filename)
  {
  assert_eq!(testfile.expect, Expect::ArmorFailure);
  + } else if testfile.armored && ["armor_whitespace_outside"].contains(&filename) {
  + // This decryption error is expected, because we do not support parsing
  + // armored files with leading whitespace (due to how we detect armoring).
  } else {
  assert_eq!(testfile.expect, Expect::HeaderFailure);
  }
  