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`. |
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| .. | ||
| atcoder | ||
| codechef | ||
| codeforces | ||
| cses | ||
| kattis | ||
| usaco | ||