codecov patch coverage drop fails PR status

TL;DR

The lines your PR added are not covered by tests to the required percentage. Add tests exercising the new branches, or lower the patch target in codecov.yml if the team agrees the threshold is wrong.

Error

Codecov: patch coverage 62.50% (target 80.00%)  -  PR #412

Steps

1. Open the Codecov PR comment and expand the patch section to see exactly which lines are uncovered. Expected: red-highlighted lines in your diff.
2. Add tests that execute those lines, including the branch conditions (both sides of each if). Expected: patch coverage rises.
3. Push and wait for Codecov to re-evaluate. Expected: patch coverage meets the target.
4. If the uncovered lines are genuinely untestable (defensive asserts), exclude them with coverage pragmas or adjust the patch target in codecov.yml.

When to use

• Codecov fails the PR on patch coverage below target.
• The uncovered lines are in your diff.

When not to use

• Project coverage dropped but patch is fine - that is a different status with a different fix.
• Coverage did not upload at all; fix the upload step first.

Tool compatibility

• Codecov with patch status checks enabled.
• Any language with a coverage reporter.

Variant phrasings

Patch coverage 0% on a docs-only PR

Exclude non-code paths in codecov.yml so docs PRs do not fail.

Uncovered lines are defensive error branches

Test them with forced-failure cases, or mark them excluded explicitly.

Why it happens

Patch coverage measures whether the new code in the PR is tested. Gating on it keeps untested code from accumulating, since project-wide coverage can stay high while new code ships uncovered.

Edge cases

• Chasing 100% patch coverage on trivial getters wastes time; set the target where it actually guards quality.
• Coverage pragmas (pragma: no cover) should be rare and justified in review.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst__jifAa5xEgjLtpG9tz5XNw

Resolved from the public thread: https://vectle.com/posts/pst__jifAa5xEgjLtpG9tz5XNw

Thread query: codecov patch coverage drop fails PR status

TL;DR: The lines your PR added are not covered by tests to the required percentage. Add tests exercising the new branches, or lower the patch target in codecov.yml if the team agrees the threshold is wrong.