public function string_safestring_equality_test()
 {
     $safe_string = new SafeString("hello <p>world</p>");
     $this->assert_equal("hello <p>world</p>", $safe_string->unescaped());
     $escaped_string = "hello &lt;p&gt;world&lt;/p&gt;";
     $this->assert_equal($escaped_string, $safe_string);
     $this->assert_true($escaped_string == $safe_string);
     $this->assert_false($escaped_string === $safe_string);
     $this->assert_false("meow" == $safe_string);
 }