Github user mxm commented on a diff in the pull request:
https://github.com/apache/flink/pull/991#discussion_r37762004
--- Diff:
flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/functions/PrintSinkFunctionTest.java
---
@@ -0,0 +1,234 @@
+/*
+ * 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.api.functions;
+
+import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.JobID;
+import org.apache.flink.api.common.accumulators.Accumulator;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.core.fs.Path;
+import org.apache.flink.runtime.accumulators.AccumulatorRegistry;
+import org.apache.flink.runtime.broadcast.BroadcastVariableManager;
+import org.apache.flink.runtime.execution.Environment;
+import org.apache.flink.runtime.executiongraph.ExecutionAttemptID;
+import org.apache.flink.runtime.io.disk.iomanager.IOManager;
+import
org.apache.flink.runtime.io.network.api.writer.ResultPartitionWriter;
+import org.apache.flink.runtime.io.network.partition.consumer.InputGate;
+import org.apache.flink.runtime.jobgraph.JobVertexID;
+import org.apache.flink.runtime.jobgraph.tasks.InputSplitProvider;
+import org.apache.flink.runtime.memorymanager.MemoryManager;
+import org.apache.flink.runtime.state.StateHandle;
+import org.apache.flink.runtime.taskmanager.TaskManagerRuntimeInfo;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
+import org.apache.flink.streaming.runtime.tasks.StreamingRuntimeContext;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.Future;
+
+/**
+ * Tests for the {@link
org.apache.flink.streaming.api.functions.sink.PrintSinkFunction}.
+ */
+public class PrintSinkFunctionTest<IN> extends RichSinkFunction<IN> {
+
+ private Environment envForPrefixNull = new Environment() {
+ @Override
+ public JobID getJobID() {
+ return null;
+ }
+
+ @Override
+ public JobVertexID getJobVertexId() {
+ return null;
+ }
+
+ @Override
+ public ExecutionAttemptID getExecutionId() {
+ return null;
+ }
+
+ @Override
+ public Configuration getTaskConfiguration() {
+ return null;
+ }
+
+ @Override
+ public TaskManagerRuntimeInfo getTaskManagerInfo() {
+ return null;
+ }
+
+ @Override
+ public Configuration getJobConfiguration() {
+ return null;
+ }
+
+ @Override
+ public int getNumberOfSubtasks() {
+ return 0;
+ }
+
+ @Override
+ public int getIndexInSubtaskGroup() {
+ return 0;
+ }
+
+ @Override
+ public InputSplitProvider getInputSplitProvider() {
+ return null;
+ }
+
+ @Override
+ public IOManager getIOManager() {
+ return null;
+ }
+
+ @Override
+ public MemoryManager getMemoryManager() {
+ return null;
+ }
+
+ @Override
+ public String getTaskName() {
+ return null;
+ }
+
+ @Override
+ public String getTaskNameWithSubtasks() {
+ return null;
+ }
+
+ @Override
+ public ClassLoader getUserClassLoader() {
+ return null;
+ }
+
+ @Override
+ public Map<String, Future<Path>> getDistributedCacheEntries() {
+ return null;
+ }
+
+ @Override
+ public BroadcastVariableManager getBroadcastVariableManager() {
+ return null;
+ }
+
+ @Override
+ public AccumulatorRegistry getAccumulatorRegistry() {
+ return null;
+ }
+
+ @Override
+ public void acknowledgeCheckpoint(long checkpointId) {
+
+ }
+
+ @Override
+ public void acknowledgeCheckpoint(long checkpointId,
StateHandle<?> state) {
+
+ }
+
+ @Override
+ public ResultPartitionWriter getWriter(int index) {
+ return null;
+ }
+
+ @Override
+ public ResultPartitionWriter[] getAllWriters() {
+ return new ResultPartitionWriter[0];
+ }
+
+ @Override
+ public InputGate getInputGate(int index) {
+ return null;
+ }
+
+ @Override
+ public InputGate[] getAllInputGates() {
+ return new InputGate[0];
+ }
+ };
+
+ @Test
+ public void testPrintSinkStdOut(){
+
+ ExecutionConfig executionConfig = new ExecutionConfig();
+ final HashMap<String, Accumulator<?, ?>> accumulators = new
HashMap<String, Accumulator<?, ?>>();
+ final StreamingRuntimeContext ctx = new StreamingRuntimeContext(
+ "Test Print Sink",
+ this.envForPrefixNull,
+ null,
+ executionConfig,
+ null,
+ null,
+ accumulators
+ );
+
+ PrintSinkFunction<String> printSink = new
PrintSinkFunction<String>();
+ printSink.setRuntimeContext(ctx);
+ try {
+ printSink.open(new Configuration());
+ } catch (Exception e) {
+ e.printStackTrace();
+ }
+ printSink.setTargetToStandardOut();
+ printSink.invoke("hello world!");
+
+ assertEquals("Print to System.out", printSink.toString());
--- End diff --
You can replace stdout using `System.setOut(..)` by a `PrintStream` which
writes to a `ByteArrayOutputStream`.
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