Artem Fetishev e614367cbf tests: Initial version of integration tests (#7253) ... ### Describe Your Changes Related issue: #7199 This is the initial version of the integration tests for cluster. See `README.md` for details. Currently cluster only, but it can also be used for vm-single if needed. The code has been added to the apptest package that resides in the root directory of the VM codebase. This is done to exclude the integration tests from regular testing build targets because: - Most of the test variants do not apply to integration testing (such as pure or race). - The integtation tests may also be slow because each test must wait for 2 seconds so vmstorage flushes pending content). It may be okay when there are a few tests but when there is a 100 of them running tests will require much more time which will affect the developer wait time and CI workflows. - Finally, the integration tests may be flaky especially short term. An alternative approach would be placing apptest under app package and exclude apptest from packages under test, but that is not trivial. The integration tests rely on retrieving some application runtime info from the application logs, namely the application's host:port. Therefore some changes to lib/httpserver/httpserver.go were necessary, such as reporting the effective host:port instead the one from the flag. ### Checklist The following checks are **mandatory**: - [x] My change adheres [VictoriaMetrics contributing guidelines](https://docs.victoriametrics.com/contributing/). --------- Signed-off-by: Artem Fetishev <rtm@victoriametrics.com> (cherry picked from commit d7b3589dbd)		2024-10-30 15:22:22 +01:00
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multilevel_test.go	tests: Initial version of integration tests (#7253)	2024-10-30 15:22:22 +01:00
sharding_test.go	tests: Initial version of integration tests (#7253)	2024-10-30 15:22:22 +01:00