Factorio Coverage Tester

A coverage tool for Factorio Mods, by justarandomgeek.

Usage:

/startCoverage testname (Command)

Coverage.Start("testname") or remote.call("coverage","start","testname") (Script)

Start line counting for all participating mods. Each mod will collect data independently, to be gathered after tests complete.

/stopCoverage (Command)

Coverage.Stop() or remote.call("coverage","stop") (Script)

Stop line counting for all participating mods.

/reportCoverage (Command)

Coverage.Report() or remote.call("coverage","report") (Script)

Collect test data from all participating mods and write it out to script-outputs\lcov.info. Automatically stops counting if a test was still running.

Most scripts simply need to pcall(require,'__coverage__/coverage.lua') to be included in line counts. Scenarios/campaign scripts must also provide a path hint to translate "level" to a correct path:

CoverageLoaded,Coverage = pcall(require,'__coverage__/coverage.lua')
if CoverageLoaded then
    Coverage.LevelPath("modname","scenarios/scenarioname/")
end

This form is also useful to provide the Coverage object for Start()/Stop() API calls.

There is a mod setting to enable line counting immediately on control.lua initialization, but this is disabled by default because it makes starting a game very slow.