Definition
Test coverage is a quantitative metric that indicates how much of a codebase is exercised by an automated test suite. In blockchain and smart contract development, it measures the proportion of contract logic, functions, or code branches that are executed during tests. Higher test coverage reflects broader verification of the implemented behavior but does not, by itself, guarantee correctness or security.
In Simple Terms
Test coverage is a number that shows how much of the code is actually run when tests are executed. For smart contracts, it tells how many parts of the contract code are touched by tests, helping teams see which areas are checked by automated tests and which areas remain untested.
Context and Usage
In blockchain projects, test coverage is commonly reported during development, continuous integration, and security review of smart contracts. It appears in testing reports, security audit summaries, and quality metrics dashboards. Teams use it to assess the thoroughness of their automated testing around contract logic, especially before activities like security audits, bug bounty launches, or deploying upgradeable contracts.