connectivity: single JUnit report for concurrent run

[viktor-kurchenko]

Currently, if we run connectivity tests concurrently (using --test-concurrency flag) JUnit report will be created for each test namespace of K8S cluster.
I think it makes more sense to have a single JUnit report that collects all the data.

Run connectivity tests concurrently with JUnit report:

cilium connectivity test --test-concurrency=3 --junit-file report.xml

Single file JUnit report examples

[auriaave]

1. can you provide the steps to reproduce this issue? Example: a command run and the list of files generated.
2. can you provide an example of a single JUnit test where multiple tests run in sequence?
3. is the expectation of this bug report to generate a single XML file?
   a. if so, have we asked for feedback from the people that consume the generated reports?
   b. what approach would you recommend? sending the output of a concurrent test via a channel for all inputs to be written on a single file?
4. What would a single JUnit report file look like? Let's say 5 concurrent go-routines and some tests in one of the go-routines fails. Is the expectation that all tests will run and the single XML file will show the tests that failed? Or is it expected that as soon as a test fails (on any of the go-routines), no further tests will run?

Thank you!

[viktor-kurchenko]

@auriaave, thank you for your comments!

1. The description updated with command example
2. The description updated with single file JUnit reports
3. I think we can treat this issue as improvement. I don't have much context on how we use JUnit reports (probably @brlbil has).
4. It doesn't matter if test passes or fails, it just needs to be reflected in report (we should not change this logic).