text: describe('Unit: ExampleFilter', function() {
  
    let $filter;
  
    beforeEach(function() {
      // instantiate the app module
      angular.mock.module('app');
  
      // mock the filter
      angular.mock.inject((_$filter_) => {
        $filter = _$filter_;
      });
    });
  
    it('should replace the word "keyboard" with "leopard"', function() {
      const testString = 'computers are operated by keyboards';
      const resultString = $filter('ExampleFilter')(testString);
  
      expect(resultString).toEqual('computers are operated by leopards');
    });
  
  });