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Previously it was possible to redirect the pub run test -r json output to a file and than parse the json file accordingly (ex. pub run test -r json > test_results.json). Now pub run build_runner test -- -r json cannot be redirected to a file because of the build output. A possible solution would be to provide an --output argument for build_runner test which pipes the test output to the file.

Makes sense, we already have a --output flag but we could add a --test-output flag or similar (although that might be confusing as it would have a totally different meaning than --output).

Note that there is a workaround today, you can do pub run build_runner build test -o <output-dir>, and then pub run test -r json --precompiled <output-dir>.

Some other options could be:

• Adding a flag to silence the build output entirely
• Adding a json reporter mode to the build process as well

Long-er term I imagine you'll want a JSON reporter for other reasons (IDE integration, etc).

We have some other ideas coming down the line which would be relevant as well when it comes to tool integration, so we might want to hold off on a full json reporter. Possibly something like this https://jvican.github.io/slides/BSP.pdf (or maybe just implement that with some language extensions).

I took a stab at fixing this issue here: https://github.com/dart-lang/build/pull/2508

I'm not sure if there are still plans for a full json reporter as mentioned above, but this would at least make it possible to get a usable json test report with a single build_runner command.

The test package supports --file-reporter now, which I think can be used to accomplish this