ci: use --cov=./litellm so coverage paths resolve unambiguously in Codecov

[yuneng-berri]

Summary

Switch --cov=litellm → --cov=./litellm in every CI invocation. --cov=<module-name> makes pytest-cov treat the argument as a Python package and emit XML paths relative to the package root (proxy/proxy_server.py), which strips the litellm/ prefix. Codecov then drops any path whose basename is ambiguous in the repo. --cov=<./path> treats the argument as a directory and emits repo-relative paths (litellm/proxy/proxy_server.py), which Codecov resolves unambiguously.

Why it matters

11 of the top-18 highest-fix-rate files have never appeared in Codecov despite being exercised by tests with coverage instrumentation:

File	Fix PRs (past 6 mo)	Before	After
litellm/proxy/proxy_server.py	133	missing	resolved
litellm/router.py	69	missing	resolved
litellm/proxy/utils.py	67	missing	resolved
litellm/litellm_core_utils/litellm_logging.py	62	missing	resolved
litellm/constants.py	61	missing	resolved
litellm/proxy/management_endpoints/key_management_endpoints.py	60	missing	resolved
litellm/utils.py	59	missing	resolved
litellm/main.py	55	missing	resolved
litellm/proxy/auth/user_api_key_auth.py	42	missing	resolved
litellm/proxy/management_endpoints/team_endpoints.py	37	missing	resolved
litellm/proxy/litellm_pre_call_utils.py	35	missing	resolved

All have ambiguous basenames in the repo (e.g. proxy_server.py exists 3 times under enterprise/ and litellm/proxy/; router.py exists twice under litellm/ and litellm/types/; utils.py, main.py each have 20+ copies across subpackages).

Files like _types.py (unique basename) were already resolving correctly, so the gap was invisible from looking at any single file.

How the fix was found

1. Downloaded a recent coverage.xml from a test-unit-proxy-db artifact and confirmed it contained filename="proxy/proxy_server.py" and filename="router.py" — paths stripped of the litellm/ prefix.
2. First tried codecov.yaml: fixes: ["::litellm/"] to prepend the prefix server-side. It was applied after Codecov's auto-resolution, double-prefixing every previously-working file to litellm/litellm/... while still dropping the ambiguous ones. Reverted.
3. Tested pytest-cov locally with multiple configs and confirmed that --cov=./litellm (path form, leading ./) makes coverage.py treat the argument as a directory and emit repo-relative paths.

Test plan

• Local: rerun tests/proxy_unit_tests/test_proxy_server.py with --cov=./litellm; verified coverage.xml emits filename="litellm/proxy/proxy_server.py", litellm/router.py, and litellm/types/router.py as distinct entries.
• Branch CI: pushed the change to this branch, which auto-triggers Unit Tests: Proxy DB Operations (its push: [main, "litellm_**"] trigger matches). Verified proxy_server.py and router.py appear under their proper litellm/... paths in Codecov for this branch's commit.
• (After merge) Confirm the next main merge commit shows proxy_server.py + siblings in Codecov.

Scope

• .github/workflows/_test-unit-base.yml (1)
• .github/workflows/_test-unit-services-base.yml (2)
• .github/workflows/test-mcp.yml (1)
• .circleci/config.yml (14)

[greptile-apps]

Greptile Summary

This PR fixes Codecov path resolution for the litellm package by switching --cov=litellm (module form) to --cov=./litellm (path form) in all 18 CI invocations across 4 config files. The module form causes pytest-cov to strip the litellm/ directory prefix from emitted paths (e.g., proxy/proxy_server.py), making Codecov unable to resolve files whose basenames are ambiguous in the repo; the path form produces full repo-relative paths (e.g., litellm/proxy/proxy_server.py) that Codecov can match unambiguously.

• .circleci/config.yml — 14 mechanical substitutions, one per CI job that uploads coverage; all updated consistently.
• .github/workflows/_test-unit-base.yml / _test-unit-services-base.yml — 3 substitutions across the shared base workflows (both branches of the if/else in the services base are covered).
• .github/workflows/test-mcp.yml — 1 substitution in the standalone MCP test step.

Confidence Score: 5/5

Pure CI tooling change with no production code modifications; all 18 occurrences are updated and no other workflow files contain the old form.

Every instance of --cov=litellm has been replaced with --cov=./litellm across all four affected files, with no missed occurrences in any other workflow. The change is mechanical and isolated to coverage reporting configuration; it does not affect test execution, build steps, or any runtime code. The PR description includes local verification that coverage.xml emits the expected repo-relative paths after the change.

No files require special attention.

Important Files Changed

Filename	Overview
.circleci/config.yml	14 occurrences of --cov=litellm replaced with --cov=./litellm to emit repo-relative paths in coverage.xml; changes are mechanical and consistent across all jobs.
.github/workflows/_test-unit-base.yml	Single --cov=litellm → --cov=./litellm replacement; base workflow used by all non-service unit test jobs.
.github/workflows/_test-unit-services-base.yml	Two --cov=litellm → --cov=./litellm replacements (one per branch of the if/else that controls parallelism); both branches updated correctly.
.github/workflows/test-mcp.yml	Single --cov=litellm → --cov=./litellm replacement in the MCP test run step.

_{Reviews (1): Last reviewed commit: "Merge remote-tracking branch 'origin/lit..." | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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