To capture code coverage on your backend server, you need to run it using our Node.js test listener agent.

Unix:
./node_modules/.bin/npx slnodejs run --tokenfile ./path/to/sltoken.txt --buildsessionidfile buildSessionId [--labid <Lab ID>] --workspacepath "." --useinitialcolor true -- /your/backend/server/command 

Windows:
call .\node_modules\.bin\slnodejs run --tokenfile \path\to\sltoken.txt --buildsessionidfile buildSessionId [--labid <Lab ID>] --workspacepath "." --useinitialcolor true -- \your\backend\server\command 

...

Running backend server using SeaLights agent and preload.js

To run your backend service with Sealights without changing the startup command, use the preload.js file and the NODE_OPTIONS environment variable. This is a common practice in docker containers where the ENTRYPOINT cannot be modified.

• The agent contains a preload.js file under node_modules/slnodejs/lib/preload.js. You use it by setting the environment variable: NODE_OPTIONS="--require ./node_modules/slnodejs/lib/preload.js"

• In the current working directory, the agent will search for the token in the file sltoken.txt and the build session ID in the file buildSessionId.

• Other parameters can be passed to the agent using the following syntax: SL_ + {command line flag}. For instance, to pass the lab ID, you can set SL_labId=my_lab_id

Sample docker file:

ENV SL_labId=integ_test_otel
ENV NODE_OPTIONS="--require ./node_modules/slnodejs/lib/preload.js"

ENTRYPOINT [ "node", "--require", "./tracing.js", "index.js" ]