Github user zentol commented on the issue:
https://github.com/apache/flink/pull/4233
WIth the existing surefire configuration we also cannot do this in 2 steps,
one for compilation and one for tests. It is not possible to only run tests
with any maven invocation that includes a life-cycle (i.e verify), which means
that you have to recompile some modules twice which isn't an option because
scala compilation is so utterly horrible.
You _could_ theoretically cd into each project after compilation and
directly invoke the surefire plugin, but this doesn't work as we have 2
executions (1 for unit tests, 1 for IT cases), and when invoking a plugin
directly you can at most run 1 execution and it has to be named either
"default-test" or "default-cli". This would be possible in maven 3.3.1, but we
can't use that without messing with the shading, We could use maven 3.3.X if we
split the repo and add a separate one for flink-dist, but that's not gonna
happen anytime soon.
We could directly invoke the surefire plugin if we merged our surefire
executions, but then we're still left with the problem of having to keep the
travis scripts in sync with the directory structure of the project.
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