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.sdk.extensions.gcp.storage;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.contains;
  import static org.hamcrest.Matchers.instanceOf;
  import static org.junit.Assert.fail;
  
  import java.util.ServiceLoader;
  import org.apache.beam.sdk.io.FileSystem;
  import org.apache.beam.sdk.io.FileSystemRegistrar;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Lists;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link GcsFileSystemRegistrar}. */
  @RunWith(JUnit4.class)
  public class GcsFileSystemRegistrarTest {
  
    @Test
    public void testServiceLoader() {
      for (FileSystemRegistrar registrar :
          Lists.newArrayList(ServiceLoader.load(FileSystemRegistrar.class).iterator())) {
        if (registrar instanceof GcsFileSystemRegistrar) {
          Iterable<FileSystem<?>> fileSystems =
              registrar.fromOptions(PipelineOptionsFactory.create());
          assertThat(fileSystems, contains(instanceOf(GcsFileSystem.class)));
          return;
        }
      }
      fail("Expected to find " + GcsFileSystemRegistrar.class);
    }
  }
  