测试 ag-grid filterChanged 未被调用

Question

我有自定义 ag-grid 侦听器，用于更改过滤器时，我正在尝试测试在侦听器中调用的方法：

public startListener() {
    this.gridApi.addEventListener('filterChanged', e => {

        if(this.gridId == 'productsGrid') {
            this.updateProducts(e);
        }

        if(this.gridId == 'userGrid') {
            this.updateUser(e);
        }
    });
}

测试：

describe('Listener test', () => {
    it('should call updateProducts', () => {
        let productCall = jest.spyOn(component, 'updateProducts').mockImplementation();

         component.startListener();
         component.gridApi.setFilterModel({test: 'test'});

        expect(productCall).toHaveBeenCalled();
    });

    it('should call updateProducts', () => {
        let userCall = jest.spyOn(component, 'updateUser').mockImplementation();

         component.startListener();
         component.gridApi.setFilterModel({test: 'test'});

        expect(userCall).toHaveBeenCalled();
    });    
});

两个测试都建议预计呼叫次数：0