Issue #2911379 by Spokje, ProFire, mstrelan: Unneccessary bitwise operation...

  protected function assertFilePermissions(int $expected_mode, string $uri, string $message = ''): void {

    // Mask out all but the last three octets.

    $actual_mode = fileperms($uri) & 0777;

    // PHP on Windows has limited support for file permissions. Usually each of

    // "user", "group" and "other" use one octal digit (3 bits) to represent the

    // read/write/execute bits. On Windows, chmod() ignores the "group" and

    // "other" bits, and fileperms() returns the "user" bits in all three

    // positions. $expected_mode is updated to reflect this.

    if (substr(PHP_OS, 0, 3) == 'WIN') {

      // Reset the "group" and "other" bits.

      $expected_mode = $expected_mode & 0700;

      // Shift the "user" bits to the "group" and "other" positions also.

      $expected_mode = $expected_mode | $expected_mode >> 3 | $expected_mode >> 6;

    }

    $this->assertSame($expected_mode, $actual_mode, $message);

  }