add model-based test for data entry

[jschuurk-kr]

Scope

• add model-based test for data entry
• make the test check that the events and states in the machine match the events and states in the test

Questions

It would be nice to only check once that the events and states in the machine match the events and states in the test. However, the events and states in the test require the Playwright fixtures page, pollingStation, election. So I don't think there's a way to do this. If you know of a solution, please share!

I made the model-based tests part of the e2e tests. So this PR adds 3 x 23 tests to the e2e tests. Part of issue #898 Change PollingStation.test.tsx to Playwright tests is to check the coverage of the e2e tests, because I think there currently is some overlap between the existing e2e tests, the model-based tests in this PR, and the tests in PollingStation.test.tsx.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.80%. Comparing base (8946e1b) to head (7be330f).
Report is 4 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #949   +/-   ##
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  Coverage   89.80%   89.80%           
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  Files         238      238           
  Lines       12561    12561           
  Branches     1281     1281           
=======================================
  Hits        11281    11281           
  Misses       1191     1191           
  Partials       89       89           

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[github-actions]

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[cikzh]

Looks good! I understand what's going on and I verified that the tests are actually run. I've sampled some tests through the Playwright UI to see that the tests are sane.
I'm experiencing some flakiness testing locally, but I'm convinced that this is unrelated to this PR

[jschuurk-kr]

On Wednesday 5 Feb after standup @oliver3 and I will discuss if there's a way to check only once there's code for all events and steps in the state machine.

[praseodym]

@jschuurk-kr this branch has a merge conflict, could you resolve that? lgtm otherwise