Merge Coverage Files generated using collectors integration

We’re suffering from the first issue mentioned here, we see 0% code coverage when running integration tests (The tests use the asp.net core WebApplicationFactory/testhost method for spinning up an in-memory web hostserver)

Example: dotnet test src\Project.IntegrationTests -c Release --no-build --logger:trx ^ --results-directory %testresults%/IntegrationTests ^ /p:CollectCoverage=true ^ /p:CoverletOutput=%testresults%\Coverage\ ^ /p:\"CoverletOutputFormat=cobertura,json\"

This sadly produces the 0% coverage on all lines/methods/classes etc as mentioned in the known issue document.

The suggested fix in the Known Issues document works a charm, using

dotnet test src\Project.IntegrationTests -c Release --no-build --logger:trx --results-directory %testresults%/IntegrationTests --collect:"XPlat Code Coverage"

Produces plenty of code coverage metrics as expected, and can see those when we feed the coverage.cobertura.xml file into reportgenerator.

However as far as I know, the above dotnet test ONLY produces test coverage data in the coverage.cobertura.xml format, which can’t be merged with coverage.coberatura.xml files from further test projects (e.g see this error).

Is there a way to achieve any of the following:

1. Have collect:"XPlat Code Coverage spit out JSON coverage data to merge future dotnet tests with?
2. Merge the coverage.cobertura.xml files instead? (n.b. we are also relying on the

   | Total | 100% | 100% | 100% | getting spat out in the console to ensure 100% coverage)

[nedgrady]

Thanks I’ll give that a real go, couldn’t seem to get the code coverage happening in proc the last time but will try with confidence this time.

Will close if no further issues

[MarcoRossignoli]

Closing for stale conversation, feel free to reopen if needed.