code: function (jqSelector) {
        // Make selector human readable.
        var selectorDesc = jqSelector.replace(/:/g, "");
  
        // Return decorated assert.
        return _jqAssert(function () {
          /*eslint-disable no-invalid-this*/
          this.assert(
            this._$el.is(jqSelector),
            "expected " + this._name + " to be " + selectorDesc,
            "expected " + this._name + " to not be " + selectorDesc
          );
        });
      }
docs: /*!
  Base for the boolean is("selector") method call.
  
  @see http://api.jquery.com/is/]
  
  @param {String} selector jQuery selector to match against