Feature Request: support `xccov` JSON format

[eelco]

For a while now (since Xcode 9.3) Apple ships a tool for code coverage. (Run it with xcrun xccov).

It can read the coverage files generated by Xcode and translate them into JSON.

It would be great if the test reporter could support those JSON files, as it would save a bunch of dependencies for getting Objective-C / Swift coverage into Code Climate.

[wfleming]

Good idea! Our team probably won't be able to incorporate this into our own planning in the near-term, so I've added the "help wanted" label here. This would be great to see as a PR if anyone has time.

[andresilveirah]

Sorry for the digging this issue out of the grave but has this perhaps been addressed on #399 ? And could anyone point me to the doc on how to use it?

[manicmaniac]

I also cannot find the document but it worked as I expected.

$ xcodebuild test -resultBundlePath result_bundle.xcresult
$ xcrun xccov view --report --json result_bundle.xcresult > coverage.json
$ cc-test-reporter format-coverage -t xccov coverage.json