How to use the frisby.del function in frisby

.then(function (res) {
                  // We've POSTed a packet. Now try to delete it. Get the location
                  // out of the returned header
                  const packet_link = res.headers.get('location');
                  // Check its value
                  expect(packet_link).toEqual(packets_url + '/' + timestamp(0));
                  // Now delete it.
                  return frisby.del(packet_link)
                               .expect('status', 204)
                               .then(function (res) {
                                   // Make sure it's truly deleted. This also tests getting a non-existent packet
                                   return frisby.get(packet_link)
                                                .expect('status', 404);
                               });
              })
              .done(doneFn);

it('DELETE existing recycle is forbidden', () => {
    return frisby.del(API_URL + '/Recycles/1', { headers: authHeader })
      .expect('status', 401)
  })
})

it('DELETE existing privacy request is forbidden', () => {
    return frisby.del(API_URL + '/PrivacyRequests/1', { headers: authHeader })
      .expect('status', 401)
  })
})

it('DELETE existing product is forbidden via public API', () => {
    return frisby.del(API_URL + '/Products/1')
      .expect('status', 401)
  })

it('DELETE existing security question is forbidden via public API even when authenticated', () => {
    return frisby.del(API_URL + '/SecurityQuestions/1', { headers: authHeader })
      .expect('status', 401)
  })
})

it('DELETE existing complaint is forbidden', () => {
    return frisby.del(API_URL + '/Complaints/1', { headers: authHeader })
      .expect('status', 401)
  })
})

it('DELETE existing feedback is forbidden via public API', function (done) {
    frisby.del(API_URL + '/Feedbacks/1')
      .expect('status', 401)
      .done(done)
  })

it('DELETE existing challenge is forbidden via public API even when authenticated', () => {
    return frisby.del(API_URL + '/Challenges/1', { headers: authHeader })
      .expect('status', 401)
  })
})

.then(({ json }) => {
        return frisby.del(API_URL + '/BasketItems/' + json.data.id, { headers: authHeader })
          .expect('status', 200)
      })
  })

it("should delete a measurement", function (doneFn) {
        frisby.del(measurement_url)
              .expect('status', 204)
              .then(function () {
                  frisby.get(measurement_url)
                        .expect('status', 404);
              })
              .done(doneFn);
    });
});