test.js

describe('router interceptor tests', () => {

    describe('if unauthenticated, store to route and go to login route', () => {
      // :shrug: I have no idea why you have to do it like this
      // and only here??
      store.getters = {
        'auth/authenticated': false
      };
      const to = { name: 'blah' };
      let nextObj = {
        next: function () {
          return null;
        }
      };

      const nextSpy = jest.spyOn(nextObj, 'next');
      const dispatchSpy = jest.spyOn(store, 'dispatch');
      interceptor(to, {}, nextObj.next);
      expect(nextSpy).toHaveBeenCalled();
      expect(dispatchSpy).toBeCalledTimes(1);
      expect(dispatchSpy.mock.calls[0]).toEqual([
        "auth/rememberEntryRoute",
        to
      ]);
      expect(nextSpy.mock.calls[0]).toEqual([{ name: 'login' }]);
    });

    describe('if unauthenticated but going to login, just go on', () => {
      store.getters = {
        'auth/authenticated': false
      };
      const to2 = { name: 'login' };
      let nextObj = {
        next: function () {
          return null;
        }
      };
      // const nextSpy = jest.spyOn(nextObj, 'next');
      const dispatchSpy2 = jest.spyOn(store, 'dispatch');
      interceptor(to2, {}, nextObj.next);
      expect(dispatchSpy2).toBeCalledTimes(0);
    });

    // describe('if authenticated, just go on', () => {
    //   null;
    // });

  });

putting console logs in the interceptor function shows that to == { name: 'blah' } in the second test... if I comment out test 1, it works.