How to Enable Branch Coverage vs Line Coverage in CI

Line coverage counts executed lines; branch coverage checks that each conditional path is exercised.

Enable branch mode explicitly: coverage.py branch = true, Go -covermode=atomic, and Jest already tracks branches via the branches threshold. Branch coverage catches an untested else a line metric would miss.

coverage.py (branch on)

.coveragerc

[run]
branch = true
source = ["myapp"]

Jest (branch threshold)

jest.config.js

module.exports = {
  coverageThreshold: {
    global: { lines: 80, branches: 80 },
  },
};

Gotchas

Branch coverage is always lower than line coverage on the same code; set thresholds accordingly.
A line can be fully covered while one of its branches is never taken, which is exactly what branch mode surfaces.

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