Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/5933#discussion_r184928993
--- Diff:
flink-test-utils-parent/flink-test-utils/src/main/java/org/apache/flink/test/util/MiniClusterResource.java
---
@@ -137,6 +142,7 @@ public int getWebUIPort() {
@Override
public void before() throws Exception {
+ temporaryFolder.create();
--- End diff --
could be necessary if the `@Rule` annotation doesn't work in arbitrary
(i..e. non-test) classes. Then we have to manage it manually, with `create()`
and `before()`.
---
