Github user yanghua commented on a diff in the pull request:
https://github.com/apache/flink/pull/6200#discussion_r199551693
--- Diff:
flink-connectors/flink-connector-pulsar/src/test/java/org/apache/flink/streaming/connectors/pulsar/PulsarConsumerSourceTests.java
---
@@ -0,0 +1,513 @@
+/*
+ * 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.streaming.connectors.pulsar;
+
+import org.apache.flink.api.common.functions.RuntimeContext;
+import org.apache.flink.api.common.serialization.SimpleStringSchema;
+import org.apache.flink.api.common.state.OperatorStateStore;
+import org.apache.flink.api.java.tuple.Tuple2;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.runtime.checkpoint.OperatorSubtaskState;
+import org.apache.flink.runtime.state.FunctionInitializationContext;
+import org.apache.flink.streaming.api.functions.source.SourceFunction;
+import org.apache.flink.streaming.api.operators.StreamSource;
+import org.apache.flink.streaming.api.operators.StreamingRuntimeContext;
+import org.apache.flink.streaming.api.watermark.Watermark;
+import org.apache.flink.streaming.util.AbstractStreamOperatorTestHarness;
+
+import org.apache.pulsar.client.api.Consumer;
+import org.apache.pulsar.client.api.ConsumerStats;
+import org.apache.pulsar.client.api.Message;
+import org.apache.pulsar.client.api.MessageId;
+import org.apache.pulsar.client.api.PulsarClient;
+import org.apache.pulsar.client.api.PulsarClientException;
+import org.apache.pulsar.client.api.Schema;
+import org.apache.pulsar.client.impl.MessageImpl;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.mockito.Matchers.any;
+
+/**
+ * Tests for the PulsarConsumerSource. The source supports two operation
modes.
+ * 1) At-least-once (when checkpointed) with Pulsar message
acknowledgements and the deduplication mechanism in
+ * {@link
org.apache.flink.streaming.api.functions.source.MessageAcknowledgingSourceBase}..
+ * 3) No strong delivery guarantees (without checkpointing) with Pulsar
acknowledging messages after
+ * after it receives x number of messages.
+ *
+ * <p>This tests assumes that the MessageIds are increasing monotonously.
That doesn't have to be the
+ * case. The MessageId is used to uniquely identify messages.
+ */
+public class PulsarConsumerSourceTests {
+
+ private PulsarConsumerSource<String> source;
+
+ private TestConsumer consumer;
+
+ private TestSourceContext context;
+
+ private Thread sourceThread;
+
+ private Exception exception;
--- End diff --
it is not necessary so many blank lines.
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