constructor(path) {
        this.path = path || new j$.ObjectPath([]);
        this.formatter = undefined;
        this.children = [];
        this.isMismatch = false;
      }
Returns a string representation of this tester to use in matcher failure messages
@function
@name AsymmetricEqualityTester#jasmineToString
@param pp {function} Function that takes a value and returns a pretty-printed representation
@return {String}