Using Suman with Node.js Code Coverage tools like Istanbul, NYC, etc.
To see coverage for one file, you can simply run:
istanbul cover your-test-file.js
or for coverage of multiple files and a conglomerated report you can run
suman --coverage <file/dir> <file/dir>
(You may need to run
$ suman --use-istanbul which will install istanbul for you.)
Suman will invoke Istanbul, and will cover each test in series, since Istanbul instrumentation is quite CPU instensive.
Suman will generate a consolidated report that represents the total coverage of your tests against your project.
This is a sketch of what you might do. Assuming all the entry points to your child processes are node.js files, instead of running node foo.js run istanbul cover foo.js --dir ./coverage/dir1 , istanbul cover foo2.js --dir ./coverage/dir2 and so on. If all your child processes exit cleanly, they should write a coverage.json file in each of those output directories.
We then run "istanbul report" to get a consolidated report of all the coverage files.
$ istanbul help cover and
$ istanbul help report to get an idea of all the options available.
Hope this helps. Let me know how it goes.