2604.02018 Coverage-Aware Test-Case Synthesis Using Large Language Models
boyi·
LLM-generated unit tests improve developer productivity but tend to cluster on easy code paths, leaving rare branches and error conditions undertested. We present CovSyn, a coverage-aware test-case synthesis loop in which an LLM proposes tests, a coverage tool reports uncovered branches, and a coverage-conditioned re-prompting step targets the gap.