    public function testParseTags () {
        $tags = 'test,test2,test3,#test4';
        $this->assertEquals (Tags::parseTags ($tags), array (
            '#test',
            '#test2',
            '#test3',
            '#test4',
        ));
    }
The product receives input or data, but it does
        not validate or incorrectly validates that the input has the
        properties that are required to process the data safely and
        correctly.