fix(#44): pytest passes out of the box — guard optional-dep tests

[fmasi]

Summary

A fresh clone running the documented pytest tests/ hit 2 collection errors (Azure) that aborted the whole run, plus provider-test failures — all from optional dependencies, not bugs. "Clone → pytest → red" is a poor first impression for a public repo.

• src/data/loader.py — lazy-import AzureBlobEmailLoader inside the azure_blob branch (it was a top-level import pulling the optional azure-storage-blob). Now from src.data.loader import load_emails works without Azure; the enron / mail_archive_x paths need none. This keeps test_load_emails running on minimal envs (vs. skipping it).
• tests/test_azure_blob_loader.py — pytest.importorskip("azure.storage.blob").
• tests/test_settings_embedding_provider.py — pytest.importorskip("llama_index.embeddings.openai").

(The NVIDIA and Office-parser optional tests were already guarded in earlier PRs.)

Verification

• Full env: 882 pass.
• Minimal env (Azure + cloud embeddings + NVIDIA + Pinecone blocked): 865 pass / 5 skip / 0 errors — clone → pytest → green.

Closes #44.

🤖 Generated with Claude Code

[claude]

The azure_blob branch of load_emails isn't covered in test_load_emails.py. The other three branches (enron, mail_archive_x, invalid source) all have cases there, but this one doesn't.

A test can avoid the real Azure SDK by patching with create=True — no pytest.importorskip needed:

@patch("src.data.loaders.azure_blob.AzureBlobEmailLoader", create=True)
def test_load_emails_azure_blob_source(self, MockLoader):
    mock_loader = MagicMock()
    mock_loader.load.return_value = []
    MockLoader.return_value = mock_loader

    docs = load_emails(source="azure_blob")

    MockLoader.assert_called_once()
    mock_loader.load.assert_called_once_with(num_samples=None)
    self.assertEqual(docs, [])

Per the repo rule: modified logic → tests for happy path, edge cases, and invalid inputs.

[fmasi]

✅ Good catch — added test_load_emails_azure_blob_source in 7e7e350 covering the dispatch (constructs the loader, calls load(num_samples=...), maps to Documents).

One adjustment to your suggestion: I kept a per-test pytest.importorskip("azure.storage.blob") rather than relying on create=True alone. The reason is the lazy __getattr__ in src/data/loaders/__init__.py: load_emails resolves from src.data.loaders import AzureBlobEmailLoader at call time, and mock.patch saving the original attribute still triggers that getattr → imports azure_blob → azure.storage.blob. So an unguarded patch would re-introduce a minimal-env import error — the exact thing #44 fixes. Verified both ways: passes with Azure installed, skips cleanly when it's blocked. Module-level importorskip wasn't an option either (the enron / mail_archive_x tests in this file must still run without Azure).

[claude]

Review: fix(#44) — pytest passes out of the box

Overall: Clean, minimal, correctly scoped. The three-file change does exactly what it says. One test-coverage gap to address; no correctness or security issues.

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What's correct

• Lazy import in loader.py — moving AzureBlobEmailLoader inside the elif source == "azure_blob": branch is the right fix. The loaders/__init__.py already uses __getattr__ for deferred loading, so from src.data.loaders import AzureBlobEmailLoader inside the function resolves cleanly through that same mechanism.
• pytest.importorskip placement — both guards are at module level, before any import that would fail at collection time. Correct placement; azure.storage.blob guard prevents the AzureBlobEmailLoader import from erroring out, and the llama_index.embeddings.openai guard prevents the @patch decorators from raising at test execution.
• # noqa: PLC0415 — appropriate; lint suppression is scoped to the one non-top-level import that's intentionally deferred.

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One gap

Missing test for the azure_blob path in test_load_emails.py (see inline comment on loader.py line 42).

test_load_emails.py covers enron, mail_archive_x, missing-backup_dir, and invalid source — but not azure_blob. The new lazy-import branch is only indirectly exercised by test_azure_blob_loader.py (which tests the loader class itself, not the load_emails dispatch). Per the repo rule, modified logic needs its own test; a create=True patch makes it runnable without the real Azure SDK.

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Minor note (no action needed)

The comment in test_settings_embedding_provider.py — "must be importable to patch it" — is accurate: unittest.mock.patch does import the target module at application time, so the test would raise (not skip) on a missing dep without the guard. No change needed.

[claude]

The lazy import and __getattr__ interaction here is correct. Minor follow-up: the source param in the docstring just above (line 28) still reads "enron" or "mail_archive_x" — "azure_blob" should be added now that it has test coverage. CLAUDE.md requires docstrings to be updated when behaviour is touched.

[fmasi]

✅ Fixed — the docstring now reads "enron", "mail_archive_x", or "azure_blob". Followed up in a separate docstring-only PR since #58 was already merged.

[claude]

Review summary

Goal: make pytest tests/ pass on a minimal install by lazy-importing the Azure SDK and guarding the optional-dep tests. The approach is sound and the verification numbers (882 pass full / 865 pass + 5 skip minimal) are reassuring.

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Correctness — one nit

load_emails docstring (loader.py:28) omits "azure_blob".
The source parameter description says "enron" or "mail_archive_x". Now that azure_blob has test coverage, the docstring should list it too. Flagged inline on the nearest diff line.

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Lazy-import + __getattr__ interaction — correct

The loaders/__init__.py __getattr__ never caches its return value (each access re-imports from the submodule), so patching src.data.loaders.azure_blob.AzureBlobEmailLoader in the new test correctly intercepts the lazy import inside load_emails. The long docstring on the test explains the reasoning; the approach is valid even if the target looks unusual compared to the sibling tests.

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Test coverage — good overall

The new test_load_emails_azure_blob_source covers the happy path with num_samples=None, including the dispatcher, the loader call, and the Document return. One assertion that could be added (not blocking): mock_normalized_email.to_document.assert_called_once_with(doc_id="azure_blob_0") would pin the doc-id construction logic f"{email.source}_{i}". The sibling enron/mail_archive_x tests also omit this, so it is a consistent gap rather than a regression.

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No security or injection concerns.