Github user zentol commented on the issue:
https://github.com/apache/flink/pull/2063
when we have more data than expected, remove() will be called on an empty
list and should throw an exception, no?
if you want to execute the python tests you only have to call mvn verify on
the flink-python package.
```
cd flink-libraries/flink-python
mvn verify
```
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