Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/1394#discussion_r45733750
--- Diff:
flink-runtime/src/test/java/org/apache/flink/runtime/blob/BlobServerRangeTest.java
---
@@ -0,0 +1,108 @@
+/*
+ * 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.blob;
+
+import org.apache.flink.configuration.ConfigConstants;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.util.NetUtils;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+
+/**
+ * Tests to ensure that the BlobServer properly starts on a specified
range of available ports.
+ */
+public class BlobServerRangeTest {
+
+
+ /**
+ * Start blob server on 0 = pick an ephemeral port
+ */
+ @Test
+ public void testOnEphemeralPort() {
+ Configuration conf = new Configuration();
+ conf.setString(ConfigConstants.BLOB_SERVER_PORT, "0");
+ try {
+ BlobServer srv = new BlobServer(conf);
+ } catch (IOException e) {
--- End diff --
Why don't you let the exception propagate. This will be enough to fail the
test and you will see the stack trace at the proper position.
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