public function testIsCensoring()
 {
     $string = new String('Lorem ipsum dolor');
     $result = $string->censor('ipsum');
     $this->assertInstanceOf('Simple\\Type\\String', $result);
     $this->assertEquals('Lorem ***** dolor', $result->toString());
     $string = new String('Lorem ipsum dolor');
     $result = $string->censor(array('Lorem', 'dolor'));
     $this->assertInstanceOf('Simple\\Type\\String', $result);
     $this->assertEquals('***** ipsum *****', $result->toString());
 }