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In Go unit tests, the entire test output becomes the failure message because `go test` doesn't track why a test fails. This can make the failure message pretty large, in particular in integration tests. We cannot identify the real failure either because Kubernetes has no convention for how to format test failures. What we can do is recognize log output added by klog. prune-junit-xml now moves the full text to to the test output and only keep those lines in the failure which are not from klog. The klog output parsing might eventually get moved to k8s.io/logtools/logparse. For now it is developed as a sub-package of prune-junit-xml.