Jasmine AG Grid Test case failed

Am trying to write a test for ag grid export method. Here is the component changes

export class GridComponent extendsimplements OnInit {

  gridApi: any;

  onGridDataExport(): void {
    this.gridApi.exportDataAsCsv();
  }
}

grid component spec file

fdescribe('when onGridDataExport method call', () => {
    it('should call gridApi', () => {
      const result = spyOn(component.gridApi, 'exportDataAsCsv');
      component.onGridDataExport();
      expect(result).toHaveBeenCalled();
    });

  });

when i run the test cases it show the below error enter image description here

How can i resolve this issue?

expecting a valid solution.

Thanks in advance

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