message: Fix TestHost Root Promise
diff: @@ -150,9 +150,8 @@ export class TestHost {
  }
  public readonly deltaConnectionServer: ILocalDeltaConnectionServer;
  - private rootResolver: (accept: TestRootComponent) => void;
  - private readonly root = new Promise<TestRootComponent>((accept) => { this.rootResolver = accept; });
  + private readonly root: Promise<TestRootComponent>;
  /**
  * @param componentRegistry - array of key-value pairs of components available to the host
  @@ -194,9 +193,7 @@ export class TestHost {
  new TestDocumentServiceFactory(this.deltaConnectionServer),
  new TestResolver());
  - store.open<TestRootComponent>("test-root-component", TestRootComponent.codeProposal, "", scope)
  - .then(this.rootResolver)
  - .catch((reason) => { throw new Error(`${reason}`); });
  + this.root = store.open<TestRootComponent>("test-root-component", TestRootComponent.codeProposal, "", scope);
  }
  /**
  