Unit testing – onGridReady – Ag-grid event in Angular

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I am having a function like below in my component file like below

  onGridReady(params) {
    this.gridApi = params.api;
    this.columnApi = params.columnApi;
    this.gridApi.setDomLayout('autoHeight');
    this.gridApi.sizeColumnsToFit();
    params.api.setRowData(this.deviceConfigurations);
  }

For the above function i am writing the spec like the below one

describe('#onGridReady()', () => {
    const params = {
      api: new MockGridApi(),
      ColumnApi: new MockColumnApi(),
    };

    it('call the function', () => {
      spyOn(component, 'onGridReady').and.callThrough();
      component.onGridReady(params);

      expect(component.onGridReady).toHaveBeenCalled();
    });
  });

The spec passes as well as the coverage is done for the above function. But i would like to know whether is it the correct way or writing the spec or do i need to write more specs like to sizeColumnsToFit() has been called etc.,
Could anyone can give your view about it.

Source: Angular Questions