Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/6363#discussion_r203662639
--- Diff:
flink-runtime/src/test/java/org/apache/flink/runtime/io/network/netty/NettyLeakDetectionResource.java
---
@@ -0,0 +1,103 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.io.network.netty;
+
+import org.apache.flink.shaded.netty4.io.netty.util.ResourceLeakDetector;
+import
org.apache.flink.shaded.netty4.io.netty.util.ResourceLeakDetectorFactory;
+
+import org.junit.rules.ExternalResource;
+
+import javax.annotation.concurrent.GuardedBy;
+
+import static org.junit.Assert.fail;
+
+/**
+ * JUnit resource to fail with an assertion when Netty detects a resource
leak (only with
+ * <tt>ERROR</tt> logging enabled for
+ *
<tt>org.apache.flink.shaded.netty4.io.netty.util.ResourceLeakDetector</tt>).
--- End diff --
Would it be possible to check for this condition by doing something like
this in `@Before`?
```
Assert.assertTrue(LoggerFactory.getLogger(org.apache.flink.shaded.netty4.io.netty.util.ResourceLeakDetector.class).isErrorEnabled());
```
```
---
