structMultiDimensionalView(model, model.bounds);
    const values = getNodeValues_(root, path);

    assert.closeTo(getCpuUsage_(values), (250 + 400) / 990, 1e-7);
    assert.closeTo(getCpuTotal_(values), 250 + 400, 1e-7);
  });

  /**
   * Returns a model spec where the browser process has a main thread and an IO
   * thread.
   *
   * This is a function instead of just a variable because the test functions
   * are meant to modify this modelSpec and insert suitable expectations.
   *
   * The browser main