How to use the @angular-devkit/architect/testing.TestingArchitectHost function in @angular-devkit/architect

export async function getTestArchitect() {
  const architectHost = new TestingArchitectHost('/root', '/root');
  const registry = new schema.CoreSchemaRegistry();
  registry.addPostTransform(schema.transforms.addUndefinedDefaults);

  const architect = new Architect(architectHost, registry);

  await architectHost.addBuilderFromPackage(join(__dirname, '../..'));

  return [architect, architectHost] as [Architect, TestingArchitectHost];
}

export async function getTestArchitect() {
  const architectHost = new TestingArchitectHost('/root', '/root');
  const registry = new schema.CoreSchemaRegistry();
  registry.addPostTransform(schema.transforms.addUndefinedDefaults);

  const architect = new Architect(architectHost, registry);

  await architectHost.addBuilderFromPackage(join(__dirname, '../..'));

  return [architect, architectHost] as [Architect, TestingArchitectHost];
}

export async function getTestArchitect() {
  const architectHost = new TestingArchitectHost('/root', '/root');
  const registry = new schema.CoreSchemaRegistry();
  registry.addPostTransform(schema.transforms.addUndefinedDefaults);

  const architect = new Architect(architectHost, registry);

  await architectHost.addBuilderFromPackage(join(__dirname, '../..'));

  return [architect, architectHost] as [Architect, TestingArchitectHost];
}

export async function getTestArchitect() {
  const tmpDir = getTempDir();
  const architectHost = new TestingArchitectHost(tmpDir, tmpDir);
  const registry = new schema.CoreSchemaRegistry();
  registry.addPostTransform(schema.transforms.addUndefinedDefaults);

  const architect = new Architect(architectHost, registry);

  await architectHost.addBuilderFromPackage(join(__dirname, '../..'));

  return [architect, architectHost] as [Architect, TestingArchitectHost];
}

async function createArchitect(workspaceRoot: string) {
    vfHost = new NodeJsSyncHost();

    const registry = new schema.CoreSchemaRegistry();
    registry.addPostTransform(schema.transforms.addUndefinedDefaults);

    const { workspace } = await workspaces.readWorkspace(
      workspaceRoot,
      workspaces.createWorkspaceHost(vfHost),
    );

    testArchitectHost = new TestingArchitectHost(workspaceRoot, workspaceRoot,
      new WorkspaceNodeModulesArchitectHost(workspace, workspaceRoot));
    architect = new Architect(testArchitectHost, registry);
  }

async function createArchitect(workspaceRoot: string) {
    vfHost = new NodeJsSyncHost();

    const registry = new schema.CoreSchemaRegistry();
    registry.addPostTransform(schema.transforms.addUndefinedDefaults);

    const { workspace } = await workspaces.readWorkspace(
      workspaceRoot,
      workspaces.createWorkspaceHost(vfHost),
    );

    testArchitectHost = new TestingArchitectHost(workspaceRoot, workspaceRoot,
      new WorkspaceNodeModulesArchitectHost(workspace, workspaceRoot));
    architect = new Architect(testArchitectHost, registry);
  }

beforeEach(async () => {
    const registry = new schema.CoreSchemaRegistry();
    registry.addPostTransform(schema.transforms.addUndefinedDefaults);
    const testArchitectHost = new TestingArchitectHost('/root', '/root');

    architect = new Architect(testArchitectHost, registry);
    await testArchitectHost.addBuilderFromPackage(
      path.join(__dirname, '../../..')
    );

    (devkitArchitect as any).scheduleTargetAndForget = jest
      .fn()
      .mockReturnValue(
        of({
          success: true,
          baseUrl: 'http://localhost:4200'
        })
      );
    fakeEventEmitter = new EventEmitter();
    fork = spyOn(child_process, 'fork').and.returnValue(fakeEventEmitter);

beforeEach(async () => {
    await host.initialize().toPromise();

    const registry = new schema.CoreSchemaRegistry();
    registry.addPostTransform(schema.transforms.addUndefinedDefaults);

    const workspaceSysPath = getSystemPath(host.root());
    const { workspace } = await workspaces.readWorkspace(
      workspaceSysPath,
      workspaces.createWorkspaceHost(host),
    );
    const architectHost = new TestingArchitectHost(
      workspaceSysPath,
      workspaceSysPath,
      new WorkspaceNodeModulesArchitectHost(workspace, workspaceSysPath),
    );

    architect = new Architect(architectHost, registry);
  });