code: function(){
      var i = 0, len = SinonExpect.assertions.length,
          matcher;
  
      for(i, len; i < len; i++){
        matcher = SinonExpect.assertions[i];
        (function(matcher){
          SinonExpect.SinonAssertions.prototype[matcher] = function(){
            var args = Array.prototype.slice.call(arguments),
                sinon = SinonExpect._sinon;
  
            args.unshift(this.obj);
  
            sinon.assert[matcher].apply(
              sinon.assert,
              args
            );
          };
        }(matcher));
      }
    }
docs: Creates sinon matchers on the SinonExpect.SinonAssertions prototype.
  This could also be done on including the file but I prefer
  keeping it in a method.
  
  @private