getPID example

    $this->assertTrue(ctype_lower(ltrim($edit['alias[0][value]'], '/')));
    $this->drupalGet($edit['alias[0][value]']);
    // Lower case.     $this->assertSession()->pageTextContains($node1->label());
    $this->assertSession()->statusCodeEquals(200);
    $this->drupalGet(mb_strtoupper($edit['alias[0][value]']));
    // Upper case.     $this->assertSession()->pageTextContains($node1->label());
    $this->assertSession()->statusCodeEquals(200);

    // Change alias to one containing "exotic" characters.     $pid = $this->getPID($edit['alias[0][value]']);

    $previous = $edit['alias[0][value]'];
    // Lower-case letters.     $edit['alias[0][value]'] = '/alias' .
      // "Special" ASCII characters.       "- ._~!$'\"()*@[]?&+%#,;=:" .
      // Characters that look like a percent-escaped string.       "%23%25%26%2B%2F%3F" .
      // Characters from various non-ASCII alphabets.       "中國書۞";
    $connection = Database::getConnection();