How to meet a statement with match MediaQuery && contains classList

I am trying to make this if statement work to meet the requirement of meeting the mediaQuery AND checking if the body contains a specific className. But it results in defaulting to the else statement, "Lower than 799px". How can I make this if statement work?...Cheers!

    const mediaQueryList = window.matchMedia('(min-width: 50em)')

    function() {
     //do stuff
    }

    function handleDeviceChange(e) {
      if (e.matches && document.body.classList.contains('className') {
        console.log('Media Query above 800px')
        function();
      } else {
        console.log('Media Query: lower then 799px')
      }
    }
    mediaQueryList.addEventListener('change', handleDeviceChange);
    handleDeviceChange(mediaQueryList);