test: cover build config-settings and missing backend warning

[Shriprasad-P]

Pull Request Check List

Relates-to: #3155

• Added tests for changed code.
• Updated documentation for changed code. (not applicable, test-only change)

Summary

• Cover the CLI --config-settings local-version=... path end-to-end, including artifact naming and successful exit.
• Assert the existing --local-version deprecation warning.
• Assert the No build backend defined warning for projects without a build system/backend.

Why

Issue #3155 still lists poetry build as an outstanding test area. The command already has strong line coverage, so this PR focuses on previously unasserted behavior rather than adding redundant execution-only tests.

Testing

• poetry run pytest tests/console/commands/test_build.py -q -n0
• poetry run ruff check tests/console/commands/test_build.py
• poetry run ruff format --check tests/console/commands/test_build.py
• poetry run mypy tests/console/commands/test_build.py
• poetry run pre-commit run --files tests/console/commands/test_build.py

AI assistance

Cursor Agent assisted with repository inspection, identifying the coverage gaps, drafting the tests, and running validation. The contributor reviewed the complete diff and test results before publication.

[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• The two local version tests share quite a bit of setup and assertions; consider parametrizing them or extracting a small helper to reduce duplication and make it easier to extend behavior later.
• The tests for _requires_isolated_build and the no-backend warning are directly calling a private method; if feasible, prefer asserting the behavior via the public build command interface to keep tests resilient to internal refactors.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The two local version tests share quite a bit of setup and assertions; consider parametrizing them or extracting a small helper to reduce duplication and make it easier to extend behavior later.
- The tests for `_requires_isolated_build` and the no-backend warning are directly calling a private method; if feasible, prefer asserting the behavior via the public build command interface to keep tests resilient to internal refactors.

## Individual Comments

### Comment 1
<location path="tests/console/commands/test_build.py" line_range="108-116" />
<code_context>
+        tmp_tester.execute(f"--config-settings local-version={local_version_label}")
+        == 0
+    )
+    build_artifacts = tuple(
+        (tmp_project_path / "dist").glob(
+            get_package_glob(tmp_poetry, local_version=local_version_label)
+        )
+    )
+
+    assert len(build_artifacts) > 0
+    assert all(archive.exists() for archive in build_artifacts)
+    assert "`--local-version` is deprecated." not in tmp_tester.io.fetch_error()


</code_context>
<issue_to_address>
**suggestion (testing):** Strengthen `--config-settings local-version` coverage by asserting artifact names include the local version label

This test currently only verifies that some artifacts exist for the glob from `get_package_glob`, but not that the local version label is actually present in their filenames. If `get_package_glob` became too permissive, the test could still pass while ignoring the local version. Please add an assertion (e.g. `assert all(local_version_label in archive.name for archive in build_artifacts)`) to directly verify artifact naming and better protect against regressions.

Suggested implementation:

```python
    assert len(build_artifacts) > 0
    assert all(archive.exists() for archive in build_artifacts)
    assert all(local_version_label in archive.name for archive in build_artifacts)
    assert "`--local-version` is deprecated." in tmp_tester.io.fetch_error()

```

This change assumes:
1. `build_artifacts` is defined earlier in `test_build_with_config_settings_local_version` as an iterable of artifact paths.
2. `local_version_label` is the string used in the `--config-settings local-version=...` invocation.
If either name differs in your actual file, please adjust the assertion to match the existing variable names.
</issue_to_address>

---

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[sourcery-ai]

Sourcery assessment

Approved.