fix: mark xfail test_groundedness_e2e_string_documents

[akihikokuroda]

Pull Request

Issue

Description

Work around test failure. Mark xfail a test failing caused by citation response differences between CPU and GPU.

Testing

• Tests added to the respective file if code was changed
• New code has 100% coverage if code was added
• Ensure existing tests and github automation passes (a maintainer will kick off the github automation when the rest of the PR is populated)

Attribution

• AI coding assistants used

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[planetf1]

One suggestion I can't anchor to the diff: the sibling test test_groundedness_e2e_complex_response just above uses assert isinstance(result.as_bool(), bool) precisely because grounding verdicts are hardware-dependent. If this test is primarily checking that string documents are accepted as input rather than pinning a specific verdict, the same looser assertion would make it deterministic without needing xfail at all.

[planetf1]

Wondering if this swap is intentional — @require_gpu(min_vram_gb=8) and @pytest.mark.xfail do quite different things. require_gpu is a skip gate; on a CPU-only runner it returns skipif(True, ...) so the test never executes, which is what all eight sibling tests in this file do. xfail is a result modifier — the test still runs, it just tolerates a failure. After this change this becomes the only test in the file that will load ibm-granite/granite-4.0-micro and run inference on a CPU-only runner.

Suggest keeping both. Worth filing an issue for the CPU/GPU divergence and linking it in the reason too — bare xfails without an issue reference tend to get missed in test-health sweeps:

Suggested change

	@pytest.mark.xfail(reason="CPU/GPU response differences")
	@require_gpu(min_vram_gb=8)
	@pytest.mark.xfail(strict=False, reason="CPU/GPU citation response differences — see #NNNN")

[akihikokuroda]

This requirement processes the citation response in detail. It can not loosen the condition. I restored require_gpu as suggested.