test(router): cover configured mode lookup

[moe-berri]

TLDR

Problem this solves:

• Router coverage CI fails after fix(proxy): expose configured mode for auto-router models #39619
• get_configured_mode is only tested indirectly

How it solves it:

• Adds direct coverage for configured mode lookup
• Covers missing, malformed, and wildcard cases

User Flow

Before: a LiteLLM contributor sees the Router coverage check fail after merging #39619

1. They open the code-quality check for litellm_internal_staging
2. The Router coverage step fails and names get_configured_mode as untested

After: the same Router coverage check recognizes direct tests and passes

1. They open the code-quality check for this pull request
2. The Router coverage step reports untested_perc: 0.0

Relevant issues

Follow-up to #39619

Linear ticket

Pre-Submission checklist

• I have added meaningful tests
• The handful of test files covering my change pass locally, e.g. uv run pytest tests/test_litellm/<your_test_file>.py -v. Leave the suites (make test-unit-*, make test-unit) to CI: it finishes in ~15 minutes where a laptop takes an hour or more
• My PR passes all required CI/CD checks (e.g., lint, schema.d.ts sync check, etc.)
• My PR's scope is as isolated as possible; it only solves 1 specific problem
• I have received a Greptile Confidence Score of at least 4/5 before requesting a maintainer review (Greptile reviews automatically once the PR is opened; only comment @greptileai to re-request a review after pushing changes)

Delays in PR merge?

If you're seeing a delay in your PR being merged, ping the LiteLLM Team on Slack (#pr-review).

Screenshots / Proof of Fix

Before (828d561)

1. Run .venv/bin/python tests/code_coverage_tests/router_code_coverage.py
2. It raises Exception: 0.29% of functions in router.py are not tested: ['get_configured_mode']

After (a264c62)

1. Run .venv/bin/python tests/code_coverage_tests/router_code_coverage.py
2. It exits successfully with untested_perc: 0.0

Type

✅ Test

Caveats (if any)

Final Attestation

• The tests check the right things, including the edge cases, and regressions in the respective real-world customer use-cases are not possible after this PR

---

Note

Low Risk
Test-only changes with no production code modifications.

Overview
Adds direct unit tests for Router.get_configured_mode in test_router.py, addressing Router coverage CI that flagged the method as untested after #39619.

The new cases assert it returns deployment model_info.mode for a concrete model name, returns None for missing deployments or unset mode, does not invoke wildcard pattern routing (patched pattern_router.route), and treats non-string or blank/malformed mode values as absent.

^{Reviewed by Cursor Bugbot for commit a264c62. Bugbot is set up for automated code reviews on this repo. Configure here.}

[greptile-apps]

Greptile Summary

Adds direct unit coverage for configured Router mode lookup.

• Verifies configured, missing, unknown, malformed, and wildcard model cases.
• Confirms wildcard entries do not invoke pattern routing.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
tests/test_litellm/test_router.py	Adds isolated configured-mode lookup tests without introducing a new actionable issue.

_{Reviews (2): Last reviewed commit: "test(router): cover configured mode look..." | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[moe-berri]

bugbot run

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

^{Reviewed by Cursor Bugbot for commit a264c62. Configure here.}

[mateo-berri]

LGTM. Thanks!