Worth noting that elses don't require curly braces, which are where most of the visual noise is coming from in your example:

  function check(x) {
    if (!test1 (x))      return false; 
    else if (!test2 (x)) return false;
    else if (!test3 (x)) return false;
    else if (!test4 (x)) return false;
    else                 return true;
  }

I think this is more clear than either of the above