How to use the fetch-mock.lastUrl function in fetch-mock

it('posts given data as contentType=json', async () => {
      fetchMock.mock('https://awesome-stuff.com/api/post-something', {});

      await postJSON('https://awesome-stuff.com/api/post-something', {
        some: 'attributes'
      });

      expect(fetchMock.lastUrl()).toEqual('https://awesome-stuff.com/api/post-something');
      expect(fetchMock.lastOptions()).toEqual(expect.objectContaining({
        method: 'POST',
        headers: {
          'Content-Type': 'application/json'
        },
        body: '{"some":"attributes"}'
      }));
    });

window.addEventListener(
                            'palindrom-before-redirect',
                            handler
                        );

                        fetchMock.mock('/newUrl', {
                            status: 200,
                            body: '{"hello": "world"}'
                        });

                        await palindrom.morphUrl('/newUrl');

                        await sleep();

                        assert.equal(firedEvent.detail.href, '/newUrl');
                        expect(fetchMock.lastUrl()).to.equal('/newUrl');
                        expect(window.location.pathname).to.equal(
                            '/newUrl'
                        );
                    });
                    it('Morphing to a URL should NOT issue a request after a canceled event and morphUrl\'s retuned promise should resolve to `false`', async () => {

makeCallback(done, result => {
          const uri = fetchMock.lastUrl();
          expect(fetchMock.lastUrl()).toBe('/dataFunc');
        }),
      );

.then((res) => {
      expect(res).toMatchSnapshot();
      expect(fetchMock.called(url)).toBeTruthy();
      expect(fetchMock.lastUrl()).toBe(url);
      expect(fetchMock.lastOptions().method).toBe('PATCH');
    });
  });

.then((res) => {
      expect(res).toMatchSnapshot();
      expect(fetchMock.called(url)).toBeTruthy();
      expect(fetchMock.lastUrl()).toBe(url);
      expect(fetchMock.lastOptions().method).toBe('PUT');
    });
  });

makeCallback(done, result => {
          const uri = fetchMock.lastUrl();
          expect(fetchMock.lastUrl()).toBe('/dataFunc');
        }),
      );

.then((res) => {
      expect(res).toMatchSnapshot();
      expect(fetchMock.called(url)).toBeTruthy();
      expect(fetchMock.lastUrl()).toBe(url);
      expect(fetchMock.lastOptions().method).toBe('HEAD');
    });
  });

makeCallback(done, result => {
          const uri = fetchMock.lastUrl();
          expect(uri).toBe('data');
        }),
      );

.then((res) => {
      expect(res).toMatchSnapshot();
      expect(fetchMock.called(url)).toBeTruthy();
      expect(fetchMock.lastUrl()).toBe(url);
      expect(fetchMock.lastOptions().method).toBe('POST');
    });
  });