Method addOption

src/cdk/testing/component-harness.ts:666–671

* Adds a predicate function that depends on an option value to be run against candidate * harnesses. If the option value is undefined, the predicate will be ignored. * @param name The name of the option (may be used in error messages). * @param option The option value. * @param predicate

(name: string, option: O | undefined, predicate: AsyncOptionPredicate<T, O>)

   * @return this (for method chaining).
   */
  addOption<O>(name: string, option: O | undefined, predicate: AsyncOptionPredicate<T, O>) {
    if (option !== undefined) {
      this.add(`${name} = ${_valueAsString(option)}`, item => predicate(item, option));
    }
    return this;
  }

  /**
   * Filters a list of harnesses on this predicate.