Output incompatible with CircleCI UI

[camsaul]

The CircleCI UI only shows the first <failure> tag for each <testcase> (see https://discuss.circleci.com/t/junit-output-only-shows-first-failure-tag-in-a-testcase/40839) -- not sure if this is a bug with the CircleCI UI or just an undocumented expectation.

Should the official CircleCI test runner output each <failure> in its own <testcase>, so multiple failures in a single test will all show up in the CircleCI UI? (Assuming the current UI behavior is intentional, and not a bug. If this is in fact a bug with the UI, please close this issue.)

[camsaul]

Code in question is here https://github.com/circleci/circleci.test/blob/master/src/circleci/test/report/junit.clj#L53-L58