Error on integration test login function

Only sometimes the integration tests fail on the login method in the beforeAll function, giving error 401 "Unauthorized" or giving error on a foreign key constant. Here is the code.

401 "Unauthorized

Login Function

const login = async (userInfo: any) => {
    return new Promise<string>((resolve, reject) => {
        request(app)
            .post(``${routePath}/sessions``)
            .send(userInfo)
            .expect(200)
            .end((err, res) => {
                if (err) {
                    reject(err)
                }
                resolve(res.header["set-cookie"][0])
            })
    })
}

beforeAll

beforeAll(async () => {
    cleanup()
    await postUser(customer)
    customerCookie = await login(customer)
    await postUser(customer2)
    customerCookie2 = await login(customer2)
    await postUser(customer3)
    customerCookie3 = await login(customer3)
    await postUser(admin)
    adminCookie = await login(admin)

})

Console log

POST /ezelectronics/users 200 110.568 ms - -
POST /ezelectronics/sessions 401 11.962 ms - 48

  ● Cart Integration Tests › GET /carts/all › Correct test cases › Should return an array with all the carts

    expected 200 "OK", got 401 "Unauthorized"

      36 |             .post(``${routePath}/sessions``)
      37 |             .send(userInfo)
    > 38 |             .expect(200)
         |              ^
      39 |             .end((err, res) => {
      40 |                 if (err) {
      41 |                     reject(err)

      at test_integration/car.test.ts:38:14
      at test_integration/car.test.ts:34:12
      at test_integration/car.test.ts:8:71
      at Object.<anonymous>.__awaiter (test_integration/car.test.ts:4:12)
      at login (test_integration/car.test.ts:33:39)
      at test_integration/car.test.ts:51:28
      at fulfilled (test_integration/car.test.ts:5:58)
      ----
      at Test._assertStatus (node_modules/supertest/lib/test.js:252:14)
      at node_modules/supertest/lib/test.js:308:13
      at Test._assertFunction (node_modules/supertest/lib/test.js:285:13)
      at Test.assert (node_modules/supertest/lib/test.js:164:23)
      at Server.localAssert (node_modules/supertest/lib/test.js:120:14)


  ● Test suite failed to run

    TypeError: Cannot read properties of undefined (reading '0')

      41 |                     reject(err)
      42 |                 }
    > 43 |                 resolve(res.header["set-cookie"][0])
         |                                                 ^
      44 |             })
      45 |     })
      46 | }

      at Test.<anonymous> (test_integration/car.test.ts:43:49)
      at Test.assert (node_modules/supertest/lib/test.js:172:8)
      at Server.localAssert (node_modules/supertest/lib/test.js:120:14)

Foreign key constraint

FAIL  test_integration/prod.test.ts

                                                                                                                                                                                                                              
  ● Test suite failed to run

    SQLITE_CONSTRAINT: FOREIGN KEY constraint failed

  ● Test suite failed to run

    SQLITE_CONSTRAINT: FOREIGN KEY constraint failed