YXRoXTwvc3Bhbj48c2NyaXB0IHR5cGU9Im1hdGgvdGV4Ij5jID0gMzA8L3NjcmlwdD4uCgo8UD4=
 " base64 = "1" >Hint: </a> bar';
        $expected = 'foo  bar';
        $pf = new \WeBWorK\Server\Util\ProblemFormatter();
        $this->assertSame($expected, $pf->strip_knowls($text));
    }
    public function test_convert_anchors()