[paulmueller-agent]

The Windows test job looked like it was hanging in tests/test_gui.py. With --durations=20 (#123), the last main run (job 126803257463) shows the cause:

1208.83s call     tests/test_gui.py::test_gui_start_with_bad_server

The same test takes 45 s on Linux. During startup and shutdown DCOR-Aid resolves the non-existent host WRONG-dcor-dev.mpl.mpg.de 31 times (each requests call: 1 try + 3 connect retries). The 45 s on Linux are the retry back-off; on Windows each failed lookup adds about 37 s.

Change

• tests/common.py: new context manager fail_name_resolution(host_part) that lets socket.getaddrinfo raise socket.gaierror immediately for matching hosts
• tests/test_gui.py: use it in test_gui_start_with_bad_server; the test still checks that DCOR-Aid starts offline

test_cli_fail_wrong_server_httperror (90 s) is left as it is: it takes 90 s on Linux too (retry back-off), and its host *.does.not.exist.example.com does not resolve slowly on Windows.

Testing
test_gui_start_with_bad_server passes locally on Linux (45 s, as before). The Windows timing can only be verified by CI on main.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.77%. Comparing base (3660a9c) to head (28efc73).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
+ Coverage   72.70%   72.77%   +0.06%     
==========================================
  Files          72       72              
  Lines        6057     6057              
==========================================
+ Hits         4404     4408       +4     
+ Misses       1653     1649       -4     

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