Jasmine matchers

matchers.js

  var matchers = {
      toBePromise: function(util){
          return {
              compare: function(actual){
                  var result = {}
                  result.pass = typeof actual === "object" && typeof actual.then === "function";

                  if(result.pass){
                      result.message = "Expected var not be a Promise";
                  }
                  else{
                      result.message = 'Expected var to be a Promise';
                  }
                  return result;
              }
          };
      }
  };
  jasmine.addMatchers(matchers);