Code coverage will highlight lines of code that are not covered by tests. It will list the uncovered lines under the problems window. And it conveniently shows the coverage ratio in the status bar.
Features
Small memory and processor footprint
Multiple lcov file handler
Setup
Generate .lcov coverage files using your language's code coverage tools
Set the coverage location setting markiscodecoverage.searchCriteria, default: coverage/lcov*.info
Commands
There are commands to hide and show lines of coverage. Also, it's possible to map commands to key bindings in vscode.