The recently added Digital twins Core live test pipeline has no code coverage.
https://dev.azure.com/azure-sdk/internal/_build?definitionId=2313
Add code coverage to the integration-test:node script by appending "nyc" to the script. See this issue for reference - #12935

To test this locally, check if there is this file generated where the package resides - /coverage/cobertura-coverage.xml
On Azure Devops, while running the live tests, make sure you have a Code Coverage tab show up after the live tests succeed and it matches the matrix where code coverage is shown for each file in the code - https://dev.azure.com/azure-sdk/internal/_build/results?buildId=793416&view=codecoverage-tab