Hi everybody, as I've recently started contributing to Flink, I'd like to ask you a few tips on how you normally run the tests to ensure that everything runs smoothly before pushing the code to CI.
First, I'd like to point out two issues in particular I had: 1. some test suites (KMeansWithBroadcastSetITCase.java, ScalaCsvReaderWithPOJOITCase.scala and CsvReaderITCase.java) kept failing because the expected results (string literals) were matched against an object rendered as a string using the String.format method, a method whose result depends on the default Locale; as my Locale (Italian) renders doubles with a comma instead of a dot as the decimal separator, the representation of doubles diverged from the expected one, thus making my tests fail; I've solved it locally by explicitly using the US locale for those calls — I'm thinking about opening an issue and submitting my solution as a PR; 2. I had another problem with WebFrontendITCase.java: the test suite starts a mini cluster with the web server on port 8081; not knowing this and (unknowingly) having another process listening on that port, the test suite kept failing at initialization (line 59); however, the message regarding the port being busy was not displayed, despite being logged at ERROR level (WebMonitorUtils.startWebRuntimeMonitor, line 138); what configuration file should I edit in order for these issues to come up instantly without having to dig into the code to understand what's happening? Apart from these issues in particular, I'd like to ask if you have any particular routine when it comes to building and testing Flink locally. I'm not particularly knowledgable regarding Maven, so right now I'm basically running `mvn [clean] install [-rf :<last-failed-module>]` each time to make sure I have a fresh build to test. Would this be the right path or is there a quicker way to have a fresh build and running the tests on them? Feel free to point me to any relevant documentation, if you wish. Thank you in advance for any tip. :) -- BR, Stefano Baghino Software Engineer @ Radicalbit
