Method getHarnessOrNull

src/cdk/testing/component-harness.ts:120–120

* Searches for an instance of the component corresponding to the given harness type under the * `HarnessLoader`'s root element, and returns a `ComponentHarness` for that instance. If multiple * matching components are found, a harness for the first one is returned. If no matching * componen

(query: HarnessQuery<T>)

   * @return An instance of the given harness type (or null if not found).
   */
  getHarnessOrNull<T extends ComponentHarness>(query: HarnessQuery<T>): Promise<T | null>;

  /**
   * Searches for an instance of the component corresponding to the given harness type under the