Bazel: How to exclude path from code coverage for Scala / Java?

Question

I am using Bazel with rules_scala. My problem now is how to exclude files from code coverage. So far this is how I am running coverage:

rm -rf coverage
bazel coverage --combined_report=lcov --coverage_report_generator="@bazel_tools//tools/test/CoverageOutputGenerator/java/com/google/devtools/coverageoutputgenerator:Main" ... 
genhtml -o coverage --ignore-errors source bazel-out/_coverage/_coverage_report.dat

But there are some folders I would like to exclude from code coverage. I tried using the --instrumentation_filter flag, but no matter what I tried putting there Bazel still collect coverage for this folder.

Are there any examples how I should use this flag?

Thanks!

Answer 1

Use

bazel coverage --combined_report=lcov --coverage_report_generator="@bazel_tools//tools/test/CoverageOutputGenerator/java/com/google/devtools/coverageoutputgenerator:Main" -- //... -//package/to/ignore/... 

Answer 2

This appears to be a bug with rules_scala. See this issue for more details.