content: /*
   * 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.beam.examples;
  
  import java.io.IOException;
  import java.io.Serializable;
  import java.nio.channels.FileChannel;
  import java.nio.file.Files;
  import java.nio.file.StandardOpenOption;
  import java.util.Arrays;
  import org.apache.beam.sdk.extensions.gcp.options.GcsOptions;
  import org.apache.beam.sdk.extensions.gcp.util.GcsUtil;
  import org.apache.beam.sdk.extensions.gcp.util.gcsfs.GcsPath;
  import org.apache.beam.sdk.io.TextIO;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.Count;
  import org.apache.beam.sdk.transforms.Filter;
  import org.apache.beam.sdk.transforms.FlatMapElements;
  import org.apache.beam.sdk.transforms.MapElements;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.TypeDescriptors;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  import org.mockito.Mockito;
  
  /**
   * To keep {@link MinimalWordCount} simple, it is not factored or testable. This test file should be
   * maintained with a copy of its code for a basic smoke test.
   */
  @RunWith(JUnit4.class)
  public class MinimalWordCountTest implements Serializable {
  
    @Rule public TestPipeline p = TestPipeline.create().enableAbandonedNodeEnforcement(false);
  
    /** A basic smoke test that ensures there is no crash at pipeline construction time. */
    @Test
    public void testMinimalWordCount() throws Exception {
      p.getOptions().as(GcsOptions.class).setGcsUtil(buildMockGcsUtil());
  
      p.apply(TextIO.read().from("gs://apache-beam-samples/shakespeare/*"))
          .apply(
              FlatMapElements.into(TypeDescriptors.strings())
                  .via((String word) -> Arrays.asList(word.split("[^a-zA-Z']+"))))
          .apply(Filter.by((String word) -> !word.isEmpty()))
          .apply(Count.perElement())
          .apply(
              MapElements.into(TypeDescriptors.strings())
                  .via(
                      (KV<String, Long> wordCount) ->
                          wordCount.getKey() + ": " + wordCount.getValue()))
          .apply(TextIO.write().to("gs://your-output-bucket/and-output-prefix"));
    }
  
    private GcsUtil buildMockGcsUtil() throws IOException {
      GcsUtil mockGcsUtil = Mockito.mock(GcsUtil.class);
  
      // Any request to open gets a new bogus channel
      Mockito.when(mockGcsUtil.open(Mockito.any(GcsPath.class)))
          .then(
              invocation ->
                  FileChannel.open(
                      Files.createTempFile("channel-", ".tmp"),
                      StandardOpenOption.CREATE,
                      StandardOpenOption.DELETE_ON_CLOSE));
  
      // Any request for expansion returns a list containing the original GcsPath
      // This is required to pass validation that occurs in TextIO during apply()
      Mockito.when(mockGcsUtil.expand(Mockito.any(GcsPath.class)))
          .then(invocation -> ImmutableList.of((GcsPath) invocation.getArguments()[0]));
  
      return mockGcsUtil;
    }
  }
  