Setup System:

1. Use docker-compose to setup the Train-Ticket system.
2. After running the test case once, delete all the contacts in the admin page.


Failure Triggering Usage Steps:

1. Log in and ensure there is at least one contact.
2. Input "Shang Hai" as the starting place and "Nan Jing" as the end place.
3. Randomly select one day between 5 and 30 days from today as the Date.
4. Click [Search].
5. Add one contact, select it and click [Select].
6. Click [Confirm Ticket].
7. You will get error alert and see the exception logs on the server console.


Failure Triggering Test Case:

There is only one test case in ts-ui-test, named [TestFlowOne.java].
Run it and it will preserve ticket successfully once and fail twice.