/**
  * @covers Patchwork\Utf8::str_shuffle
  */
 function testStr_shuffle()
 {
     $c = "déjà 한국어";
     $c .= n::normalize($c, n::NFD);
     $this->assertTrue($c != ($d = u::str_shuffle($c)) || $c != ($d = u::str_shuffle($c)));
     $this->assertSame(strlen($c), strlen($d));
     $this->assertSame(u::strlen($c), u::strlen($d));
     $this->assertSame('', u::trim($d, $c));
 }