$this->assertTrue(SafeMarkup::isSafe($safe_string));
$string_object = new SafeMarkupTestString('test');
$this->assertFalse(SafeMarkup::isSafe($string_object));
$this->assertTrue(SafeMarkup::isSafe($safe_string));
$string_object = new SafeMarkupTestString('test');
$this->assertFalse(SafeMarkup::isSafe($string_object));