Github user hmcl commented on a diff in the pull request:
https://github.com/apache/storm/pull/1924#discussion_r99881564
--- Diff:
external/storm-kafka-client/src/test/java/org/apache/storm/kafka/spout/KafkaSpoutEmitTest.java
---
@@ -0,0 +1,156 @@
+/*
+ * Copyright 2017 The Apache Software Foundation.
+ *
+ * Licensed 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.storm.kafka.spout;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+import static org.mockito.Matchers.anyCollection;
+import static org.mockito.Matchers.anyLong;
+import static org.mockito.Matchers.anyObject;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.reset;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.common.TopicPartition;
+import
org.apache.storm.kafka.spout.builders.SingleTopicKafkaSpoutConfiguration;
+import org.apache.storm.kafka.spout.internal.KafkaConsumerFactory;
+import org.apache.storm.spout.SpoutOutputCollector;
+import org.apache.storm.task.TopologyContext;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.ArgumentCaptor;
+
+import static
org.apache.storm.kafka.spout.builders.SingleTopicKafkaSpoutConfiguration.getKafkaSpoutConfigBuilder;
+
+import org.apache.storm.utils.Time;
+import org.apache.storm.utils.Time.SimulatedTime;
+
+public class KafkaSpoutEmitTest {
+
+ private final long offsetCommitPeriodMs = 2_000;
+ private final TopologyContext contextMock =
mock(TopologyContext.class);
+ private final SpoutOutputCollector collectorMock =
mock(SpoutOutputCollector.class);
+ private final Map<String, Object> conf = new HashMap<>();
+ private final TopicPartition partition = new
TopicPartition(SingleTopicKafkaSpoutConfiguration.TOPIC, 1);
+ private KafkaConsumer<String, String> consumerMock;
+ private KafkaSpout<String, String> spout;
+ private KafkaSpoutConfig spoutConfig;
+
+ private void setupSpout() {
+ spoutConfig = getKafkaSpoutConfigBuilder(-1)
+ .setOffsetCommitPeriodMs(offsetCommitPeriodMs)
+ .build();
+
+ consumerMock = mock(KafkaConsumer.class);
+ KafkaConsumerFactory<String, String> consumerFactory =
(kafkaSpoutConfig) -> consumerMock;
+
+ //Set up a spout listening to 1 topic partition
+ spout = new KafkaSpout<>(spoutConfig)
+ .setKafkaConsumerFactory(consumerFactory);
+
+ spout.open(conf, contextMock, collectorMock);
+ spout.activate();
+
+ ArgumentCaptor<ConsumerRebalanceListener> rebalanceListenerCapture
= ArgumentCaptor.forClass(ConsumerRebalanceListener.class);
+ verify(consumerMock).subscribe(anyCollection(),
rebalanceListenerCapture.capture());
+
+ //Assign partitions to the spout
+ ConsumerRebalanceListener consumerRebalanceListener =
rebalanceListenerCapture.getValue();
+
consumerRebalanceListener.onPartitionsAssigned(Collections.singleton(partition));
+ }
+
+ @Test
+ public void shouldEmitAtMostOneMessagePerNextTupleCall() {
--- End diff --
I suggest for method name `testNextTuple_emitAtMostOneTuple`. Similar to
other methods, but it's up to you.
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