test: add offline fixture coverage for Kattis and USACO

Problem: Kattis and USACO had zero offline test coverage — no fixtures,
no conftest routers, and no entries in the test matrix. Precision, error
cases, and the Kattis contest-vs-slug fallback were also untested.

Solution: Add HTML fixtures for both platforms covering metadata, tests,
and contest list modes. Wire up conftest routers that patch
`httpx.AsyncClient.get` using the same pattern as CSES/CodeChef. Extend
the test matrix to include Kattis and USACO (18 parametrized cases, up
from 12). Add a dedicated test for the Kattis contest-path (verifies
`contest_url`/`standings_url` are set). Add parametrized metadata error
tests for CSES, USACO, and Kattis. Assert `precision` field type in all
tests-mode payloads; `usaco/problem_1471.html` includes an absolute-error
hint to exercise `extract_precision`.
This commit is contained in:
Barrett Ruth 2026-03-06 16:46:03 -05:00
parent 9727dccc6f
commit 37ad92432e
Signed by: barrett
GPG key ID: A6C96C9349D2FC81
12 changed files with 207 additions and 1 deletions

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<html><body>
<p>Time limit: 4s. Memory limit: 256 MB.</p>
<p>Output the answer with absolute error at most 10^{-6}.</p>
<pre class="in">2
1 2</pre>
<pre class="out">1.500000</pre>
</body></html>