constructor(subject, id=undefined, info=undefined) {
        sanityCheck(subject);
        assertionSubjectIndexForNextTest += 1;

        /**
         * The "actual" value, to be compared against expected values.
         * @type {*}
         */
        this.subject = subject;
        /**
         * @type {*}
         */
        this.id = id;
        /**
         * @type {*}
         */
        this.info = info;
    }
@param {*} subject
@param {*} id
@param {*} info
@property {*} subject