dotfiles/overlays/test-exclusions.nix

# Test exclusions for the locally rebuilt x86-64-v3 package set.
#
# Selecting x86-64-v3 changes every affected derivation, so the normal
# nixpkgs binary cache cannot be used and upstream test suites run locally.
# The jeeves builder uses /tmp/nix-builds so filesystem tests run on tmpfs
# instead of ZFS with normalization=formD and utf8only=on; those tests remain
# enabled. The remaining workarounds cover UDP readiness, nested-worker
# scheduling races, and mismatched timeout clocks, plus architecture-dependent
# floating-point differences whose risk we accept for our workloads. Keep these
# exceptions visible until their causes are fixed.
_final: prev: {
  gnutls = prev.gnutls.overrideAttrs (old: {
    # This test uses a fixed four-second sleep instead of checking UDP
    # readiness; the client saw no listener in the x86-64-v3 build.
    postPatch = (old.postPatch or "") + ''
      sed '2iexit 77' -i tests/serv-udp.sh
    '';
  });

  pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [
    (_pythonFinal: pythonPrev: {
      backrefs = pythonPrev.backrefs.overridePythonAttrs (old: {
        # regex measures its timeout in process CPU time, while this test used
        # wall time and could miss the timeout when a busy builder descheduled it.
        postPatch = (old.postPatch or "") + ''
          substituteInPlace tests/test_bregex.py \
            --replace-fail "time.time()" "time.process_time()"
        '';
      });

      pytest-xdist = pythonPrev.pytest-xdist.overridePythonAttrs (old: {
        # The suite exercises its own worker pools. Run the outer suite with one
        # worker and allow inner workers more time on heavily loaded builders.
        postPatch = (old.postPatch or "") + ''
          substituteInPlace testing/test_remote.py \
            --replace-fail "WAIT_TIMEOUT = 10.0" "WAIT_TIMEOUT = 60.0"
        '';
        preCheck = builtins.replaceStrings [ "--numprocesses=$NIX_BUILD_CORES" ] [ "--numprocesses=1" ] (
          old.preCheck or ""
        );
      });

      scipy = pythonPrev.scipy.overridePythonAttrs (old: {
        # x86-64-v3 FFT implementations produce rounding differences outside
        # these tests' strict tolerances. We accept the numerical-precision
        # risk for our workloads.
        disabledTests = (old.disabledTests or [ ]) ++ [
          "test_roundtrip_float32"
          "test_roundtrip_scaling"
        ];
      });
    })
  ];
}