Method add

src/cdk/testing/component-harness.ts:652–656

* Adds a predicate function to be run against candidate harnesses. * @param description A description of this predicate that may be used in error messages. * @param predicate An async predicate function. * @return this (for method chaining).

(description: string, predicate: AsyncPredicate<T>)

   * @return this (for method chaining).
   */
  add(description: string, predicate: AsyncPredicate<T>) {
    this._descriptions.push(description);
    this._predicates.push(predicate);
    return this;
  }

  /**
   * Adds a predicate function that depends on an option value to be run against candidate